June 2019最新文献

筛选
英文 中文
Selection for salinity tolerance in an international rice collection at vegetative stage 一个国际水稻品种营养期耐盐性的选择
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1327
Leila Nayyeripasand, G. Garosi, A. Ahmadikhah
{"title":"Selection for salinity tolerance in an international rice collection at vegetative stage","authors":"Leila Nayyeripasand, G. Garosi, A. Ahmadikhah","doi":"10.21475/AJCS.19.13.06.P1327","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1327","url":null,"abstract":"Water and soil salinity as the main abiotic stresses decrease crop yield and restrict the use of agricultural lands. In order to assess salt stress effect on seedling growth of rice and to select more tolerant rice genotypes, a factorial experiment was performed at two levels of NaCl namely non-stress (EC 1.2 dS m−1) and salt-stress (EC 10 dS m−1) in hydroponics with an international rice collection consisted of 155 varieties. Seven stress tolerance indices including STI, SSI, HM, RDI, SSPI, ATI and TOL were used to identify salt tolerant genotypes. The results of variance analysis showed that the effect of genotypes (G), Salt treatment (T) and G×T interaction were significant for all investigated traits (except for the effect of genotypes on shoot length). Under salt stress most genotypes showed similar trend of salt response, i.e. reduction in all traits. The results also revealed that dry weight (DW) was less affected than fresh weight (FW), and the shoot weight (SW) was affected more than the root weight (RW), indicating that shoot growth is more sensitive than root growth to salt stress. The Na+, K+ and Na+:K+ ratio were increased more than 713%, reduced 22% and increased more than 996% under salt stress, respectively. Four stress tolerance indices including MP, HM, GMP and STI showed highest correlation with each other and also with plant performance (Z-scores) under both normal and stress conditions; thus each of these indices can be used as the suitable indicators for screening salt tolerant genotypes. Based on the results, genotypes #84, #30 and #48 showed the highest performance and STI under salinity condition, so they have considerable potential to improve salt tolerance in rice breeding programs. In addition, genotypes #178, #198 and #6 with the lowest values of STI were found to be intolerant genotypes to salt stress.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127476900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Cultivation of low tetrahydrocannabinol (THC) Cannabis sativa L. cultivation in Victoria, Australia: Do we know enough? 在澳大利亚维多利亚州种植低四氢大麻酚(THC)大麻:我们知道的足够吗?
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1669
Talia Humphries, S. Florentine
{"title":"Cultivation of low tetrahydrocannabinol (THC) Cannabis sativa L. cultivation in Victoria, Australia: Do we know enough?","authors":"Talia Humphries, S. Florentine","doi":"10.21475/AJCS.19.13.06.P1669","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1669","url":null,"abstract":"Late 2017, the ban on the cultivation and consumption of low tetrahydrocannabinol (THC) Cannabis sativa L. in Victoria, was lifted by the Federal Government of Australia. Its legalization presents the opportunity for Victoria to become a leading producer and distributer of these economically valuable hemp products. However, as a novel crop to Victoria, there is little information available for obtaining economically viable yields. Therefore, the objectives of this review were to firstly, develop an understanding of the environmental requirements shared by C. sativa cultivars, and what conditions promote fibre and grain yields. Secondly, it seeks to identify what farming practices have been conducted throughout Europe, Canada and China, and to explore whether these practices could be adapted to Victoria. Thirdly, the review will assist in making recommendations regarding which cultivars would be ‘potential’ candidates for commencing trials under Victorian climates so to find out the varieties that can provide high yields for fibre, grain and dual-purpose production. This review notes that Victoria shares a similar climate to central Europe, and has an ideal climate for the development of a successful hemp industry, as it has suitable lengths of daylight throughout spring and summer months and meets the precipitation requirements. This review has thus strongly suggested that the properties and attributes of European varieties of C. sativa should be further researched for site-specific cultivation in Victoria for fibre, grain and dual-purpose production in order to maximise harvest yields.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123048021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Evaluation of agronomic traits and assessment of genetic variability in some popular wheat genotypes cultivated in Saudi Arabia 沙特阿拉伯栽培的几种常用小麦基因型的农艺性状评价和遗传变异评估
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1329
S. Al-Otayk
