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|本期目录/Table of Contents|

铜胁迫对狭叶香蒲生长及生理特性的影响

《广西植物》[ISSN:1000-3142/CN:45-1134/Q]

期数:
2010年03期
页码:
367-372
栏目:
植物生态学与环境生理学
出版日期:
2010-05-25

文章信息/Info

Title:
Effect of Cu2+ stress on the growth and physiological properties of Typha angustifolia
作者:
赵 艳1 徐迎春2 柴翠翠2 周 燕2
1.南京溧水县特殊教育学校, 江苏 溧水 211200; 2.南京农业大学 园艺学院, 南京 210095
Author(s):
ZHAO Yan1 XU YingChun2 CHAI CuiCui2 ZHOU Yan2
1.Lishui Special Education School, Lishui 211200, China;2.College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
关键词:
狭叶香蒲 Cu2+胁迫 生长 生理特性
Keywords:
Typha angustifolia copper stress growth physiological characters
分类号:
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DOI:
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文献标识码:
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摘要:
采用水培法,研究不同浓度Cu2+胁迫对狭叶香蒲生长及生理特性的影响。结果表明:狭叶香蒲叶宽、株高的增长量及整株干物质累积量在较低浓度Cu2+处理时均未受影响,此后随Cu2+浓度升高显著下降。Cu2+浓度为0~30 mg?L1时,叶绿素含量显著上升,此后随Cu2+浓度增加其含量显著下降。在Cu2+浓度0~5 mg?L1范围内根系活力显著上升,此后随Cu2+浓度升高则大幅下降。根系和叶片SOD、POD、CAT活性随Cu2+浓度增加均呈先显著升高后显著降低的趋势,根系SOD、POD活性在30 mg?L1时出现最大值,叶片SOD、POD活性在55 mg?L1时出现最大值,根系和叶片CAT活性均在80 mg?L1时出现最大值;同一Cu2+浓度下,根系SOD、POD、CAT活性明显高于叶片,说明根系比叶片对Cu2+胁迫反应更敏感。从根系和叶片SOD/POD、SOD/CAT的比值变化上看出,在Cu2+为1 mg?L1和5 mg?L1时起主要保护作用的酶是SOD、POD,后来CAT起到主要作用。MDA含量自Cu2+浓度为30 mg?L1时开始持续上升。说明在Cu2+为30~55 mg?L1时狭叶香蒲表现为积极的生理响应。
Abstract:
Effects of Cu2+ stress on physiological properties and growth of Typha angustifolia were studied by hydroponic culture method. The results showed that the leaf width,plant height and the dry weight accumulation were not obviously affected at the low Cu2+concentration,but decreased with the increasing Cu2+concentration. The content of chlorophyll increased among 0-30 mg?L1 Cu2+ and decreased obviously with the increasing of Cu2+concentration. Root activity increased among 0-5 mg?L1 Cu2+ and also decreased apparently afterwards with the increasing of Cu2+concentration.. The activities of SOD,POD and CAT increased with the increasing of Cu2+concentration and decreased clearly afterwards. The highest value of SOD,POD of roots appeared at 30 mg?L1 Cu2+,while the peak values of in leaves were at 55 mg?L1 Cu2+. The activity of CAT reached to the highest at 80 mg?L1. The activities of SOD,POD and CAT of root were higher than leaves apparently under the same Cu2+concentration stress,it was suggested that sensitivity of roots to Cu2+concentrations were higher than that of leaves. The activities of SOD,POD played the main role on protecting T.angustifolia under 1-5 mg?L1Cu2+ stress,while CAT played the main role afterwards. The content of MDA reached to the high point at 30 mg?L1 Cu2+ and increased afterwards with the increasing of Cu2+concentration. It was suggested that T.angustifolia had an active physiological response under 30-55 mg?L1 Cu2+ stress.

参考文献/References

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备注/Memo

备注/Memo:
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更新日期/Last Update: 2010-05-25