Abstract
Effect of different types of stresses on free proline content of leaves of cowpea (Vigna unguiculata L.) was investigated. Drought stress or salt stress enhanced the proline levels. Regression analysis of data indicated a good linear relationship between drought stress and proline concentration (r=0.91) and also between proline and NaCl concentration (r=0.81). Nitrogen (N), phosphorus (P), or calcium (Ca) deficiency increased the proline levels slightly, whereas the increase caused by magnesium (Mg) deficiency was significant. When combined salt stress and nutrient deficiency were applied, sulphur (S) deficiency enhanced the proline level significantly.
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