TOLERANCE OF F2 POPULATIONS OF COWPEA TO WATER DEFICIT

Authors

  • Erina Vitório Rodrigues Postgraduate Program in Genetics and Breeding, Universidade Federal do Piauí, Teresina, PI
  • Kaesel Jackson Damasceno-Silva Embrapa Meio-Norte, Teresina, PI
  • Maurisrael de Moura Rocha Embrapa Meio-Norte, Teresina, PI
  • Edson Alves Bastos Embrapa Meio-Norte, Teresina, PI
  • Adriano dos Santos Genetics and Plant Breeding Laboratory, l, Universidade Estadual do Norte Fluminense Darcy Ribeiro; Campos dos Goytacazes, RJ

DOI:

https://doi.org/10.1590/1983-21252018v31n106rc

Keywords:

Vigna unguiculata. Abiotic stress. Grain production.

Abstract

Water deficit affects plant development and the overcoming of its effects depends on the genotype, duration of stress, severity of damage and development stage of the plant at water stress. Cowpea is considered tolerant to water deficit, however, studies have shown that its yield can be reduced under this condition. Thus, the objective of this work was to evaluate the effect of water deficit on F2 populations of cowpea and select tolerant genotypes. Thirty F2 populations of cowpea and their parents (BRS-Paraguaçu, Pingo-de-Ouro-1-2, BRS-Xiquexique, CNCx-698-128G, Santo-Inácio and MNC99-510F-16-1) were evaluated in two experiments, one under induced water deficit and other under full irrigation, in the experimental field of the Embrapa Mid-North, in Teresina, State of Piauí, Brazil. A triple lattice incomplete block experiment design was used, with three replications. The experimental plots consisted of six 2-m rows, with spacing of 1.0 m between rows and 0.50 m between plants. The grain production was evaluated and its decrease related to the relative production and tolerance to stress was calculated. The grain production of the genotypes had an average decrease of 29.83% under water deficit. The genotypes from the crosses BRS-Paraguaçu x CNCx-698-128G, BRS-Xiquexique x Pingo-de-Ouro-1-2, CNCx-698-128G x BRS-Xiquexique, CNCx-698-128G x MNC99-510F-16-1, Santo-Inácio x BRS-Xiquexique and MNC99-510F-16-1 x BRS-Paraguaçu had high production and high tolerance to water deficit.

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Published

11-12-2017

Issue

Section

Agronomy