{"title":"Evaluation of agronomic traits and assessment of genetic variability in some popular wheat genotypes cultivated in Saudi Arabia","authors":"S. Al-Otayk","doi":"10.21475/AJCS.19.13.06.P1329","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1329","url":null,"abstract":"The present study was carried out to evaluate agronomic traits and assessment of genetic variability of some wheat genotypes at Qassim region, Saudi Arabia', during 2010/11 and2011/12 seasons. Fourteen wheat genotypes including five bread wheat and nine durum wheat genotypes were evaluated in randomized complete block design with three replications. The genotypes were evaluated for ten different yield contributing characters viz., days to heading, days to maturity, grain filling period, grain filling rate, plant height, number of spikes m-2, kernels spike-1, 1000-kernel weight, grain yield and straw yield. The combined analysis of variance indicated the presence of significant differences between years for most characters. The genotypes exhibited significant variation for all the characters studied indicating considerable amount of variation among genotypes for each character. Maximum coefficient of variation was observed for number of spikes m-2 (17%), while minimum value was found for days to maturity. Four genotypes produced maximum grain yield and statistically similar, out of them two bread wheat genotypes (AC-3 and SD12) and the other two were durum wheat (AC-5 and BS-1). The genotypes AC-3, AC-5 and BS-1 had higher grain yield and stable in performance across seasons. The estimation of phenotypic coefficient of variation in all the traits studied was greater than those of the genotypic coefficient of variation. High heritability estimates (> 0.5) were observed for days to heading, days to maturity, and plant height, while the other characters recorded low to moderate heritability. The high GA % for plant height and days to heading (day) was accompanied by high heritability estimates, which indicated that heritability is mainly due to genetic variance. Comparatively high expected genetic advances were observed for grain yield components such as number of kernels spike-1 and 1000-kernel weight. Grain yield had the low heritability estimate with a relatively intermediate value for expected genetic advance. The results of principle component analysis (PCA) indicated that the superior durum wheat genotypes for grain yield in the two seasons (AC-5 and BS-1) are clustered in group II (Fig. 2). Also, the superior two bread wheat genotypes (AC-3 and SD12) were in group I. Therefore, it could be future breeding program to develop new high yielding genotypes in bread and durum wheat.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116620992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Effect of tear/crack on soybean (Glycine max) seed coat, physiological quality and pathology of the seed 撕裂对大豆种皮、种子生理品质和病理学的影响
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1780
Bruna Ribeiro Machado, C. C. O. Pereira, Élida Priscila Bogéa Carvalho, Juliana Oliveira da Silva, Letícia de Maria Oliveira Mendes, Milton Luiz da Paz Lima, Jakelinny Martins Silva, I. D. Menezes
{"title":"Effect of tear/crack on soybean (Glycine max) seed coat, physiological quality and pathology of the seed","authors":"Bruna Ribeiro Machado, C. C. O. Pereira, Élida Priscila Bogéa Carvalho, Juliana Oliveira da Silva, Letícia de Maria Oliveira Mendes, Milton Luiz da Paz Lima, Jakelinny Martins Silva, I. D. Menezes","doi":"10.21475/AJCS.19.13.06.P1780","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1780","url":null,"abstract":"Seed coat tear is frequently occurs in some soybean cultivars. The impact of seed coat tear on seed physiology and sanitation is uncertain. Our objective was to analyze the physiological and pathological effect of tear on soybean (Glycine max) seed coat. The cultivars NS-8338-IPRO (with high incidence of tear) and NS-6906-IPRO (with low incidence of tear) were used. A tetrazolium test was used to assess the physiological quality of the seed coat before and after storage. The sanitary quality was assessed through the \"Blotter Test\". For each storage period, we evaluated seeds with 0% coat tear, up to 10%, and above 10%. The experiment was performed in a completely randomized design using the methodologies proposed by RAS. The coat tear on soybean seed positively contributed to the moisture damage affecting the inner part of the seed. Incidences of Fusarium sp. and Aspergillus sp. were frequently observed in torn seeds and in seeds without tear (around 9-10%) but did not interfere with seed quality. The appearance of coat tear on soybean seed is increased by moisture damage and do not serve as a gateway for the fungi to cause damage during seed emergence.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115457466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Response surface methodology optimization of oil extraction from oil palm meal (OPM) with hydrous ethanol and its pilot-scale application with recirculation of extraction solvent 响应面法优化含水乙醇提取油棕粕的工艺及溶剂循环的中试应用
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1705
