Resumo

GARCIA RODRIGUEZ, Julio César et al. Resistance to drought in soybean genotypes considering morphological, physiological and agronomic characters. Rev. Mex. Cienc. Agríc [online]. 2017, vol.8, n.2, pp.431-437. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v8i2.62.

To characterize the resistance to drought in 25 soybean genotypes considering the yield, its components and other morphological and physiological characteristics, a test was established during the autumn-winter cycle 2012-2013 in Altamira, Tamaulipas. Two drought levels were compared: with and without drought; the moisture deficiencies were applied during the reproductive stage of the crop. The experimental design was divided plots with two replicates, large plots for drought levels and subplots for genotypes. There were 12 related variables with soil moisture and the phenological behavior, morphological, physiological and agronomic of plants. The stress response was evaluated using the drought resistance model 2, which separates the effects by classifying precocity groups. The genotypes presented different responses to face the drought. The drought significantly affects the rate of chlorophyll, stomatal conductance, pods m-1 and 100 seed weight, which together decreased performance. The decreased yield was more intense in late genotypes. The most resistant genotypes to drought according to the model used were H02-2295, H98-1240 and H10-0556.

Palavras-chave : Glycine max L. (Merr.); phenotypic characterization; yield and its components; model 2 drought resistance.

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