[1]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(05):187-190,196.
　LIU Jin-song,SHI Hui,LI Yang-yang.Effects of Cd2+ Stress on Photosynthesis and Chlorophyll Fluorescence Characteristics of Cucumber Seedlings[J].Research of Soil and Water Conservation,2011,18(05):187-190,196.
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镉胁迫对黄瓜幼苗光合和叶绿素荧光特性的影响

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 18 期数: 2011年05期 页码: 187-190,196 栏目: 出版日期: 2011-10-20
Title:
Effects of Cd2+ Stress on Photosynthesis and Chlorophyll Fluorescence Characteristics of Cucumber Seedlings
作者:
刘劲松1, 石辉1, 李秧秧2
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 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100
Author(s):
LIU Jin-song1, SHI Hui1, LI Yang-yang2
1. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China;
2. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi 712100, China
关键词:
镉胁迫; 黄瓜幼苗; 光合作用; 荧光特性
Keywords:
cadmium stress; cucumber seedling; photosynthesis; fluorescence
分类号:
X592;S642.2;S601
摘要:
通过室内水培试验，研究了不同浓度镉处理（0，25，50，100，200 μmol/L）对黄瓜幼苗叶片光合及叶绿素荧光特性的影响。结果表明：镉胁迫第4天，净光合速率、气孔导度和蒸腾速率已显著下降，但细胞间隙CO2浓度变化不大；叶绿素相对含量仅在200 μmol/L镉胁迫时下降；叶绿素荧光参数Fv/Fm、Yield和ETR变化不大，表明200 μmol/L以下镉处理光合下降的主要原因是气孔因素。在胁迫第8天，所有镉处理净光合速率、气孔导度、蒸腾速率进一步下降，细胞间隙CO2浓度上升，叶绿素相对含量和除NPQ外的所有荧光参数也显著下降，表明此时光合下降与非气孔因素如叶绿素相对含量下降和原初光化学反应受到伤害等有关。50 μmol/L镉胁迫导致除NPQ外的所有荧光参数出现一低谷值，原因可能与镉胁迫引起的严重Fe缺乏有关。
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.

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备注/Memo

收稿日期:2011-2-22;修回日期:2011-3-15
作者简介:刘劲松（1985-）,男，山西晋城人，硕士研究生，主要研究方向为环境生态学。E-mail：ljing_song@163.com
通讯作者:石辉（1968- ），男，陕西眉县人，博士，教授，主要从事水土保持方面的研究。E-mail：shihui@xauat.edu.cn

更新日期/Last Update: 1900-01-01