Krit Somnuk, Jarernporn Thawornprasert, P. Chanjula, G. Prateepchaikul
{"title":"Response surface methodology optimization of oil extraction from oil palm meal (OPM) with hydrous ethanol and its pilot-scale application with recirculation of extraction solvent","authors":"Krit Somnuk, Jarernporn Thawornprasert, P. Chanjula, G. Prateepchaikul","doi":"10.21475/AJCS.19.13.06.P1705","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1705","url":null,"abstract":"In the small-scale dry oil extraction from palm fruit used by palm oil mills, mixed crude palm oil (MCPO) is extracted using a single screw press. The oil palm meal (OPM) by-product can be used as alternative feed for ruminants. Three parameters in further solvent extraction of oil are the ethanol-to-dried oil palm meal (DOPM) ratio (4.9–30.1 g.g-1), the extraction time (0.2–18.8 min), and the speed of stirrer (48–552 rpm). These parameters were optimized to for maximum oil yield by response surface methodology (RSM) while employing hydrous ethanol as the solvent. In our laboratory-scale oil extraction, the maximal experimental yield was 10.27 wt.% under the recommend condition: 20.1 g.g-1 ethanol-to-DOPM ratio, 11 min extraction time, and 300 rpm speed of stirrer. Moreover, prototype-scale oil extraction was tested with recirculated miscella for effects of the number of cycles on oil extraction from fresh DOPM. The results showed approximately 17.4 wt.% oil yield from 5000 g DOPM at the conditions recommended based on laboratory-scale experiments. In this study, recirculated miscella was used to extract oil from fresh DOPM. The first four cycles of oil extraction were almost as efficient as with fresh ethanol. Moreover, the protein content in the defatted oil palm meal (DFOPM) improved with oil extraction, because residual oil in DOPM was removed. The DFOPM should have less rancidity and longer shelf-life than DOPM.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131615555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Effect of different proportions of urban organic compost on Conilon coffee (Coffea canephora) propagation 不同比例城市有机堆肥对康尼隆咖啡(Coffea canephora)繁殖的影响
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1313
W. Z. Quartezani, Ramon Amaro de Sales, T. A. Pletsch, S. S. Berilli, Euzileni Mantoanelli, L. R. Hell, E. C. D. Oliveira, F. L. Neves, J. C. L. Neves
{"title":"Effect of different proportions of urban organic compost on Conilon coffee (Coffea canephora) propagation","authors":"W. Z. Quartezani, Ramon Amaro de Sales, T. A. Pletsch, S. S. Berilli, Euzileni Mantoanelli, L. R. Hell, E. C. D. Oliveira, F. L. Neves, J. C. L. Neves","doi":"10.21475/AJCS.19.13.06.P1313","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1313","url":null,"abstract":"Brazil is the largest producer of Conilon coffee (Coffea canephora) in the world. The use of organic matter in substrates for clonal plant propagation is essential to promote favorable conditions for the development of both shoots and roots. Therefore, it is important for production systems to test new sources of organic matter such as solid urban waste. The objective of this study was to evaluate the effect of different proportions of composted urban waste on the propagation of Conilon coffee plants. The experiment was arranged in a randomized block design, with five replications and seven treatments. The treatments consisted of different proportions of composted urban waste (0, 15, 30, 50, 70, 90 and 100%), and biometric and quality characteristics of the clonal plants were evaluated. The results showed that proportions of composted urban waste higher than 50% added to the soil substrate promoted the highest plant growth rates, and even the lowest proportion of organic matter (15%) showed better results for all characteristics than the treatment without organic matter.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121250875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Evaluation of vitamin C, nitrate and chlorophyll content determined in lettuce (Thaís, Vanda, Verônica) cultivated in hydroponic system using wastewater 废水水培莴苣(Thaís, Vanda, Verônica)中维生素C、硝酸盐和叶绿素含量的评价
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1682
J. D. F. Xavier, C. Azevedo, M. R. D. Q. A. Azevedo, J. D. S. Mendes, J. D. Fernandes, Antonio Fernandes Monteiro Filho
