African Journal of
Agricultural Research

  • Abbreviation: Afr. J. Agric. Res.
  • Language: English
  • ISSN: 1991-637X
  • DOI: 10.5897/AJAR
  • Start Year: 2006
  • Published Articles: 6150

Full Length Research Paper

Gas exchange in upland cotton cultivars under water deficit strategies

Whellyson Pereira Araujo
  • Whellyson Pereira Araujo
  • Agricultural Engineering, Campina Grande Federal University, Paraíba, Brazil.
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Jose Rodrigues Pereira
  • Jose Rodrigues Pereira
  • Irrigation, Embrapa Cotton, Rua Oswaldo Cruz, 1.143-Centenário, CEP 58.428-095, Campina Grande, Paraíba, Brazil.
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Joao Henrique Zonta
  • Joao Henrique Zonta
  • Irrigation, Embrapa Cotton, Rua Oswaldo Cruz, 1.143-Centenário, CEP 58.428-095, Campina Grande, Paraíba, Brazil.
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Hugo Orlando Carvallo Guerra
  • Hugo Orlando Carvallo Guerra
  • Agricultural Engineering, Campina Grande Federal University, Paraíba, Brazil.
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Mailson Araujo Cordao
  • Mailson Araujo Cordao
  • Agricultural Engineering, Campina Grande Federal University, Paraíba, Brazil.
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Marcos Eric Barbosa Brito
  • Marcos Eric Barbosa Brito
  • Agricultural Engineering, Sergipe Federal University (UFS), São Cristóvão - SE, 49100-000, Brazil.
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  •  Received: 24 January 2019
  •  Accepted: 19 April 2019
  •  Published: 06 June 2019

Abstract

Aiming to evaluate the gas exchange of upland cotton cultivars cultivated in the Brazilian semiarid, subject to water deficit periods on the phenological stages, an experiment was carried out at the Campina Grande Federal University, Pombal county campus, Paraíba State, Brazil, between June and December 2015. Treatments were formed from a split-plot arrangement, in which the plots were 6 water deficit periods (P) (P1 = No deficit, P2 = Deficit in the initial growth stage, P3 = Deficit in the flower bud stage, P4 = Deficit in the flower stage, P5 = Deficit in the boll stage and P6 = Deficit in the open boll stage) and the subplots, 2 upland cotton cultivars (C) (C1 = Brazil Seeds 286 and C2 = BRS 336), in randomized block design, with 4 replicates. Water deficits reduced the gas exchange of the upland cotton plants, mainly stomatal conductance, transpiration and photosynthesis. The cotton cultivars BRS 286 and BRS 336 presented similar behavior in the different water deficits applied on different phenological stages. Cotton was less tolerant to water deficits in the boll formation stage and more tolerant in the initial growth and flower bud stages.

Key words: Gossypium hirsutum L. r. latifolium H., water stress, physiology.