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中国农学通报

中国农学通报 ›› 2009, Vol. 25 ›› Issue (24): 450-454.

所属专题： 生物技术； 水稻； 农业生态

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镉胁迫对不同抗性水稻品种幼苗生长和生理特性的影响

王阳阳 任艳芳 周国强 张晓建 何俊瑜   

  • 收稿日期:2009-07-14 修回日期:2009-08-17 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:

    水杨酸在植物抗镉胁迫中的作用及信号转导;谷胱甘肽在水稻抗镉胁迫的作用机制研究

Effect of Cadmium stress on seedlings growth and physiological characteristics in different rice cultivars

jy   

  • Received:2009-07-14 Revised:2009-08-17 Online:2009-12-20 Published:2009-12-20

PDF (PC)

1381

摘要：

以耐镉性不同的两个水稻品种（水稻秀水63和秀水09）为试验材料，采用溶液培养方法，研究不同浓度镉（0、1、5、10、25、50、100μmol/L-1）对水稻幼苗生长和生理特性的影响。结果表明：随Cd浓度增加水稻幼苗生长明显受抑，株高、叶绿素含量、叶片干重明显下降，且秀水63的下降幅度大于秀水09。总体上，脯氨酸含量、超氧化物歧化酶（SOD）、过氧化物酶（POD）活性均呈上升趋势，其中，在较低浓度Cd胁迫下，秀水63叶片中脯氨酸含量、POD活性增加幅度较大，而在较高浓度Cd胁迫下，秀水09的增加幅度较大。过氧化氢酶（CAT）活性表现为先上升后下降。丙二醛（MDA）含量随着Cd胁迫浓度的提高而增加, 且增加幅度秀水63大于秀水09。从实验结果表明，秀水09对Cd胁迫的抗性大于秀水63。

关键词: 巴西橡胶树, 巴西橡胶树, 品种性状, DUS测试

Abstract:

The seedlings growth and physiological characteristics of two rice cultivars with different resistance (Xiushui 63 and Xiushui09) were studied with a hydroponic experiment under different Cd concentration (0, 1, 5, 10, 25, 50, 100μmol/L). The results showed that rice seedlings growth restrained significantly with the increasing of Cd concentration and the decrease of height, chlorophyll content and leaf dry weight in Xiushui 63 was greater that those in Xiushui 09. The content of praline and activities of superoxide dismutase (SOD) and peroxidase (POD) were increased under Cd stress. The increase of proline content and POD was more pronounced in the xiushui 63 under lower level of Cd, however, it was more pronounced in the Xiushui 09 under higher level of Cd. The activity of Catalase (CAT) firstly increased and then decreased as the Cd concentration increased. The content of malondialdehyde (MDA) increased with Cd concentration increased, which was higher in Xiushui 63 than Xiushui 09 in the identical concentration of Cd. The experimental results show that Xiushui 09 was more resistant to Cd stress than Xiushui 63.