R E S U M OA cultura da mamona (Ricinus communis L.) é uma das mais importantes para a região semiárida do Brasil, sendo o cultivo efetuado, principalmente, com variedades crioulas, sem melhoramento genético e com baixa qualidade fisioló-gica. Face ao exposto, o objetivo deste trabalho foi avaliar a qualidade fisiológica de sementes de mamona crioula var. carrapatinho em função da posição do rácemo (cacho). O ensaio foi realizado na Universidade Estadual do Sudoeste da Bahia. Foi efetuada análise estatística -Delineamento Inteiramente Casualizado em esquema fatorial 2x3, correspondente a 2 situações morfológicas das sementes de mamona (presença e ausência de carúncula) provenientes dos rácemos localizados em 3 ramos distintos da planta (ramo primário, secundário e terciário). Os dados foram colhidos em condições laboratoriais e em estufa. Ao final do ensaio os dados foram submetidos a testes de homogeneidade de variância e teste de normalidade, e as médias obtidas foram comparadas pelo teste de Tukey ao nível de 5%. Concluiu-se que a qualidade das sementes crioula da variedade carrapatinho foi afetada pela posição do rácemo na planta, e que a remoção da carúncula afetou positivamente a maioria das características avaliadas nos testes de qualidade fisiológica de sementes, principalmente a condutividade elétrica. Palavras-chave: morfologia vegetal, oleaginosa, produção de sementes. A B S T R A C TThe castor culture (Ricinus communis L.) is one of the most important crops for the semi-arid region of Brazil. Cultivation mainly relies on landraces, without breeding and low physiological quality. The objective of this study was to evaluate the physiological quality of Creole castor seeds var. Carrapatinho depending on the position of the raceme. The experiment was conducted at the State University of Southwest Bahia. The statistical analysis included a completely randomized design in a 2x3 factorial, corresponding to 2 morphological situations of castor seeds (presence and absence of wattle) from the racemes located in 3 different branches of the plant (primary branch, secondary and tertiary). Data were collected in laboratory conditions and in a greenhouse. At the end of the experiment the data were submitted to variance homogeneity and normality tests, and the averages were compared by Tukey test at 5%. It was concluded that the quality of Creole seeds variety Carrapatinho was affected by the racemes position in the plant, and that removal of caruncles positively affected most of the characteristics evaluated in the physiological quality tests on seeds, especially the electric conductivity.
In field conditions, the more usual application of cytokinins is based mainly on seed treatment and foliar spraying. Nowadays, seed priming with plant growth regulators is a successful agricultural practice due to its easy application in annual crops, resulting in a higher vigor and production. In order to evaluate the effect of the treatment of common bean seeds with N6-benzyladenine (6-BA), in the morphophysiology and crop yield, an experiment was carried out in a greenhouse, in a completely randomized design with four replicates and five doses of 6-BA (0, 0.0375, 0.075, 0.1125 and 0.15 g kg-1 of seed). The growth regulator was applied to the seeds in order to cover their entire surface. At 30 days after emergence, the physiological parameters were increased as a function of the doses of 6-BA. On the other hand, at 30 and 45 days after emergence of the crop, there was a drastic reduction in nodulation with increased 6-BA doses, which resulted in the lower accumulation of leaf nitrogen, pod number, and common bean yield. The ranging doses till 0.15 g kg-1 of seed of the cytokinin 6-BA are not recommended in seed priming of common beans. However, the effective recommendation of cytokinin as a seed priming is still not determined, and studies about products and doses must be improved before recommendation.
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