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- Title
Absorção, fluxo no xilema e assimilação do nitrato em feijão-caupi submetido à salinidade.
- Authors
Aragão, Rafael Magalhães; Silveira, Joaquim Albenísio Gomes; Silva, Evandro Nascimento; Lobo, Ana Karla Moreira; Dutra, Antônia Tathiana Batista
- Abstract
This work was carried out to evaluate what is the nitrate acquisition stage (nitrate uptake, xylem nitrate flux or assimilatory reduction) most influenced by the presence of NaCl in cowpea. Twelve day-old seedlings were treated with 50 mM of NaCl in nutrient solution during four days and measurements carried out under two contrasting environmental conditions: typical day (full sun) and completely cloudy day (cloudiness). The salinity affected more intensely the xylem sap flux and nitrate flux than transpiration. Plants treated with NaCl showed a strong decrease in both nitrate uptake rate and leaf nitrate reductase activity as in the full sun as in cloudy day. Transpiration was reduced by the cloudiness while xylem sap flux and nitrate flux remained unchanged, in both salt-treated and control. Moreover, nitrate uptake and nitrate reductase activity were less affected by cloudiness than the transpiration. In addition, NaCl negatively affected nitrate accumulation in roots, stems and leaves while the cloudiness affected only the leaf nitrate accumulation, both in control and stressed plants. Salinity affects more negatively the nitrate xylem flux, as compared with the nitrate uptake and nitrate assimilatory reduction in cowpea leaves.
- Subjects
COWPEA; GROWTH of plant cells &; tissues; PHYSIOLOGICAL effects of nitrates; WATER in agriculture; WATER treatment plant residuals; IRRIGATION farming; SALINE irrigation; PHYSIOLOGIC salines; PLANT growth; XYLEM; PHYSIOLOGY
- Publication
Revista Ciência Agronômica, 2010, Vol 41, Issue 1, p100
- ISSN
0045-6888
- Publication type
Article