Short-Time of Rehydration is not Effective to Re-Establish Chlorophyll Fluorescence and Gas Exchange in Two Cowpea Cultivars Submitted to Water Deficit

  • Udson de Oliveira BARROS JUNIOR Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • Maria Antonia Machado BARBOSA Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Viçosa
  • Michael Douglas Roque LIMA Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas
  • Gélia Dinah Monteiro VIANA Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Viçosa
  • Allan Klynger da Silva LOBATO Núcleo de Pesquisa Vegetal Básica e Aplicada, Universidade Federal Rural da Amazônia, Paragominas

Abstract

Low water supply frequently interferes on chlorophyll fluorescence and gas exchange. This study aimed to answer if a short-time of rehydration is efficient to re-establish chlorophyll fluorescence and gas exchange in cowpea plants. The experiment used four treatments (sensitive / water deficit, sensitive / control, tolerant / water deficit and tolerant / control). The sensitive and tolerant cultivars after water restriction had significant changes in gas exchange. On the third day, the stress caused lower for PN and gs in sensitive cultivar of 67% and 45%, respectively. After rehydration these parameters were not recovered significantly to two cultivars. In relation to chlorophyll fluorescence, water stress caused significant changes in all parameters evaluated of cultivars, being observed effects more intense on sensitive cultivar in the parameters Fv/Fm (38%) and Fo (69%). Rehydration did not promote recovery of the values of Fv/Fm and Fo to sensitive cultivar. Therefore, our study revealed that a short-time of rehydration is not effective to re-establish chlorophyll fluorescence and gas exchange in cowpea plants submitted to water deficit.

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Published
2017-06-10
How to Cite
BARROS JUNIOR, U. de O., BARBOSA, M. A. M., LIMA, M. D. R., VIANA, G. D. M., & LOBATO, A. K. da S. (2017). Short-Time of Rehydration is not Effective to Re-Establish Chlorophyll Fluorescence and Gas Exchange in Two Cowpea Cultivars Submitted to Water Deficit. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 45(1), 238-244. https://doi.org/10.15835/nbha45110569
Section
Research Articles