Tropical agricultural research最新文献_第9页

Varietal Screen for Susceptible stage of Saccharum hybrids for Deltocephalus menoni (Hemiptera: Cicadellidae), vector of sugarcane White Leaf Disease 甘蔗白叶病媒介——膜壳蜂（半翅目：叶蝉科）糖杂种易感期品种筛选

Tropical agricultural research Pub Date : 2021-12-29 DOI: 10.4038/tar.v33i1.8534

K. Chanchala, K. Hemachandra, L. Nugaliyadde, V. Wanasinghe, W. Witharama

引用次数: 0

Behavioral Factors Influencing the Adoption of 1/2S d/2 Tapping System by Smallholder Rubber Farmers in Moneragala District 影响Moneragala地区橡胶小农采用1/2S d/2采胶制度的行为因素

Tropical agricultural research Pub Date : 2021-12-29 DOI: 10.4038/tar.v33i1.8524

P. Gunarathna, H. V. A. Wikramasuriya, M. Jayathilaka, W. Wijesuriya

引用次数: 0

Cellulose Decomposition Potential of Soil as Affected by Vegetable Cultivation: A Case Study in Kegalle District, Sri Lanka 蔬菜种植对土壤纤维素分解潜力的影响——以斯里兰卡凯格勒地区为例

Tropical agricultural research Pub Date : 2021-12-29 DOI: 10.4038/tar.v33i1.8531

W. Wickramaarachchi, W. Dandeniya

引用次数: 0

Spatial Integration of Vegetable Markets of Sri Lanka during COVID-19 Pandemic 2019冠状病毒病大流行期间斯里兰卡蔬菜市场的空间整合

Tropical agricultural research Pub Date : 2021-12-29 DOI: 10.4038/tar.v33i1.8538

D. Kumari, J. Weerahewa, D. Hemachandra

{"title":"Spatial Integration of Vegetable Markets of Sri Lanka during COVID-19 Pandemic","authors":"D. Kumari, J. Weerahewa, D. Hemachandra","doi":"10.4038/tar.v33i1.8538","DOIUrl":"https://doi.org/10.4038/tar.v33i1.8538","url":null,"abstract":"The majority of the vegetables moving through traditional supply chains pass via Dambulla Dedicated Economic Centre (DDEC), which is the main wholesale market in Sri Lanka, to the regional markets. With the COVID-19 pandemic, the Sri Lankan government implemented several measures to keep vegetable markets of the country integrated. The objective of this study was to examine the degree of market integration of nine regional wholesale vegetable markets with DDEC in Sri Lanka during the COVID-19 pandemic. Pairwise comparisons between vegetable prices at DDEC and regional markets were done using Engle- Granger Co-integration test to achieve this objective. The analysis was carried out in the first differenced form, which conformed to the Augmented Dickey-Fuller (ADF) tests of stationarity. Short-run price disequilibrium was tested using Vector Auto-Regression Model (VAR) and Vector Error Correction Model (VECM). Weekly wholesale prices of beans, carrot, tomato, and brinjal markets during 2018-2021 were used for the analysis. The results revealed that only bean markets in Dehiaththakandiya, Thambuttegama, Nuwara Eliya, Meegoda, and Colombo wholesale vegetable markets depicted cointegrated behaviour with DDEC during the COVID-19 period. None of the other vegetable markets were integrated spatially with DDEC during the COVID-19 period. Before the pandemic, except in Ampara, Colombo and Dehiaththakandiya regional markets, all the other regional markets for beans, carrot, tomato, and brinjal were spatially integrated with DDEC either long run or short run. In conclusion, despite various government interventions to keep the vegetable market channels smoothly and consistently, the COVID-19 has negatively affected on price transmission of the vegetable marketing system of the country.","PeriodicalId":23313,"journal":{"name":"Tropical agricultural research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44934686","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

Snap Bean Breeding for Rust Resistance: Validation of Molecular Markers for The Ur-11 Gene Introgression 大豆抗锈育种：Ur-11基因导入分子标记的验证

Tropical agricultural research Pub Date : 2021-12-29 DOI: 10.4038/tar.v33i1.8535

H. Kumari, C. Weebadde, P. Bandaranayake, M. Corrales, R. Rajapakshe

引用次数: 1

Soil Microorganisms Increase Mobility of Iron to Rice (Oryza sativa L.) Plants 土壤微生物增加铁对水稻的移动性植物