{"title":"Evaluation of vitamin C, nitrate and chlorophyll content determined in lettuce (Thaís, Vanda, Verônica) cultivated in hydroponic system using wastewater","authors":"J. D. F. Xavier, C. Azevedo, M. R. D. Q. A. Azevedo, J. D. S. Mendes, J. D. Fernandes, Antonio Fernandes Monteiro Filho","doi":"10.21475/AJCS.19.13.06.P1682","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1682","url":null,"abstract":"The objective of this work was to determine the levels of vitamin C, nitrate and chlorophyll in three lettuce cultivars in a hydroponic system using waste- and well-water. The experiment was conducted in a hydroponic system using laminar flow technique and nutrients in a protected environment. The experimental design was randomized blocks with treatments set up in split-plots with three replications, whose main plots devoted to lettuce cultivars and sub-plots to hydroponic solutions. The experimental solutions consisted of 7 nutrients (S): S1=Furlani solution, S2=domestic wastewater, S3=optimized domestic wastewater, S4 =well water S5 =optimized well water; S6 = reactor wastewater solution and S7 =optimized reactor wastewater solution and the subplot for the three cultivars of iceberg lettuce (Verônica, Vanda, and Thais). The following variables were determined: nitrate, vitamin C and chlorophyll content using the method described by Lichtenthaler. The results indicated that highest content of vitamin C was found in the Vanda cultivar using the S1 solution. For Veronica cultivar, the highest levels of vitamin C were observed at solutions S1, S2, S3, S4, and S7. The solutions S2 and S3 did not differ from one another in all three cultivars. For the Vanda cultivar, solutions S1, S4 and S7 were the ones that promoted the highest levels of nitrate, 4.61; 3, 32 and 2.64 g kg-1, respectively. Evaluating the effect of the solution within the cultivars, we verified that the highest nitrate values obtained from S2 nutrition for cultivars Thais and Verônica. Regarding the S5 solution, the Verônica cultivar presented the highest concentration of this nutrient. The cultivate Thaís, the highest contents of chlorophyll b were found in solutions S7, S6, S4, S3 and S2, where they did not differ significantly. Regarding to Vanda cultivar the highest values of chlorophyll b were present in solutions S2 and S5. The Verônica cultivar independent of the solution used presented the same values of this pigment.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130351270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Bioecology of Anastrepha alveata Stone (Diptera: Tephritidae) associated with wild plum fruits Ximenia americana L. (Olacaceae) 野生梅果美洲西梅科(野李子科)伴生叶蝉(双翅目:蝗科)的生物生态学研究
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1959
Almerinda Amélia Rodrigues Araújo, R. Lemos, J. H. R. Araujo, Paulo Roberto Ramalho Silva, S. França, Clarice D. A. Corsato, Janaína M Mondego, Gislane DA Silva Lopes
{"title":"Bioecology of Anastrepha alveata Stone (Diptera: Tephritidae) associated with wild plum fruits Ximenia americana L. (Olacaceae)","authors":"Almerinda Amélia Rodrigues Araújo, R. Lemos, J. H. R. Araujo, Paulo Roberto Ramalho Silva, S. França, Clarice D. A. Corsato, Janaína M Mondego, Gislane DA Silva Lopes","doi":"10.21475/AJCS.19.13.06.P1959","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1959","url":null,"abstract":"Fruit flies (Diptera: Tephritidae) are considered important pests of fruticulture due to considerable losses to production and limitation to free transit of fresh fruits. A generalist species is cresature that can live or feed on a wide variety of environemnts or host plants. Although, Anastrepha is a generalist species but infests a small range of plants. The specificity of this species with host plants is a peculiar characteristic of genus Anastrepha. Therefore, it is important to understand the host species and its feeding behaviour on host plants. This way, we will better know its ecology, biology and evolution for rational control ways and measures. Therefore, this study aimed at understanding the biology of Anastrepha alveata Stone (Diptera: Tephritidae). A study was carried out under controlled laboratory conditions (27 ± 2°C temperature, 70 ± 5% RH, photoperiod 12 hours) during the period from November/2015 to October/2017. Anastrepha alveata adults were obtained from wild plum fruits Ximenia americana L. (Olacaceae), collected from Savanna area in two fructification periods. One-hundred and fifty Anastrepha alveata adults were collected (60 females and 90 males) to determine sexual maturity, mating behavior, fecundity and longevity. The sexual maturity for Anastrepha alveata was 8-13 days after emergence for females. At this age they emitted signal of acceptance for mating and copulation. For males, 5-7 days after emergence this mating signals was given, which was characterized by the protrusion of the lateral abdominal pleural glands. The mating rhythm of Anastrepha alveata was crepuscular/nocturnal, beginning around 6 p.m. and extending to/after 9 p.m. Anastrepha alveata females did not mate with more than one male but mated more than once. The number of males did not affect significantly the mating time, the number of eggs and the longevity of Anastrepha alveata. The mean pupal period for Anastrepha alveata was 17.5 days. Two preferential peaks for adult emergence were observed at 10:00 am and 03:00 pm. The longevity of the adult insects was greater than 300 days, surviving until the fructification of its host (wild plum) in the following year. Therefore, A. alveata has a strictly monophagous food habit associated with the Ximenia americana host.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127092549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Evaluation of antagonistic activities against Pythium myriotylum and plant growth promoting traits of Streptomyces isolated from Cocoyam (Xanthosoma sagittifolium (L.) Schott) rhizosphere 黄豆链霉菌对粟圆霉的拮抗活性及促生性状评价Schott)根际
