燕麦对盐碱胁迫的生理响应

通过分析渗透调节物质脯氨酸和可溶性糖含量的变化,利用洗叶技术分析燕麦叶片洗脱物的离子组成,以及对气孔周围结晶的X—ray分析,并利用扫描电子显微镜观察燕麦叶片的表面结构,研究了燕麦对盐碱胁迫的生理响应。结果表明,在盐碱胁迫下,燕麦叶片中脯氨酸和可溶性糖含量增加;经过混合盐处理后,叶片洗脱物主要由Clˉ、Na^＋、K^＋、HCO3ˉ、Mg^2＋和Ca^2＋等离子组成,不含CO3^2-和SO4^2-,其中Clˉ、Na^＋、K^＋含量极显著高于对照,HCO3ˉ、Mg^2＋含量显著高于对照,Ca^2＋含量与对照差异不显著;通过扫描电镜观察叶片表面,发现气孔周围分布着盐结晶,表明燕麦通过气孔排盐适应盐碱胁迫。

Physiological Responses to Saline-Alkali in Oats

By means of analyzing the content of proline and soluble sugar,leaves-washing technology,X-ray analysis and scanning electron microscope(SEM),the change of proline and soluble sugar and the composing of washings from oats leaves were analyzed,and superficial structure of leaves were observed under saline-alkali stress.The results revealed that the content of proline and soluble sugar increased with increasing salinity in both breeds,the washings from oats leaves of saline-alkali stress were comprised Cl-,Na ,K ,HCO-3,Mg2 and Ca2 and none of CO2-3 and SO2-4.The quantities of Cl-,Na and K of treated leaves washings were most significant higher than control.The quantities of HCO-3 and Mg2 of treated leaves washings were significant higher than control.There was none significant difference to the quantity of Ca2 between treated and control.There were large numbers of salt crystals on the stomata,the resistant mechanism in oats to saline-alkali stress is discharging salt by stomata.