欢迎访问《麦类作物学报》编辑部网站

作者	单位
张雯，王丽蓉，殷恒霞，李毅，赵鹏善，马小飞	（1.甘肃农业大学林学院，甘肃兰州 730070； 2中国科学院寒区旱区环境与工程研究所植物逆境生理生态实验室，甘肃兰州 730000）

摘要点击次数: 1350

全文下载次数: 1117

中文摘要:

为探讨镉胁迫下二穗短柄草（Brachypodium distachyon）叶片对各无机离子的吸收及离子间的平衡机制，测定0~300 μmol·L-1 CdSO₄溶液胁迫下二穗短柄草叶片中主要无机离子含量的变化。结果表明，随着镉胁迫程度的加剧，二穗短柄草叶片中出现“吸钠排钾”现象，即Na⁺和K⁺含量分别增加和下降；Ca²⁺、S^2-、Cd²⁺含量逐渐增加，而Mg²⁺、Si4+含量逐渐降低。叶绿素a、叶绿素b、叶绿素a+b含量在低浓度镉胁迫时虽有升高趋势，但随着处理浓度的逐渐增加而缓慢降低，叶片含水量也随之逐渐下降。说明二穗短柄草幼苗叶片无机离子吸收和平衡、光合色素合成、含水量均不同程度受到镉胁迫的影响，但植株能通过体内不同无机离子含量的变化来缓解镉胁迫危害,从而提高对其的耐受能力。

英文摘要:

To investigate the effect of Cd stress on growth and inorganic ions of Brachypodium distachyon (Bd21), we treated Bd21 seedlings with various concentration of CdSO₄ (0,50,100,150,200 and 300 μmol·L-1). Then examined their Chlorophyll and main Inorganic ions contents in the leaves. The result showed that with the CdSO₄ concentration increasing, the seedling of Bd21's Na⁺ content was increase, K⁺ content was reduced, so it appeared the “uptake Na prevent K” Cd resistance characteristics. Ca²⁺ content was also increased under Cd stress, it mainly induced to accumulate and participate in resistance in the seedlings Cd stress. Along with the Cd stress increase, Mg²⁺ and Si4+ content were decrease in the leaves, but S^2- was increase. The accumulation of Cd itself was increased. The growth and Chlorophyll (chla, chlb, chla+b) content of Bd21 seedlings were significantly inhibited by Cd stress. As compared with control, when Cd concentration reached 50 μmol·L-1, the Chlorophyll were more than control, but dropped after 100 μmol·L-1, at the same time, changes of water contents were decrease.These different inorganic ions contents mutually benefit each other and cooperate to promote their resistance to Cd stress.

查看全文查看/发表评论下载PDF阅读器

关闭