文献类型：期刊文献

中文题名：盐胁迫对国槐和核桃幼苗光合作用的影响

英文题名：Comparison Study on Photosynthesis of Pagoda Tree and Walnut Seedlings under Salinity

作者：张川红[1] 沈应柏[2] 尹伟伦[2]

第一作者：张川红

机构：[1]中国林业科学研究院林业研究所;[2]北京林业大学生物学院

年份：2002

卷号：15

期号：1

起止页码：41-46

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：CSTPCD;;Scopus;北大核心:【北大核心2000】；CSCD:【CSCD2011_2012】；

基金：国家"九五"攻关项目"三北地区防护林植物材料抗逆性选育及栽培技术研究"

语种：中文

中文关键词：光合作用;盐胁迫;国槐;核桃;苗木;抗性机制

外文关键词：photosynthesis; salt stress; pagoda tree; walnut; seedling

分类号：S792.260.1;S664.101

摘要：研究了国槐与核桃半年生蛭石盆栽苗在盐 (NaCl溶液处理浓度为 5 0 ,10 0 ,2 0 0mmol·L- 1)胁迫条件下光合作用的变化。结果表明 ,核桃受盐胁迫后净光合速率明显下降 ,并且随盐浓度增大、胁迫时间延长而下降更多。国槐受盐胁迫后净光合速率增加 ,在短时间胁迫下增加多 ,随胁迫时间延长增加幅度变小。国槐与核桃在 2 0 0mmol·L- 1NaCl胁迫 2 4d内叶绿素a和b的含量变化不大 ,但核桃的叶绿素a/b之值下降。并且国槐的类胡萝卜素含量在盐胁迫后先增加后与对照相平 ,而核桃则明显下降。两个树种CO2 响应曲线的主要差别为国槐光呼吸速率下降为对照的4 3 7% ,核桃则比对照增加了 71.6 0 % ;国槐的CO2 补偿点比对照下降了 13.5 8% ,而核桃则比对照上升了 194 .15 %。两个树种在光响应曲线上的差别为国槐的暗呼吸速率比对照增加了 3倍多 ,而核桃则下降为对照的 6 5 .2 8%。
Photosynthesis of half year seedlings of pagoda tree and walnut were determined after different time treatment of 50,100 and 200 mmol·L -1 NaCl. Results showed that photosynthetic rate of walnut decreased distinctly and decreased more when the salinity increased and treatment time lengthened. Photosynthetic rate of pagoda tree increased after salt treatment and increment was less when treatment time lengthened. The content of chlorophyll a and b of both tree species changed little during 24 stressed days of 200 mmol·L -1 NaCl with the exception of ratio of chlorophyll a to b reduction in walnut. The content of xanthophyll in pagoda tree increased firstly and then kept the level as that of the control. In contrast to pagoda tree, the content of xanthophyll in walnut decreased obviously. Main difference between pagoda tree and walnut in CO 2 response curves was that photorespiratory rate in pagoda tree decreased to 43.7% of the control with 71.6% of the control increase in walnut and that CO 2 compensation point decreased 13.58% in pagoda tree with 194.15% increase in walnut both compared to the control. Light response curves revealed that dark respiratory rate of pagoda tree was 3 folds more than that of the control while that of walnut decreased to 65.28% of the control. And photo inhibition occurred in salt stressed walnut.