Effects of NaCl stress on the seed germination and seedling physiological characteristics of okra
The objective of the investigation was to study the response of eight okra (Abelmoschus esculentus L.) genotypes in terms of morphological parameters at seed germination stage and physiological characteristics at seedling stage under different NaCl stress.The results showed that eight tested varieties were classified into three salt tolerance groups,CJWJ in salt tolerant group,Y116 in intermediate group,and YDK5,NPHQK,TWWF,HYJ,Y112,HWJ in salt sensitive group.With the increase of NaCl concentration,Malondialdehyde (MDA) content,Na+ content and the activities of superoxide-dismutase (SOD) in leaves increased,whereas the soluble protein and K+ content declined,the activities of peroxidase (POD) increased firstly and then decreased of all genotypes as compared to the controls,which showed significantly different physiological changes during seedling growth stage.The MDA content,K+ content,K+/Na+ ratio in the leaf of okra genotypes responded sensitively to the level of salt stress and this can be used as an identification index of salt tolerance at the seedling stage.Meanwhile the change of activity of SOD and POD may be used as a reference index of salt tolerance.
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