tailieunhanh - ABA-mediated proline synthesis in cowpea leaves exposed to water deficiency and rehydration

The aim of this study was to evaluate the impact of water deficit and rehydration on nitrogen compounds and abscisic acid of Vigna unguiculata leaves and to investigate the hypothesis that abscisic acid influences proline. | R. C. L. da COSTA, A. K. da S. LOBATO, J. A. G. da SILVEIRA, H. D. LAUGHINGHOUSE IV Research Article Turk J Agric For 35 (2011) 309-317 © TÜBİTAK doi: ABA-mediated proline synthesis in cowpea leaves exposed to water deficiency and rehydration Roberto Cezar Lobo da COSTA1, Allan Klynger da Silva LOBATO2,*, Joaquim Albenísio Gomes da SILVEIRA3, Haywood Dail LAUGHINGHOUSE IV4 1 Laboratory of Advanced Plant Physiology, Universidade Federal Rural da Amazônia, Belém - BRAZIL 2 Nucleus of Basic and Applied Plant Research, Universidade Federal Rural da Amazônia, Paragominas - BRAZIL 3 4 Laboratory of Metabolism and Stress Plant, Universidade Federal do Ceará, Fortaleza - BRAZIL Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC - USA Received: Abstract: The aim of this study was (i) to evaluate the impact of water deficit and rehydration on nitrogen compounds and abscisic acid of Vigna unguiculata leaves, and (ii) to investigate the hypothesis that abscisic acid influences proline. The experimental design was entirely randomized in a factorial design, with 2 water conditions (control and stress) and 7 evaluation periods (0, 1, 2, 3, and 4 days under water deficit, followed by the 5th and 6th day under rehydration). The leaf relative water content presented significant reduction, presenting a lower value on the 4th day of treatment under water deficit. After rehydration, the plants reestablished the leaf relative water content. The correlation analysis suggested a significant relationship between the leaf relative water content and abscisic acid. The abscisic acid concentration of the plants under water deficiency were of , , , , , , and mg kg-1 DM on days 0, 1, 2, 3, 4, 5, and 6, respectively. Rehydration quickly decreased abscisic acid. In addition, the correlation analysis indicated a significant relationship between abscisic acid and proline. The proline .