Cu胁迫对狭叶香蒲体内元素吸收分配的影响  

Element absorption and distribution in Typha angustifolia under Cu stress.

作　　者：赵艳[1] 徐迎春[1] 吴晓丽[2] 王习习[1] 杨淑琴[1] 

机构地区：[1]南京农业大学园艺学院,南京210095 [2]宁夏大学农学院,银川750021

出　　处：《生态学杂志》2009年第4期665-670,共6页Chinese Journal of Ecology

基　　金：山东农业大学作物生物学国家重点实验室资助项目(院士基金2007)

摘　　要：采用水培法,研究了不同浓度Cu2+胁迫下狭叶香蒲(Typhaangustifolia)体内Cu及其他元素吸收分配的变化。结果表明:狭叶香蒲地上部和根系累积的Cu量均随Cu2+浓度升高显著增加;在同一浓度Cu2+胁迫下,根中Cu的累积量明显高于地上部。根系同一组织中的Cu百分含量随Cu2+浓度的升高均显著增加;同一Cu2+浓度下,根系各组织中Cu含量均表现为:中柱>皮层>表皮。低浓度(1和5mg.L-1)Cu2+对地上部及根中Ca、Mg含量及地上部Mn含量均无显著影响,但高浓度(80和100mg.L-1)Cu2+可促进植株对Ca的吸收,显著降低对Mg?Mn和Zn的吸收。较高浓度(55～100mg.L-1)Cu2+胁迫后,根系各组织对Ca的吸收增加,对Zn的吸收降低;55～80mg.L-1Cu2+胁迫下根系不同组织对Cl和K的吸收增加,但高浓度(100mg.L-1)Cu2+胁迫下则显著降低。根系累积的Ca、Zn和K主要分配到中柱中,Cl主要分配到皮层中。By the method of hydroponic culture, this paper studied the absorption and distribution of Cu and other elements in Typha angustifolia under stress of different concentration Cu^2＋. The results showed that the Cu accumulation amount in T. angustifolia aboveground part and root increased markedly with increasing Cu^2＋ concentration in the medium. Under the same Cu stress, root had an obviously higher Cu accumulation than.aboveground part. The Cu content in the same root tissues increased obviously with increasing Cu stress, and the root Cu content under the same Cu stresses was decreased in the order of pericycle tissues 〉 cortex tissues 〉 cuticle tissues. Low concentration Cu^2＋ （ 1 and 5 mg· L^-1 ） in the medium had no significant effects on the Ca and Mg contents in aboveground part and root and the Mn content in aboveground part, while high concentration Cu^2＋ （80-100 mg · L^-1） in the medium increased the Ca absorption but decreased the Mg, Mn, and Zn absorption remarkably. The Ca absorption increased while the Zn absorption decreased under the stress of 55-100 mg · L^-1 Cu^2＋ , and the Cl and K absorption increased under the stress of 55-80 mg · L^-1 Cu^2＋ but decreased obviously under the stress of 100 mg · L^-1 Cu^2＋. The accumulated Ca and Zn in root mainly distributed in pericycle tissues, while the accumulated Cl was mainly in cortex tissues.

关 键 词：狭叶香蒲 CU^2+胁迫 元素 吸收 分配 

分 类 号：X173[环境科学与工程—环境科学]