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1670
Peguy Flora Djuidje Kouomou, C. Ewané, S. Lerat, D. O. Ndoumou, C. Beaulieu, T. Boudjeko
{"title":"Evaluation of antagonistic activities against Pythium myriotylum and plant growth promoting traits of Streptomyces isolated from Cocoyam (Xanthosoma sagittifolium (L.) Schott) rhizosphere","authors":"Peguy Flora Djuidje Kouomou, C. Ewané, S. Lerat, D. O. Ndoumou, C. Beaulieu, T. Boudjeko","doi":"10.21475/AJCS.19.13.06.P1670","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1670","url":null,"abstract":"The focus of this study was to isolate, evaluate and characterize cocoyam rhizospheric actinobacteria collected from Mount Cameroon for their potential antagonistic activities against Pythium myriotylum, the causative agent of cocoyam root rot disease, and/or their ability to promote plant growth. Actinobacteria were isolated from soil samples by using serial dilution method. Dual culture assay was used to screen the isolates against fungal phytopathogens including P. myriotylum. The selected isolates were characterized morphologically, physiologically, biochemically and genetically. Furthermore, these isolates were subjected to in vitro production of various plant growth promoting (PGP) traits. Among the 287 isolates distributed into 12 distinct groups, PFK4, PFBOT7 and PFEL2 had high antagonistic effects against P. myriotylum and they were regarded as promising candidates for further study of their biocontrol ability. The identification of actinobacterial isolates was done using universal PCR of partial 16S rRNA sequences combined with bioinformatics and phylogenetic procedures. The results revealed that all these isolates belong to the genus Streptomyces spp. The isolate PFK4 showed 99% similarity with Streptomyces albulus while PFBOT7 showed 99% similarity with Streptomyces albus and PFEL2 showed 98% similarity with Streptomyces gandoceansis based on their 16S rRNA gene sequences. In this study for the first time, we report S. gandocaensis strain for the biological control of Pythium myriotylum. The role of these isolates in Plant Growth Promotion (PGP) by in vitro production of PGP traits such as phosphate solubilisation, siderophore, indole-3-acetic acid (IAA), ACC deaminase and cell wall degrading enzymes production were also evaluated and showed as potential PGP agents. Concurrent production of PGP substances coupled with broad spectrum of antifungal and antibacterial activities of these three strains suggest their potential use as promising biocontrol and PGP tools for the development of an alternative control method for cocoyam cultivation.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134263494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Multiple linear and spatial regressions to estimate the influence of Latosol properties on black pepper productivity 利用多元线性和空间回归估计红壤性状对黑胡椒产量的影响
June 2019 Pub Date : 2019-06-20 DOI: 10.21475/AJCS.19.13.06.P1424
W. Z. Quartezani, J. S. S. Lima, T. A. Pletsch, E. C. D. Oliveira, S. S. Berilli, Euzileni Mantoanelli, Robson Prucoli Posse, Luana Mendes Suci
{"title":"Multiple linear and spatial regressions to estimate the influence of Latosol properties on black pepper productivity","authors":"W. Z. Quartezani, J. S. S. Lima, T. A. Pletsch, E. C. D. Oliveira, S. S. Berilli, Euzileni Mantoanelli, Robson Prucoli Posse, Luana Mendes Suci","doi":"10.21475/AJCS.19.13.06.P1424","DOIUrl":"https://doi.org/10.21475/AJCS.19.13.06.P1424","url":null,"abstract":"There is little knowledge available on the best techniques for transferring spatial information such as stochastic interpolation and multivariate analyses for black pepper. This study applies multiple linear and spatial regression to estimate black pepper productivity based on physical and chemical properties of the soil. A multiple linear regression including all properties of a Latosol was performed and followed by variance analysis to verify the validity of the model. The adjusted variograms and data interpolation by kriging allowed the use of spatial multiple regression with the properties that were significant in the multiple linear regression. The forward stepwise method was used and the model was validated by the F-test. The influence of the Latosol properties was greater than the residual on the prediction of productivity. The model was composed by the physical properties fine sand (FS), penetration resistance (PR), and Bulk density (BD), and by the chemical properties K, Ca, and Mg (except for Mg in the spatial regression). The physical properties were of greater relevance in determining productivity, and the maps estimated by ordinary kriging and predicted by the spatial multiple regression were very similar in shape.","PeriodicalId":227331,"journal":{"name":"June 2019","volume":"227 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124373891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信