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Fortaleza, Brazil

Dutra A.T.B.,DBBV UFC | Silva E.N.,DBBV UFC | Rodrigues C.R.F.,DBBV UFC | Vieira S.A.,DBBV UFC | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2011

The purpose of this study was to characterize the effect of temperature on the distribution of Na +, Cl- and K+ in roots, stems and leaves of cowpea pre-treated with NaCl. After the acclimation period, plants were divided into two groups: 0 NaCl and 100 mM NaCl for 2 days. Subsequently, the plants were divided into 4 sub-groups and subjected to increasing temperatures of 27, 32, 37 and 42 °C, separately, for a photoperiod of 12 hours at each temperature. The treatment without NaCl at 27 °C was used as reference. The concentrations of Na+ and Cl- in different organs were increased by pretreatment with NaCl and this accumulation was intensified by exposure to high temperatures. In roots, for example, at temperature of 42 °C concentrations of Na were four times higher than in leaves. While Cl- accumulated mainly in leaves, with a 20-fold increase in the concentration of this ion in relation to reference plants. Inversely, K+ concentrations were reduced in all organs analyzed. Thus, it is conclude that high temperatures affect the distribution of ions in different organs directly affecting ion homeostasis in plants.

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