甘蒙柽柳对NaCl胁迫的生理响应  

Physiological response of Tamarix austromongolica to NaCl stress

作　　者：刘克东[1] 郑彩霞[1] 郝建卿[1] 

机构地区：[1]北京林业大学林木育种国家工程实验室/林木花卉遗传育种教育部重点实验室/国家林业局树木花卉育种与生物工程重点开放实验室/北京林业大学生物科学与技术学院,北京100083

出　　处：《广东农业科学》2012年第10期38-42,55,共6页Guangdong Agricultural Sciences

摘　　要：利用盆栽法研究不同浓度NaCl(0%、0.5%、1.0%、2.0%、4.0%)胁迫对甘蒙柽柳生长和生理特性的影响,结果表明,较低浓度(0.5%)的NaCl对植株各项生理指标影响很小;对较高浓度(1.0%、2.0%、4.0%)NaCl处理,植株在气孔调节、保护酶系统、渗透调节物质方面均能作出较快响应,并能在胁迫初期(前8 d)维持相对正常生长,但随着胁迫时间的延长、NaCl浓度增加,植物生长受到明显影响,第8 d时,4.0%NaCl处理的植株相对电导率明显上升,接近对照的4倍,MDA的含量与其成正相关关系;脯氨酸含量在甘蒙柽柳受到盐胁迫后逐渐上升,而可溶性蛋白含量则在盐胁迫初期增加,后期逐渐减小;3种保护酶活性在胁迫后均呈先升高后下降的趋势,其中SOD与CAT的活性在第14 d达到最高,POD活性则是在第20 d达到最高;叶片叶绿素含量与Pn逐渐下降并呈相关关系。洗盐后,1.0%和2.0%NaCl处理的植株各项指标均可得到恢复,而4.0%NaCl处理的植株各项指标很难恢复。To understand the responses of Tamarix austromongolica Nakai to various levels of salt stress （0%, 0.5%, 1.0%, 2.0%, 4.0% ） and discuss its salt tolerance, this paper conducted a study with pot experiments. NaC1 at low concentration of 0.5% had tiny effect on each physiological index of the plants. Upon treatment of NaC1 at high concentrations of 1.0%, 2.0% and 4.0%, the plants could quickly respond at stoma adjustment, protective enzyme system and osmotic regulation substances. The plants can maintain comparatively regular growth during the early treatment period（first 8 days）. With time passing and the increase of NaC1 eonccntration, obvious effects on plants＇ growth show up. On the 8th day, relative conductivity of plants treated with NaC1 concentration of 4.0% obviously rises to 4 times of ck and MDA content has direct correlativity with relative conductivity. Proline content of T. （mstromongolica Nakai under salt stress gradually rises, while soluble protein content increases in early treatment period and then gradually decreases. Activities of 3 protective enzymes all increase first and then decrease under salt stress. Activities of SOD and CAD reach the peak on the 14th day, while the activity of POD reaches the peak on the 20＂ day. Chlorophyll content in leaves and Pn gradually decrease and have correlativity with each other. After salt-leaching, all the indices of plants treated with NaC1 concentration of 1% and 2% can be recovered, while the indices of plants treated with NaC1 concentration of 4.0% can barely recover.

关 键 词：甘蒙柽柳 生理响应 盐胁迫 

分 类 号：S718.43[农业科学—林学]