NaCl胁迫对大黄龙船花生长及生理生化的影响

摘要

The aim was to analyze thesaltresistance ofIxora collinea‘Gillettese How’. The growth and physiology indexes in ‘Gillettese How’ seedlings were studied under NaCl stress. The results showed that the seedling growth was inhibited significantly under salt stress. The MDA and proline contents, relative electric conductivity and membrane damage increased, and they had signiifcant positive correlations with NaCl concentration. The contents of chlorophyll and soluble protein in leaf decreased and negative correlation with NaCl concentration. However, there were no significant correlation between soluble sugar content, superoxide dismutase (SOD) activity and NaCl concentration. The growth of ‘Gillettese How’ was inhibited weakly under low NaCl stress (0.2%–0.6%), but it was affected greatly under high NaCl (0.8%–1.5%) stress.%为探讨大黄龙船花(Ixora collinea‘Gillettese How’)的耐盐特性，对NaCl胁迫下大黄龙船花扦插幼苗的生长和生理生化指标进行了研究。结果表明，NaCl胁迫处理后大黄龙船花叶片中的丙二醛含量、相对电导率和脯氨酸含量升高，膜伤害程度加大。叶片相对电导率、丙二醛含量和脯氨酸含量与NaCl浓度间存在显著正相关关系。随着盐胁迫浓度的增加，叶片总叶绿素、可溶性蛋白质含量呈下降趋势，两者与NaCl浓度间呈显著负相关关系。可溶性糖含量、SOD活性与NaCl浓度间的相关性不显著。较低浓度的盐胁迫(0.2%~0.6%)对大黄龙船花的生长有轻微的抑制作用，而0.8%~1.5%的高浓度盐胁迫显著影响生理生化指标。