水土保持研究2011，Vol.18Issue(5)：187-190,196,5.
镉胁迫对黄瓜幼苗光合和叶绿素荧光特性的影响
Effects of Cd~（2＋） Stress on Photosynthesis and Chlorophyll Fluorescence Characteristics of Cucumber Seedlings
刘劲松 1石辉 1李秧秧2
作者信息
- 1. 西安建筑科技大学环境与市政工程学院,西安710055
- 2. 西北农林科技大学水土保持研究所黄：￡高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100
- 折叠
摘要
Abstract
The effects of different concentrations of cadmium（0,25,50,100,200 μmol/L） on the photosynthesis and chlorophyll fluorescence characteristics of cucumber seedlings were studied with a solution culture.The results showed that net photosynthetic rate（Pn）,stomatal conductance（Gs） and transpiration rate（Tr） greatly decreased but intercellular CO2 concentration（Ci） showed no change at the 4th day of cadmium stress,relative chlorophyll content only decreased at 200 μmol/L cadmium treatment,while major PSII florescence parameters（the maximal photochemical efficiency of PSII Fv/Fm,the actual photochemical efficiency of PSII in the light Yield and electron transport rate ETR） did not change,indicating a stronger stomatal limitation in the decline of photosynthesis for those treatments with cadmium lower than 200 μmol/L.On the 8th day of cadmium,net photosynthetic rate,stomatal conductance and transpiration decreased more sharply with the increase of intercellular CO2 concentration（Ci）,relative chlorophyll content and major fluorescence parameters except NPQ also decreased,implying a stronger nonstomatal limitation such as decreased chlorophyll content and destroyed PSII primary reaction.The lower value of main fluorescence parameters except NPQ at 50 μmol/L cadmium treatment on the 8th day might be related with serious Fe deficiency caused by cadmium stress.关键词
镉胁迫/黄瓜幼苗/光合作用/荧光特性Key words
cadmium stress/cucumber seedling/photosynthesis/fluorescence分类
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刘劲松,石辉,李秧秧..镉胁迫对黄瓜幼苗光合和叶绿素荧光特性的影响[J].水土保持研究,2011,18(5):187-190,196,5.
