Tolerância ao estresse hídrico em variedades locais de feijão caupi em fase de plântulas

Abstract

The tolerance of plants to drought stress is an important defense of the plant to maintain production in low water conditions, especially in areas such as the semi-arid region, where the rainfall distribution is very irregular and the summers are long. Therefore, it is recommended to use varieties that are more rustic, tolerant to drought stress and which have greater ability to recover after drought. The aim of this study was the possibly identify tolerant and sensitive varieties to water stress, from the evaluation of the variable "number of days for severe wilting of cowpea plants." The work was done from an experiment carried out in October and November 2015, where 30 varieties of cowpea were subjected to water stress on the seventh day after sowing (DAS), in order to be evaluated for tolerance dry. Among the total number of varieties, 25 were collected in different municipalities in the state of Ceará, and prefer ably grown on family farms, three (CE-031, CE-315,CE-930) came from the Active Germplasm Bank (AGB) of cowpea beans of the Federal University of Ceará, in addition to the varieties of Pingode ouro 1,2and Santo Inácio. The variety Pingo de ouro 1,2 was used as witness variety for tolerance to drought stress, while Santo Inácio variety was used as witness for susceptibility to water stress. Statistical analyzes performed showed no significant differences among the treatment means. In this work, tolerant or sensitive to water stress varieties were no found between local cowpea varieties evaluated, using the criteria "number of days for the permanent wilting".