盐胁迫下镧对水稻幼苗生长的保护效应  

The Protective Effects of La on the Growth of Rice Seedlings under Salt Stress

作　　者：张杰[1] 黄永杰[1] 周守标[1] 

机构地区：[1]安徽师范大学生命科学学院重要生物资源保护与利用研究安徽省重点实验室,安徽芜湖241000

出　　处：《激光生物学报》2010年第1期31-37,共7页Acta Laser Biology Sinica

基　　金：安徽省高校自然科学基金重点项目(2006kj060a);安徽省高校生物环境和生态安全重点实验室专项基金项目(2004sys003);安徽师范大学青年基金(2005xqn10)

摘　　要：通过液培实验,研究水稻幼苗在盐胁迫下,镧对水稻幼苗的保护作用。结果表明:水稻幼苗植株在≤1.5%的盐浓度的盐胁迫下,10 mg·L^(-1)镧能提高幼苗植株超氧化物歧化酶(SOD)和过氧化氢酶(CAT)的活性;降低幼苗植株脂质过氧化产物丙二醛(MDA)的含量和脯氨酸(Pro)的含量;减小质膜透性;提高叶片叶绿素含量和叶绿素a/b的比值;增强根系的活力,进而促进水稻幼苗的生长。10 mg·L^(-1)镧对盐胁迫的缓解作用与盐浓度有关,随着盐浓度增大,镧的缓解作用将逐渐消失。分析表明,在≤1.0%和≥0.5%的盐浓度胁迫下,镧对水稻幼苗的生长存在更有效的防御机制,能够促进水稻幼苗的生长代谢。The protective effects of La （ NO3 ） 3 on the growth of rice seedlings under salt stress were evaluated by the nutrient solution culture experiment. The results showed that for the seedlings, 10 mg·L^-1 La（ NO3 ） 3 could improve the activities of protecting enzymes （superoxide dismutase--SOD, catalase--CAT） , decrease content of malondialdehyde （MDA） and proline（Pro） , and the penetrability of cell membrane, raise the content of chlorophyll in the leaves and the ratio of a/b in chlorophyll, improve roots activity in rice seedlings, then promoted the growth of rice seedlings unde stress of ≤1.5 % salts. The relieving function of 10 mg·L^-1 La（NO3）3 on the threats of salts had relation with the concentration of salts. La＇ s relieving function would gradually disappear with the increase of the concentration of salts. Under stress of 0.5 %- 1.0 % salts, there was a defense mechanism of rare earth elements lanthanum on the growth of rice seedlings, and 10 mg·L^-1 La（ NO3 ）3 could promote the metabolism of the plants.

关 键 词：盐胁迫 镧 水稻幼苗 保护效应 

分 类 号：Q946.91[生物学—植物学]