Absorção, fluxo no xilema e assimilação do nitrato em feijão-caupi submetido à salinidade
作者： Rafael Magalhães Aragão , Joaquim Albenísio Gomes Silveira , Evandro Nascimento Silva , Ana Karla Moreira Lobo , Antônia Tathiana Batista Dutra
DOI: 10.5935/1806-6690.20100014
关键词: Xylem 、 Enzyme assay 、 Chemistry 、 Transpiration 、 Light intensity 、 Sodium 、 Nitrate reductase 、 Salinity 、 Nitrate 、 Agronomy
摘要: This work was carried out to evaluate what is the nitrate acquisition stage (nitrate uptake, xylem flux or assimilatory reduction) most influenced by presence of NaCl in cowpea. Twelve day-old seedlings were treated with 50 mM nutrient solution during four days and measurements under two contrasting environmental conditions: typical day (full sun) completely cloudy (cloudiness). The salinity affected more intensely sap than transpiration. Plants showed a strong decrease both uptake rate leaf reductase activity as full sun day. Transpiration reduced cloudiness while remained unchanged, salt-treated control. Moreover, less In addition, negatively accumulation roots, stems leaves only accumulation, control stressed plants. Salinity affects flux, compared reduction cowpea leaves.
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