NaCl胁迫对黄秋葵种子萌发和幼苗生理特性的影响

Effects of NaCl stress on the seed germination and seedling physiological characteristics of okra

以8个黄秋葵(Abelmoschus esculentus L.)品种(系)为材料,研究不同浓度的NaCl溶液处理下种子萌发期发芽表现及其幼苗期生理特征。结果表明:萌发期超级五角耐盐性最强,Y116耐盐性中等,扬大K5、南平黄秋葵、台湾五福、黄羊角、Y112、红五角耐盐性较差。幼苗期随盐胁迫的加重,丙二醛(MDA)含量、Na+含量、超氧化物歧化酶(SOD)活性逐步增加,K+含量逐渐减少,K+/Na+比值降低,过氧化物酶(POD)活性呈先升后降的趋势,且不同材料变化幅度不同。MDA、K+含量、K+/Na+比值等指标较好地反映了材料间的耐盐性,可以作为黄秋葵幼苗期耐盐评价的鉴定指标,SOD和POD酶活性的变化可以作为参考指标。

The objective of the investigation was to study the response of eight okra （Abelrnoschus esculentus L. ） geno types in terms of morphological parameters at seed germination stage and physiological characteristics at seedling stage under different NaC1 stress. The results showed that eight tested varieties were classified into three salt tolerance groups, CJWJ in salt tolerant group, Yl16 in intermediate group, and YDK5, NPHQK, TWWF, HYJ, Yl12, HWJ in salt sen- sitive group. With the increase of NaC1 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 signifi- cantly 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