羊草对不同盐碱胁迫的生理响应  

Different physiological responses of Aneurolepidium chinense to NaCl and Na_2CO_3

作　　者：颜宏[1] 赵伟[2] 尹尚军[3] 石德成[1] 周道玮[1] 

机构地区：[1]东北师范大学生命科学学院,吉林长春130024 [2]空军航空大学航空救生系,吉林长春130022 [3]浙江万里学院生命科学学院,浙江宁波315101

出　　处：《草业学报》2006年第6期49-55,共7页Acta Prataculturae Sinica

基　　金：国家自然科学基金资助项目(30270139);东北师范大学校内青年基金项目(111439);博士点基金项目(305046000)资助

摘　　要：用不同浓度的NaCl（0～700mmol／L）和Na2CO3（0～200mmol／L）对羊草进行胁迫处理，通过测定与生长相关的生理指标．从而分析了2种盐对羊草生长的胁迫作用特点。实验结果表明，羊草对NaCl、Na2CO3处理的最高耐受浓度分别是600和175mmol／L。NaCl、Na2CO3处理不同程度地影响了羊草的营养生长以及物质代谢，具体表现为分蘖率、平均根茎数、相对含水量、相对生长率、叶绿素、氮古量的降低．其中以Na2CO3胁迫处理组尤为明显。NaCl、Na2CO3破坏羊草质膜功能，K^＋、电解质外渗率随着盐浓度的增加而增加。这一结果表明质膜的透性增大。TTC（红四氮唑）含量水平反映了NaCl、Na2CO3处理对羊草根系活力的影响，2种盐的处理降低了根系活力，特别是在Na2CO3处理组中，当Na^＋浓度超过200mmol／L时．植株根系TTC含量几乎为0。以上各生理指标表明：NaCl、Na2CO3不同程度地影响了羊草生长、光合作用以及物质代谢．其中以Na2CO3处理更为严重。The seedlings of A. chinense were stressed by NaCl（0-700 mmol/L） and Na2CO3 （0-200 mmol/L）. Many physiological indices were determined, relative growth rate, relative water content, root activity, cytoplasm osmosis, concentrations of chlorophyll and nitrogen. The results showed that the seedlings of A. chinense were alive only when the concentrations of salts were lower than 600 NaCl and 175 mmol/L Na2CO3. The growth of A. chinense was obviously depressed and with increasing salt concentrations, tiller rate, rhizome number, RGR, RWC, and concentrations of chlorophyll and nitrogen decreased. The effects of Na2CO3 on the growth of A. chinense were more severe than those of NaCl. The permeability of plasmalemma 〈 was increased and the function eventually destroyed by both NaCI and Na2CO3 stress. The extravasation rates of potassium and electrolyte increased with increasing salt stress. The concentrations of TTC, （the index of root activity）, were decreased with increasing salt stress and were almost zero when the concentration of Na^＋ exceeded 200 mmol/L. The effects of Na2CO3 were different and more severe than those of NaCl.

关 键 词：羊草 盐胁迫 碱胁迫 电解质外渗率 根系活力 

分 类 号：S543.9[农业科学—作物学]