摘要
以Hoagland溶液培养的三角叶滨藜幼苗为材料,分别采用电导率法、原子吸收分光光度计法和压力室法测定了不同浓度盐胁迫下三角叶滨藜根的质膜透性、离子吸收和根系反射系数,分析其抗盐特点和机制.结果表明:随着盐胁迫强度的增加,三角叶滨藜根细胞质膜透性增大、根系反射系数减小;盐胁迫导致三角叶滨藜根系对K+的总吸收量减少、对Na+的总吸收量增多,但对Na+的相对吸收量减少、对K+的相对吸收量增加.盐胁迫条件下,三角叶滨藜根系对离子吸收有较强的调节能力;而根系反射系数的减小有利于根系用较小的负压力吸收水分,减小木质部空化的危险.说明三角叶滨藜具有较高的抗盐能力.
Taking hydroponically cultured arrow-leaf saltbush（Atriplex triangularis） seedlings as test materials,and using electrical conductivity detector,atomic spectroscopy,and pressure bomb,this paper studied the effects of salt stress on the seedlings root membrane permeability,ion uptake,and reflection coefficient,and analyzed the salt-resistance characteristics and related mechanisms of A.triangularis.The results showed that with increasing salt stress,the root membrane permeability increased,but the reflection coefficient decreased.Salt stress decreased the total K＋ uptake and increased the total Na＋ uptake,but the relative amount of absorbed K＋ increased while that of absorbed Na＋ decreased.Under salt stress,A.triangularis roots had a higher regulation capability in their ion uptake,and the reduction of root reflection coefficient was favourable to the water absorption by the roots with moderate negative pressure,and accordingly,reduced the danger of xylem cavitation.All these features could be closely related to the higher salt-resistance of A.triangularis.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第9期2223-2227,共5页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(30471044)资助
关键词
三角叶滨藜
离子吸收
质膜透性
反射系数
盐胁迫
Atriplex triangularis
ion uptake
membrane permeability
reflection coefficient
salt stress.
