碱胁迫下耐碱植物星星草体内柠檬酸特异积累现象(英)

被引：42

作者：

石德成

尹尚君

杨国会

赵可夫

机构：

[1] 东北师范大学生命科学学院,浙江农业技术师范专科学校,东北师范大学生命科学学院,山东师范大学生物系长春,宁波,长春,济南

来源：

Acta Botanica Sinica | 2002年 / 05期

关键词：

星星草; 碱胁迫; 柠檬酸; Na2CO3; 有机酸;

D O I：

暂无

中图分类号：

Q945.78 [协迫生理学];

学科分类号：

0903 ;

摘要：

对碱胁迫 (0 - 175mmol/LNa2 CO3 )下星星草 (Puccinelliatenuiflora (Griseb .)Scribn .etMerr.)体内柠檬酸的积累规律及其相关胁变指标进行分析测定。实验结果证明 :积累柠檬酸是星星草对碱胁迫特有的生理反应。盐胁迫(0 - 4 0 0mmol/LNaCl)下 ,柠檬酸含量反而稍有下降。柠檬酸积累量随碱胁迫强度增大而增大 ,低胁迫强度时积累量上升缓慢 ,当胁迫强度大于 10 0mmol/LNa2 CO3 时 ,积累量明显上升。柠檬酸积累与胁迫时间之间呈直角曲线关系 ,一定胁迫强度下胁迫 4h后即可测出柠檬酸含量明显上升 ,约 4 8h后渐趋最大值。碱胁迫 14 4h后星星草各部位中柠檬酸含量从高到低的顺序依次是老叶、成熟叶、老叶鞘、幼叶鞘、幼茎、老茎和幼叶。成熟叶中柠檬酸随碱胁迫强度增大而逐渐上升 ,老叶和叶鞘中的柠檬酸在碱胁迫强度大于 12 5mmol/L后急剧上升 ,茎中柠檬酸含量无明显增高 ,幼叶中柠檬酸含量基本不变。实验证明 ,碱胁迫下积累的主要是柠檬酸 ,其他有机酸无明显变化。

引用

页码：537 / 540

页数：4

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