干旱及复水对小冠花光合及叶绿素荧光参数的影响

doi:10.11733/j.issn.1007-0435.2013.06.015

›› 2013, Vol. 21 ›› Issue (6): 1130-1135.DOI: 10.11733/j.issn.1007-0435.2013.06.015

干旱及复水对小冠花光合及叶绿素荧光参数的影响

杨文权¹, 顾沐宇², 寇建村², 雷忠萍¹, 程积民³

1. 西北农林科技大学生命科学学院, 陕西杨凌 712100;
2. 西北农林科技大学动物科技学院, 陕西杨凌 712100;
3. 中国科学院水利部水土保持研究所, 陕西杨陵712100

收稿日期:2013-04-09 修回日期:2013-05-28 出版日期:2013-12-15 发布日期:2013-11-27
通讯作者: 寇建村
作者简介:杨文权（1975-），男，陕西扶风人，博士，讲师，主要从事植物学方面的教学和科研工作，E-mail：wenquan05@sina.com
基金资助:
现代农业产业技术体系建设专项资金（CARS-35-40）；农业部牧草种质资源保护项目（NB08-2130135-43）；国家科技支撑项目（2011BAD17B05）；农业部公益性行业专项（200903060）资助

Effects of Drought and Rewatering on the Photosynthesis and Chlorophyll Fluorescence of Coronilla varia

YANG Wen-quan¹, GU Mu-yu², KOU Jian-cun², LEI Zhong-ping¹, CHENG Ji-min³

1. College of Life Sciences, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
2. College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
3. Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi Province 712100, China

Received:2013-04-09 Revised:2013-05-28 Online:2013-12-15 Published:2013-11-27

摘要/Abstract

摘要： 为研究持续控水干旱胁迫和复水对小冠花（Coronilla varia）光合和叶绿素荧光参数的影响，从光合生理角度揭示小冠花对干旱的适应性，采用盆栽控水法对小冠花持续干旱18 d后复水，以保持土壤相对含水量在70%~75%的小冠花为对照，在干旱6，12 和18 d及复水后3 d测定小冠花光合及叶绿素荧光参数。结果表明：在停止浇水后第6，12 和18 d时，土壤相对含水量（RWC）从75%分别下降到了50%，35%和25%。小冠花在受到土壤干旱胁迫后，净光合速率（P_n）、气孔导度（G_s）、胞间二氧化碳浓度（C_i）、蒸腾速率（T_r）、PSⅡ最大光化学量子效率（F_v/F_m）、PSⅡ光能实际转化效率（Yield）、PSⅡ非循环电子传递速率（ETR）、光化学荧光猝灭系数（qP）均呈下降趋势，而叶片初始荧光（F_o）、非光化学荧光淬灭系数（NPQ）呈上升趋势。胁迫第6 d时，G_s和T_r下降，其余各指标均无显著变化；第12和18 d时，P_n，G_s，C_i，T_r，F_v/F_m，Yield，ETR 和qP均显著下降（P<0.05），NPQ显著升高（P<0.05）；而F_o在持续干旱第18 d时显著高于对照（P<0.05）。同时，绝大多数参数的变化幅度随胁迫时间增加而增大；但在复水3 d后，处理和对照的各参数均无显著差异。这表明持续的干旱胁迫影响小冠花光合作用，重度胁迫还会造成光合中心结构受损，此作用和干旱胁迫的时间长短相关；但小冠花对干旱有较强的适应性，在胁迫解除后，受损的光合中心能及时得到修复，光合作用能很快恢复至正常水平。

关键词: 小冠花, 干旱, 复水, 光合, 叶绿素荧光

Abstract: In order to disclose the photosynthetic adaptability of Coronilla varia to drought, the effect of continuous drought stress and rewatering on the characteristics of photosynthesis and chlorophyll fluorescence were studied. C. varia was not watered for 18 days, and then rewatered during pot test. The plants growing in the soil with 70%~75% relative water content (RWC) were taken as control. The parameters of photosynthesis and chlorophyll fluorescence were measured on the 6^th, 12^th, 18^th day after no-watering and the 3^rd day after rewatering. Results showed that the RWC of soil decreased from 75% to 50%, 35% and 25% on the 6^th, 12^th and 18^th day after the plants were not watered, respectively. The P_n, G_s, C_i, T_r, F_v/F_m, Yield, ETR and qP of leaf significantly decreased on the 12^th and 18^th day after no-watering, while NPQ significantly increased (P<0.05). However, F_o didn't significantly increased during drought stress. The most parameters of photosynthesis and chlorophyll fluorescence increased with the stress time going. However, there was no significant difference for all parameters between treatments and control on the 3^rd day after rewatering. These results indicated that continuous drought stress influenced the photosynthesis of C. varia, and the severe stress could lead to the damage of photosynthetic reaction center. However, the damage could be repaired soon and the photosynthesis could quickly be back to the level of control after rewatering due to the good adaptability of C. varia to drought stress.

Key words: Coronilla varia, Drought, Rewatering, Photosynthesis, Chlorophyll fluorescence

中图分类号:

杨文权, 顾沐宇, 寇建村, 雷忠萍, 程积民. 干旱及复水对小冠花光合及叶绿素荧光参数的影响[J]. , 2013, 21(6): 1130-1135.

YANG Wen-quan, GU Mu-yu, KOU Jian-cun, LEI Zhong-ping, CHENG Ji-min. Effects of Drought and Rewatering on the Photosynthesis and Chlorophyll Fluorescence of Coronilla varia[J]. , 2013, 21(6): 1130-1135.

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干旱及复水对小冠花光合及叶绿素荧光参数的影响

Effects of Drought and Rewatering on the Photosynthesis and Chlorophyll Fluorescence of Coronilla varia

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