Identificação de genótipos de soja tolerantes a diferentes concentrações de NaCl

Abstract

Soybean is the main product of Brazilian agriculture, strengthening the country's position as one of the most important commodities in world agricultural trade. However, the salinity present in soils and irrigation waters can hinder the production process and generate economic damage. With the aim of selecting soybean genotypes tolerant to different sodium chloride (NaCl) conditions, 5 soybean genotypes were sown in rolls germitest paper with NaCl solutions at concentrations of 00, 40 and 80 mM. The evaluated characteristics were: final seedling stand, length of root and aerial part of the plant, fresh weight, dry weight of cotyledons, root and aerial part, percentage of germination, index of speed of germination and average time of germination. The design used was completely randomized, in a 3x5 factorial arrangement. The TMG 2383 genotype stood out from the others in the presence of salinity with a greater growth compared to the tested genotypes. The soybean varieties SYN 16861 IPRO, M8644 IPRO, TMG 2383 IPRO and NS8383 RR showed a certain level of resistance to saline stress. The genotypes resistant to saline stress can be used in genetic improvement programs in order to develop new cultivars with greater resistance to saline stress.