Water restriction and physiological traits in soybean genotypes contrasting for nitrogen fixation drought tolerance

Autores

  • Paula Cerezini State University of Londrina; Dept. of Microbiology
  • Dáfila dos Santos Lima Fagotti State University of Londrina; Dept. of Agronomy
  • Antonio Eduardo Pípolo Embrapa Soybean
  • Mariangela Hungria Embrapa Soybean
  • Marco Antonio Nogueira Embrapa Soybean

DOI:

https://doi.org/10.1590/1678-992x-2016-0462

Palavras-chave:

Glycine max, abiotic stress, nodulation, total soluble sugars, ureides

Resumo

Biological nitrogen fixation (BNF) is essential to the economic viability of the soybean [Glycine max (L.) Merrill] crop in Brazil, but drought may impair the BNF processes. We evaluated physiological traits of nitrogen fixation drought-tolerant (NFDT) (R01-581F, R01-416F and R02-1325) and drought-susceptible (CD 215 and BRS 317) genotypes of soybean subjected to drought or regular water supply between 45 and 55 days after emergence, in an experiment under greenhouse conditions in pots containing non-sterile soil. R01-581F had more stable photosynthetic and transpiration rates, and higher intercellular CO2 levels under drought. Drought reduced the chlorophyll concentration in all genotypes, but with less intensity in R01-581F and R02-1325. The NFDT genotypes generally showed higher concentrations of N, K and Mn in shoots, irrespective of the water condition. Exposure to drought increased total soluble sugars in nodules in all genotypes, as well as the concentrations of ureides in leaves and nodules, whereas ureides in petioles increased only in the susceptible genotypes. Drought negatively affected photosynthetic and BNF attributes; however, R01-581F showed the best performance, with potential for use in breeding programs aiming at drought-tolerant varieties.

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Publicado

2017-04-01

Edição

Seção

Microbiologia Agrícola

Como Citar

Water restriction and physiological traits in soybean genotypes contrasting for nitrogen fixation drought tolerance. (2017). Scientia Agricola, 74(2), 110-117. https://doi.org/10.1590/1678-992x-2016-0462