摘要
以天然盐生植物碱地肤（Kochia sieversiana）为材料,采用人工生态模拟方法对其施加0～480 mmol/L的盐胁迫（摩尔比1∶1的NaCl和Na2SO4）和碱胁迫（摩尔比1∶1的NaHCO3和Na2CO3）,测定了盐碱胁迫下的相对生长率（RGR）、叶绿素含量及丙二醛含量.结果表明：低浓度的盐胁迫（80 mmol/L）对碱地肤的生长具有刺激作用,其在高达480 mmol/L的盐胁迫或400 mmol/L的碱胁迫下仍能存活并维持一定的生长,具有强抗盐性和强抗碱性;在相同盐浓度下,碱地肤受碱胁迫的伤害强度和对碱胁迫所做出的胁变反应均大于对盐胁迫.可见,碱地肤的抗盐性强于抗碱性,受碱胁迫的伤害大于盐胁迫,维持高含水量可能是碱地肤适应高强度盐碱胁迫的重要特性.
A natural halophyte Kochia sieversiana was taken as the material. Using simulative ecological conditions,the seedlings of K. sieversiana were treated under the salt-stress conditions of 0-480 mmol· L^-1 mixed neutral salts NaCl and Na2SO4 （molar ratio=1 ： 1）,and the alkali-stress conditions of 0-480 mmol· L^-1 mixed alkaline salts NaHCO3 and Na2CO3 （molar ratio = 1： 1）. The relative growth rate （RGR） and other physiological index of stressed seedlings were determined to analyze K. sieversiana abilities and features of anti-salt and anti-alkali in order to investigate its physiological basis of ecological location. The results showed that K. sieversiana possessed of not only great salt resistance but also great alkali resistance. It still lived and maintained a slow growth under the salt stress of 480 mmol· L^-1 and the alkali stress of 400 mmol· L^-1. The salt-stress at low concentration （80 mmol· L^-1 ） did not inhibit its growth but stimulated its growth. Seeing from the strain indexes of RGR,chlorophyl content and malondialdehyde （MDA） content,under the same salt concentration,effect of the alkali-stress on the seedlings of K. sieversiana was more intensity than of the salt-stress. The strain responses of K. sieversiana to alkali-stress were more obvious than to salt-stress on average.
出处
《西北植物学报》
CAS
CSCD
北大核心
2007年第1期79-84,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(30571318)资助
关键词
盐胁迫
碱胁迫
盐生植物
碱地肤
salt stress
alkali stress
halophyte Kochia sieversiana
作者简介
贾娜尔·阿汗（1967-）,女（哈萨克族）,副教授.E-mail：jiana0999@126.com
通讯作者 石德成,教授,博士生导师,主要研究方向为植物逆境生理.E-mail：shidc274@nenu.edu.cn