Tropical agricultural research Pub Date : 2021-12-29 DOI: 10.4038/tar.v33i1.8449

W. Dandeniya, Y. Wijerathna, P. Palihakkara, Y. Mithrasena

引用次数: 0

Characterization of Lactic Acid Bacteria Isolated from Idli Batter and their Susceptibility to Antibiotics 从豆糊中分离的乳酸菌的鉴定及其对抗生素的敏感性

Tropical agricultural research Pub Date : 2021-10-01 DOI: 10.4038/tar.v32i4.8513

D. Bernard, N. Jeyagowri, T. Madhujith

{"title":"Characterization of Lactic Acid Bacteria Isolated from Idli Batter and their Susceptibility to Antibiotics","authors":"D. Bernard, N. Jeyagowri, T. Madhujith","doi":"10.4038/tar.v32i4.8513","DOIUrl":"https://doi.org/10.4038/tar.v32i4.8513","url":null,"abstract":"Idli is a common flour based fermented food prepared using lactic acid bacteria which bear probiotic properties, consumed in Sri Lanka and some parts of India. The objective of the present study was to characterize the lactic acid bacteria from idli batter, identify the changes of acidity during fermentation and to determine the antibiotic sensitivity of isolates. Lactic acid bacteria were isolated and characterized up to genus level. Subsequently, antibiotic susceptibility of isolates against four antibiotics was studied. Changes of pH, lactic acid bacterial count and titratable acidity with fermentation were determined. The pH value dropped steadily from 6.28 to 3.72 while titratable acidity increased from 0.24 to 0.92% during the fermentation period of 0 to 32 h. With fermentation, the lactic acid bacterial count was increased up to 9.88 log10cfu/g after 12 hours of fermentation and the count reduced with increasing acidity. A bacterial count of 5.91 log10cfu/g was recorded at the end of 32 hours of fermentation. Ten lactic acid bacteria isolates were identified from idli batter, of which six isolates were rod shaped and other four were cocci. All isolates were Gram positive, non-motile, no n-spore formers and catalase negative. According to the above tests, it was confirmed up to the genus level that all strains be longed to Lactic acid bacteria. All isolates were susceptible to more than two antibiotics. The diameter of the zone of inhibition ranged from 1-23 mm. The highest zone of inhibition was observed in isolates I-6 against chloromphenicol (23 mm) while the lowest zone of inhibition was observed in isolates I-2 against erythromycin (1 mm). With fermentation the biochemic al and sensory qualities of idli batter were changed. Lactic Acid Bacteria isolates showed different sensitivity towards antibiotics tested.","PeriodicalId":23313,"journal":{"name":"Tropical agricultural research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44168593","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

Phosphorus Mobilizing Capacity of Selected Grain Legumes Grown Under Phosphorus-Deficient Conditions 缺磷条件下精选粒豆类的磷动员能力

Tropical agricultural research Pub Date : 2021-10-01 DOI: 10.4038/tar.v32i4.8413

T. G. R. M. Thennegedara, D. Dissanayaka

{"title":"Phosphorus Mobilizing Capacity of Selected Grain Legumes Grown Under Phosphorus-Deficient Conditions","authors":"T. G. R. M. Thennegedara, D. Dissanayaka","doi":"10.4038/tar.v32i4.8413","DOIUrl":"https://doi.org/10.4038/tar.v32i4.8413","url":null,"abstract":"Compared with other crops, legumes have superior ability to mobilize part of non-labile phosphorus (P) into labile/available forms. We explored the P-mobilization potential of selected grain legumes and its influence on growth, P uptake, and yield under P-deficient conditions. A pot experiment was carried out in a greenhouse with soybean (Glycine max L.), cowpea (Vigna unguiculata L.), green gram (Vigna radiata L.), and black gram (Vigna mungo L.) with two P fertilizer applications; without (Pdeficient) and with (P-sufficient) Department of Agriculture recommended rates of triple super phosphate. Each crop was harvested at maturity and the bulk and rhizosphere soils were collected to quantify different P fractions using Hedley’s sequential fractionation. Dry weight and P accumulation in different plant organs, i.e. roots, stems, leaves, and pods, were measured. Most plant organs maintained similar dry weight and tissue-P concentration irrespective of the P levels applied. All crops reduced their total plant-P uptake under P-deficient conditions. However, this did not make any change in either pod dry weight or P concentration of pods. Soybean and mung bean had a greater P accumulation compared to cowpea and black gram under both P levels. In contrast, cowpea and black gram showed improved P use efficiency (PUE) than other two legumes. Available P concentration (NaHCO3-P) in rhizosphere soil is greater than that in bulk soil in soybean and cowpea whereas the rhizosphere NaHCO3-P content in mung bean was greatly decreased compared to that of bulk soil when the crop was cultivated in P-deficient soil. The concentration of non-labile P fraction in rhizosphere of all grain legumes were significantly low compared to that of the bulk soil. Results suggest that selected grain legumes could be cultivated in P-deficient soil as they can adapt either through enhancing P uptake or increasing PUE.","PeriodicalId":23313,"journal":{"name":"Tropical agricultural research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45977656","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 Some Potential Protocols to Extract DNA from Paddy Soil 几种水稻土DNA提取方法的评价

