Hg <sup>2+</sup>胁迫下两优培九和武运粳7号水稻幼苗抗性差异的研究

Hg ²⁺胁迫下两优培九和武运粳7号水稻幼苗抗性差异的研究

摘要: 以三叶期的水稻幼苗为材料 ,比较了Hg²⁺ 污染对杂交稻两优培九和常规稻武运粳 7号的叶绿素含量、类囊体膜光系统Ⅰ (PSⅠ )和光系统Ⅱ (PSⅡ )电子传递活性、细胞膜透性、过氧化物酶 (POD)、过氧化氢酶 (CAT)活性和脯氨酸含量的影响。结果表明 ,随着Hg²⁺ 处理浓度的增加 ,两优培九和武运粳 7号的叶绿素含量、PSⅠ和PSⅡ的电子传递活性降低 ,而 2者的细胞膜透性、脯氨酸含量升高 ,两优培九的CAT活性、武运粳 7号的POD和CAT活性呈现先升后降的趋势 ,但两优培九的POD活性则呈现升高的趋势。两优培九对Hg²⁺ 污染的抗性明显大于武运粳 7号。

Abstract: Effects of Hg²⁺ on content of chlorophyll,electron transport activity of PSⅠ,PSⅡ,permeability of cell membrance,activity of POD,CAT and proline content in rice seedlings of Liangyoupeijiu and Wuyunjing No.7 varieties at the three leaf stage were studied.Results showed that with increase in concentration of Hg²⁺ ,the content of chlorophyll and electron transport activity of PSⅠ and PSⅡ decreased,and the activity of CAT in Liangyoupeijiu and of POD and CAT in Wuyunjing No.7 increased at first and decreased afterwards,but the activity of POD in Liangyoupeijiu increased.The resistance to Hg²⁺ pollution in Liangyoupeijiu is obviously stronger than that of Wuyunjing No.7.