PHYSIOLOGICAL RESPONSES OF COWPEA UNDER WATER STRESS AND REWATERING IN NO-TILLAGE AND CONVENTIONAL TILLAGE SYSTEMS

Authors

  • Rômulo Magno Oliveira de Freitas Instituto Federal de Educação, Ciência e Tecnologia Baiano, Valença, BA
  • Jeferson Luiz Dallabona Dombroski Agrarian Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN
  • Francisco Cláudio Lopes de Freitas Department of crop science, Universidade Federal de Viçosa, Viçosa, MG
  • Narjara Walessa Nogueira Agrarian Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN
  • José Rivanilso de Souza Pinto Agrarian Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN

DOI:

https://doi.org/10.1590/1983-21252017v30n303rc

Keywords:

Leaf area. Photosynthesis. Stomatal conductance. Vigna unguiculata. Water potential.

Abstract

The goal of this work was to evaluate the physiological responses of cowpea under water stress and rehydration in conventional and no-tillage systems. We evaluated two crop systems (conventional and no tillage) and three water conditions (no stress, moderate stress and severe stress). The following were determined: leaf area, total dry matter, photosynthetic rate, stomatal conductance, transpiration rate, internal CO2 concentration and leaf water potential. Water stress affected all variables evaluated, with the exception of leaf water potential. Cowpea recovered with respect to all variables after rehydration at both stress levels. Stomatal closure is an important drought tolerance mechanism, and cowpea can be considered a conservative species (i.e., one that prioritizes water status maintenance rather than photosynthetic rate). Planting systems did not affect photosynthetic rate. The tillage system promoted greater accumulation of biomass and higher leaf area.

Author Biographies

  • Rômulo Magno Oliveira de Freitas, Instituto Federal de Educação, Ciência e Tecnologia Baiano, Valença, BA
    Professor do IFBAIANO
  • Jeferson Luiz Dallabona Dombroski, Agrarian Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN
    Ciências Vegetais/Fisiologia Vegetal
  • Francisco Cláudio Lopes de Freitas, Department of crop science, Universidade Federal de Viçosa, Viçosa, MG
    Ciências vegetais/Plantas daninhas
  • Narjara Walessa Nogueira, Agrarian Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN
    Departamento de ciências vegetais
  • José Rivanilso de Souza Pinto, Agrarian Sciences Center, Universidade Federal Rural do Semi-Árido, Mossoró, RN
    Departamento de Ciências Vegetais

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Published

21-03-2017

Issue

Section

Agronomy