http://lattes.cnpq.br/9196855213423448; MOREIRA, Rômulo Carantino Lucena.
Resumen:
Water is one of the main limiting factors for the growth and development of
crops, which may affect the yield of plants, notably Vigna beans, justifying the use of irrigation.
When cultivated in areas of the semiarid
region, characterized by waters with high levels of
salts, attention should be paid to the use of genotypes that are more tolerant to salt stress, in
addition to adequate irrigation strategies, if they are with saline waters, in order to ensure
sustainability of the production system. In this work, the objective was to evaluate, in two
consecutive cultivation cycles, the tolerance of two genotypes of Vigna beans to saline stress
applied in different phenological phases, analyzing the existence of epigenetic regulations in the
second generation of the plants. The work was carried out in the field, with two experiments, the
first one between September and December 2018 and the second experiment was conducted
between August and November 2019, at the Rolando Rivas Experimental Farm, belonging to
the Federal University of Campina Grande, UFCG, Campus de Pombal , PB, located in the city
of São Domingos, PB. In the first experiment, the factors consisted of three genotypes of Vigna
beans submitted to seven salinity management strategies, varying the development stages of the
plants. Combined these factors resulted in 21 treatments where the experimental design was in
randomized blocks in a 7 x 3 factorial scheme, with four replications, totaling 84 experimental
plots, whose experimental unit was composed of 60 plants. In the second experiment, irrigation
management strategies resulted from the combination of phenological phases between the two
cycles, using water with high salinity, alternating with water with low salt concentration. Two
genotypes of Vigna beans were studied, submitted to ten salinity management strategies,
resulting in a 10 x 2 factorial, with four replications, totaling 80 experimental plots, each
experimental unit was composed of 60 plants. Growth, physiological and genotype production
variables were analyzed. The data obtained were subjected to analysis of variance, 'F' test (p
<0.05) and grouping test of means, ScottKnott
(p <0.05) for the factor of irrigation management
strategies and Tukey test, (p<0.05) for Vigna bean genotypes. The plants were more sensitive to
salinity in the vegetative phase, reflected in the formation of phytomass in both cultivation
cycles. The acclimatization was reflected in the gas exchange and fluorescence of chlorophyll
a.
