Abstract
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.
Highlights
1.1 Introduce the ProblemCommon bean is an important food of the Brazilian diet, mainly in the Northeast region of the country
At 30 and 45 days after emergence (DAE), the following evaluations were performed: number of nodules, nodules were detached from the root and counted; dry mass of root and shoot, the material was oven dried with forced circulation of air, at 65 oC for 72 hours, and weighed; SPAD index, obtained with portable chlorophyll meter (SPAD 502, Minolta, Japan)
These results corroborate with those observed in this study, where the application of 6-BA increased the parameters of gas exchange between plant and atmosphere
Summary
Common bean is an important food of the Brazilian diet, mainly in the Northeast region of the country. The hormones contents in a seed reserve tissue are considered a maternal legacy effect, as a memory of the environment of the previous generation, defining, sometimes, the plant vigor potential (Crisp, Ganguly, Eichten, Borevitz, & Pogson, 2016). Interfering in this maternal memory relationship, seed priming has been applied as a way to enhance an efficient and rapid response to environmental challenges and reach a higher vigor. The objective of this work was to evaluate the effects of seed priming of common bean (Phaseolus vulgaris) with 6-benzyladenina in the morphophysiology and crop yield
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