盐度对三种荒漠植物渗透调节物质积累影响的研究

Effects of Salinity on the Contents of Osmotica of Three Desert Plants

以甘肃省河西走廊荒漠盐碱地生长的盐爪爪、罗布麻和苏枸杞为研究材料,测定了其在不同盐度下叶片几种渗透调节物质的含量和Na+、K+-ATPase活性。研究了3种荒漠植物对盐胁迫的生理响应及适应特征。研究结果表明,盐爪爪叶片的Na+/K+比和Na++K+的总量均明显高于罗布麻和苏枸杞;土壤盐分增加,盐爪爪叶片的Na+、K+-ATPase活性增强,而罗布麻和苏枸杞叶片的Na+、K+-ATPase活性降低;盐爪爪可溶性糖分和脯氨酸的积累量均明显提高,而罗布麻和苏枸杞叶片可溶性糖分和脯氨酸的变化趋势不一致。可见盐爪爪对盐胁迫的耐受力和渗透调节力均强于罗布麻和苏枸杞。

Kalidium foliatum （Pall.） Moq, Apocynum venetum L. and Lycium ruthenicum Murr grew in different salted biotope of Hexi corridor, Gansu, were studied. Results showed that there were higher Na^＋/K^＋ ratios and total content of Na^＋ and K^＋ of leaves on Kalidium foliatum （Pall.） Moq than those on Apocynum venetum L. and Lycium ruthenicum. With soil salty content increasing, the Nat, K^＋-AT- Pase activity of leaves on Kalidium foliatum （Pall.） Moq became higher, however the activity of leaves on Apocynum venetum L. and Lycium ruthenicum Murr became lower; accumulation of proline and soluble sugar of leaves on Kalidium foliatum （Pall.） Moq increased, however the variation trend of proline and soluble sugar of leaves on Apocynum venetum L. and Lycium ruthenicum Murr was not identical. So there was osmotic adjustment ability and higher salty-tolerance in Kalidium foliatum （Pall.） Moq than those in Apocynum venetum L. and Lyceum ruthenicum Murr.