Tropical agricultural research Pub Date : 2021-10-01 DOI: 10.4038/tar.v32i4.8509

T. D. Ranasinghe, D. M. Costa, R. S. Dharmakeerthi

{"title":"Evaluation of Some Potential Protocols to Extract DNA from Paddy Soil","authors":"T. D. Ranasinghe, D. M. Costa, R. S. Dharmakeerthi","doi":"10.4038/tar.v32i4.8509","DOIUrl":"https://doi.org/10.4038/tar.v32i4.8509","url":null,"abstract":"Isolation of DNA from environmental samples is a crucial step in microbial community analyses through molecular methods. The present study was conducted to evaluate a DNA extraction protocol from paddy soil with a comparison on quality, quantity and integrity of the isolated DNA and to determine the suitability of extracted DNA for downstream applications in microbial community analyses. Three protocols (i.e. PEG/NaCl, Mannitol/C TAB and Sodium Phosphate Buffer) used for the extraction of DNA from different types of soil were attempted on paddy soil. The quality and quantity of the extracted genomic DNA was quantified spectrophotometrically and integrity was checked by gel electrophoresis. The efficiency of DNA extraction by the three protocols was compared with a commercia l soil DNA extraction kit (Norgen’s Soil DNA Isolation Plus Kit). Further, quality of the extracted DNA for PCR amplification was assessed using universal primer pairs for bacteria and fungi. DNA extracted using PEG/NaCl method resulted in the highest DNA concentration, while the highest purity was recorded by the DNA extracted by Mannitol/CTAB method (A 260/A280 = 1.61 and A260/A230 = 1.15). Expected PCR products targeting 16s rDNA and ITS regions were obtained from the DNA samples extracted by Mannitol/CTAB method. Therefore, Mannitol/CTAB method used in the present study is suitable to extract high-quality DNA from paddy soil for molecular microbial studies.","PeriodicalId":23313,"journal":{"name":"Tropical agricultural research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47384248","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

Corm and Cormel Production Improvement of Gladiolus by Spacing and Size 利用间距和大小提高唐菖蒲果核和果核产量

Tropical agricultural research Pub Date : 2021-10-01 DOI: 10.4038/tar.v32i4.8409

N. Methela, M. Islam

{"title":"Corm and Cormel Production Improvement of Gladiolus by Spacing and Size","authors":"N. Methela, M. Islam","doi":"10.4038/tar.v32i4.8409","DOIUrl":"https://doi.org/10.4038/tar.v32i4.8409","url":null,"abstract":"Gladiolus is one of the cut flowers in much demand throughout the world due to its spectacular colorful bloom and long shelf life. Corm and cormels are the major propagative units for this plant. However, lower multiplication rate is a great hindrance for commercia l production. This experiment was conducted at research plots of the Bangladesh Agricultural University, Mymensingh, Bangladesh during the period of October 2017 to May 2018. The two-factor experiment included plant spacing (S 1=25 cm x 20 cm, S2 = 20 cm x 30 cm, S3 = 25 cm x 30 cm) as factor A and corm size (C1 = Small corm, 30±2 g, C2 = Medium corm, 35±2 g, C3 = Large corm 40 g to 65 g) as factor B. Hence, nine combinations were set up as treatments with three replicates in a Randomized Complete Block Design (RCBD) to explore improvement of corm and cormel production of gladiolus. Positive responses were found in experimental parameter s such as corm diameter, weight of corm and cormels per plant, weight of corm and cormels per plot and yield of corms and cormels with increasing plant density and corm size. Results of the experiment revealed that yield of corms (23.08 t/ha) and yield of cormels (16.12 t/ha) were the highest with the treatment combination S3C3. This investigation concluded with the g reatest corm and cormel production of gladiolus through the combination of wider plant spacing and large corm size under experimental conditions in Bangladesh.","PeriodicalId":23313,"journal":{"name":"Tropical agricultural research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44357361","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