CRESCIMENTO E PIGMENTOS CLOROPLASTÍDICOS DE GENÓTIPOS DE FEIJÃO VIGNA SOB DÉFICIT HÍDRICO

Abstract

The objective of this work was to evaluate the growth, accumulation of dry mass and chloroplastidic pigment content in Vigna bean genotypes under replacement irrigation levels. The research was carried out, in an area with soil characterized as Neosol Flúvico, in the municipality of Catolé do Rocha - PB, Brazil. The experiment consisted of a study of three genotypes of Vigna beans (G1 = BRS Aracé, G2 = BR 17 Gurgueia and G3 = BRS Marataoã) and four irrigation slides (40, 60, 80 and 100% ETc), combined results in a 3 x 4 factorial, organized in a randomized block design with four replicates. During the conduction of the experiment, the plants were evaluated for leaf area, chlorophyll a, b and carotenoids, and for the accumulation of dry mass in leaf, stem and total. Irrigation in Vigna beans, for the study region, can be programmed in 80% of crop evapotranspiration. The 'BRS Marataoã' genotype showed the highest growth, accumulation of dry mass and chloroplastidic pigment contents, standing out as more tolerant to water stress than 'BRS Aracé' and 'BR 17 Gurgueia'. The genotype 'BRS Aracé' had the worst growth rates, dry mass accumulation and the lowest carotenoid contents under water deficit conditions, being the most sensitive among 'BRS Marataoã' and 'BR 17 Gurgueia' genotypes.