Cecília Moreira Serafim, Arlene Santisteban Campos, Priscila Bezerra dos Santos Melo, A. D. Castro, A. Carvalho
{"title":"Types and concentrations of cytokinins in the micropropagation of Anthurium maricense","authors":"Cecília Moreira Serafim, Arlene Santisteban Campos, Priscila Bezerra dos Santos Melo, A. D. Castro, A. Carvalho","doi":"10.18227/1982-8470RAGRO.V12I2.4671","DOIUrl":"https://doi.org/10.18227/1982-8470RAGRO.V12I2.4671","url":null,"abstract":"Faced with the demand for plants potted for their foliage, Anthurium maricense is seen as a viable option. However, most of the studies on obtaining micropropagated plantlets are for A. andraeanum, with nothing yet reported for A. maricense. The aim of this study therefore, was to evaluate the effect of four cytokinins in different concentrations, on the in vitro induction of shoots from nodal segments of A. maricense. The experimental design was completely randomised in a 4 x 4 factorial scheme, with four cytokinins (BAP, ZEA, CIN and 2iP) and 4 concentrations (0, 2.22, 4.44 and 6.66 μM), for a total of 16 treatments, with 6 replications of five test tubes, and using one nodal segment. Cultures were kept in a growth room at 25 ± 2°C, a photoperiod of 16 h and a light intensity of 30 μmolm-2 s-1 for 60 days. After this period, the number of shoots formed per node was evaluated. The addition of a cytokinin to the culture medium was determinant for the in vitro regeneration of shoots in A. maricense. The greatest estimated number of shoot formations in A. maricense were obtained in the culture media containing ZEA (3.87) and BAP (3.30), both at concentration of 6.66 μM.","PeriodicalId":299264,"journal":{"name":"REVISTA AGRO@MBIENTE ON-LINE","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123391646","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}
Silvana Fraga Silva, Halina Stéffany Lopes Costa, Jesimiel da Silva Viana, A. O. Ferreira, Diego de Sousa Pereira, S. M. Filho
{"title":"Phytotoxicity of exotic plants on the physiological potential of seeds of native species of caatinga","authors":"Silvana Fraga Silva, Halina Stéffany Lopes Costa, Jesimiel da Silva Viana, A. O. Ferreira, Diego de Sousa Pereira, S. M. Filho","doi":"10.18227/1982-8470RAGRO.V12I2.4884","DOIUrl":"https://doi.org/10.18227/1982-8470RAGRO.V12I2.4884","url":null,"abstract":"The introduction of species is one of the major causes of biodiversity loss. Invasive exotic plants adapt, propagate and dominate, damaging both natural processes and native species. Thus, the objective was to evaluate the allelopathic effect of three exotic species in the caatinga, on the physiological quality of \u0000native forest seeds. Aqueous extracts of leaves of Azadirachta indica, Prosopis juliflora and Cryptostegia madagascariensis were tested to evaluate their effect on the seed germination and seedling vigor of Piptadenia moniliformis, Mimosa tenuiflora and Mimosa caesalpiniaefolia. Seed germination of M. tenuiflora was inhibited \u0000by the aqueous extracts of P. juliflora and A. indica in 100% and 42%, respectively, with a reduced GVI with the extracts of P. juliflora and C. madagascariensis. Regarding AEI, P. juliflora extract had positive effect on P. moniliformis seeds and negative on M. tenuiflora seeds, close to -1. A reduction in height of P. moniliformis was observed when the seedlings were in contact with the extracts of the invasive plants studied. For M. tenuiflora, the extract of P. juliflora prevented the formation of seedlings, and M. caesalpiniaefolia presented higher inhibitory effect with extracts of P. juliflora and A. indica. Therefore, M. tenuiflora showed to be sensitive to P. juliflora phytotoxicity.","PeriodicalId":299264,"journal":{"name":"REVISTA AGRO@MBIENTE ON-LINE","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125132257","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}
J. Silva, Evair Marcelo Queiroz da Silva, J. C. Nunes, M. A. D. Moura, Juliete Valdevino da Silva, A. A. Souza
{"title":"Yield of sweet potato as a function of organic fertilization and intercropping with Crotalaria juncea","authors":"J. Silva, Evair Marcelo Queiroz da Silva, J. C. Nunes, M. A. D. Moura, Juliete Valdevino da Silva, A. A. Souza","doi":"10.18227/1982-8470RAGRO.V12I2.4664","DOIUrl":"https://doi.org/10.18227/1982-8470RAGRO.V12I2.4664","url":null,"abstract":"In the northern region of Brazil, information for the sweet potato regarding suitable soil management, especially organic fertilisation and intercropping with species of green manure, are still in the early stages. The aim of this research therefore, was to evaluate the effect of poultry litter on the yield of sweet potato roots grown under a monocrop system and when intercropped with sunn hemp (Crotalaria juncea) under the soil and climate conditions of the State of Roraima. The experiment was carried out in the field from August to December of 2014, in the Sector for Olericulture of the School of Agricultural Technology, on the Murupu Campus of UFRR in the town of Boa Vista, Roraima. A randomised block experimental design was used, with three replications, in a (5 × 2) + 1 factorial scheme, representing five doses of poultry litter (0, 5, 10, 15 and 20 t ha-1), with sweet potato as both a monocrop and intercropped with sunn hemp, and one additional treatment with organic and mineral fertiliser. Slips of the Granfina variety of sweet potato were used for planting. Seeds of sunn hemp were sown in double rows between the rows of sweet potato 30 days after planting the slips, with the first cutting carried out 90 days after sowing. The addition of poultry litter to the soil increased the total production of sweet potato roots for the crop planted in Roraima, whether intercropped or not with sunn hemp. Despite the benefits to sweet-potato yield from the addition of poultry litter and the intercrop with sunn hemp, total productivity was greater in the additional treatment that received organic and mineral fertiliser.","PeriodicalId":299264,"journal":{"name":"REVISTA AGRO@MBIENTE ON-LINE","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132350476","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}
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