盐胁迫下外源脯氨酸对甜瓜幼苗体内K^＋、Na^＋、Ca^2＋、Mg^2＋和Cl^-含量及分布的影响  

Effects of exogenous proline on contents of K^+,Na^+,Ca^(2+),Mg^(2+) and Cl^-and their distribution in musk melon seedling under salt stress

作　　者：颜志明[1,2] 魏跃[1] 胡德龙[1] 王全智[1] 郭世荣[2] 

机构地区：[1]江苏农林职业技术学院,江苏句容212400 [2]南京农业大学园艺学院,农业部南方蔬菜遗传改良重点开放实验室,江苏南京210095

出　　处：《江苏农业学报》2014年第3期612-618,共7页Jiangsu Journal of Agricultural Sciences

基　　金：江苏省自然科学基金项目(BK20131243);江苏省"青蓝工程"资助项目;江苏省农业三新工程项目[SXGC(2012)373]

摘　　要：为明确盐胁迫下外源脯氨酸对甜瓜幼苗体内K+、Na+、Ca2+、Mg2+和Cl-含量及分布的影响,以玉皇和雪美两个甜瓜品种的幼苗为材料,采用营养液栽培进行试验。结果表明:盐胁迫降低了植株体内Ca2+、K+、Mg2+等离子的含量,增加了Na+和Cl-含量;盐胁迫下,根向茎选择性运输K+、Ca2+、Mg2+能力降低,而茎向叶选择性运输Ca2+、K+、Mg2+能力却显著增加;外源脯氨酸处理提高了盐胁迫下甜瓜幼苗植株各器官中Ca2+、K+、Mg2+等离子含量,降低了Na+和Cl-含量,增加了组织中的K+/Na+、Mg2+/Na+和Ca2+/Na+,提高了根向茎和茎向叶选择性运输K+、Ca2+、Mg2+的能力。说明在盐胁迫条件下,施用外源脯氨酸能促进甜瓜幼苗对K+、Ca2+、Mg2+的吸收,调节植株体内的离子区域化分布,缓解盐胁迫对甜瓜幼苗的伤害。The changes of K＋, Na＋, Ca2＋, Mg2＋and Cl-contents and their distribution were studied in musk melon seed-ling exposed to proline under salt stress. Salt stress decreased the contents of Ca2＋, K＋, Mg2＋, and increased the contents of Na＋and Cl-in melon seedling. Salt stress reduced the transfer of Ca2＋, K＋, Mg2＋from roots to stems, and improved the transfer of Ca2＋, K＋, Mg2＋from stems to leaves. Exogenous proline raised the contents of Ca2＋, K＋, Mg2＋in melon, the ratio of K＋/Na＋, Mg2＋/Na＋and Ca2＋/Na＋, and the transfer of K＋, Ca2＋and Mg2＋from root to stem and from stem to leaves, but lower the contents of Na＋and Cl-. It is concluded that exogenous proline can promote the uptake for K＋, Ca2＋, Mg2＋in melon seedling, and allevi-ate the salt damage by regulating regionalized ion distribution in plants.

关 键 词：脯氨酸 盐胁迫 甜瓜幼苗 离子 分布 

分 类 号：S652[农业科学—果树学]