Cu^2＋胁迫对龙葵生理生化特性的影响

主要研究了重金属Cu2 胁迫对龙葵部分生理生化特性的影响。结果表明,当Cu2 浓度为0.2 mmol/kg时,叶绿素含量达到峰值,随Cu2 浓度的增加,含量下降。几种光合色素对Cu2 的敏感性顺序为:叶绿素a>叶绿素a b>叶绿素b>类胡萝卜素。随Cu2 浓度增加,细胞膜透性呈上升趋势。在龙葵根、茎、叶中超氧化物岐化酶(SOD)活性、过氧化物酶(POD)活性和过氧化氢酶(CAT)活性有很大差异。龙葵根中SOD活性随Cu2 处理浓度增加而升高;茎中SOD活性随Cu2 浓度增加呈先升高后降低的趋势;叶中SOD活性随Cu2 浓度增加呈先下降后上升的趋势。POD活性根中明显高于茎和叶。龙葵根中CAT活性随Cu2 浓度增加呈极显著负相关;茎中的CAT活性则与Cu2 浓度变化无明显的相关性;叶中的CAT活性随Cu2 浓度增加呈先升后降的趋势。

Effect of Cu~(2 ) Stress on Physiological and Biochemical Properties of Solanum nigrum L.

Effects of Cu2 stress on physiological and biochemical properties of Solanum nigrum L.were studied.The results showed that the content of chlorophyll was up to peak value at 0.2 mmol/kg of Cu2 concentration and decreased afterwards.The sensibility of various photosynthetic pigments to Cu2 was in the order of chlorophyll a>chlorophyll a b>ctdorophyll b>carotenoid.Permeability of membrane increased with the increasing Cu2 concentration.The activities of SOD,POD and CAT were greatly different in roots,stems and leaves.SOD activities of roots increased with the increasing Cu2 concentration,but increased first and decreased afterwards in stems,in leaves decreased first and increased afterwards.The activities of POD in roots were higher than stems and leaves.The activities of CAT and Cu2 concentration displayed extreme significant negative correlation in roots,but had no obvious correlation in stems.CAT activities increased first and decreased afterwards with the increasing Cu2 concentration in leaves.