粳稻生育后期剑叶光合日变化和光合色素对大气CO2浓度和温度升高的响应——FACE研究

doi:10.13287/j.1001-9332.201801.022

应用生态学报 ›› 2018, Vol. 29 ›› Issue (1): 167-175.doi: 10.13287/j.1001-9332.201801.022

粳稻生育后期剑叶光合日变化和光合色素对大气CO₂浓度和温度升高的响应——FACE研究

袁嫚嫚^1,2,3, 朱建国^1*, 刘钢¹, 王伟露^1,3

¹土壤与农业可持续发展国家重点实验室/中国科学院南京土壤研究所, 南京 210008;
²安徽省养分循环与资源环境省级实验室/安徽省农业科学院土壤肥料研究所, 合肥 230031;
³中国科学院大学, 北京 100049

收稿日期:2017-01-24 出版日期:2018-01-18 发布日期:2018-01-18
通讯作者: * E-mail: jgzhu@issas.ac.cn
作者简介:袁嫚嫚,女,1983年生,博士研究生. 主要从事生态环境与农业资源研究. E-mail: mmyuan@issas.ac.cn
基金资助:
本文由国家自然科学基金国际(地区)合作与交流项目(31261140364)和科技部国际合作与交流项目(2010DFA22770)资助

Responses of diurnal variation of flag-leaf photosynthesis and photosynthetic pigment content to elevated atmospheric CO₂ concentration and temperature of Japonica rice during late growth stage: A FACE study.

YUAN Man-man^1,2,3, ZHU Jian-guo^1*, LIU Gang¹, WANG Wei-lu^1,3

¹State Key Laboratory of Soil and Sustainable Agriculture/Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;
²Laboratory of Nutrient Cycling, Resources and Environment of Anhui/Institute of Soil and Fertilizer, Anhui Academy of Agricultural Sciences, Hefei 230031, China;
³University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-01-24 Online:2018-01-18 Published:2018-01-18
Contact: * E-mail: jgzhu@issas.ac.cn
Supported by:
This work was supported by the Fund for International Cooperation and Exchange of the National Natural Science Foundation of China (31261140364) and the International Cooperation and Exchange of Ministry of Science and Technology of China (2010DFA22770).

摘要/Abstract

摘要： 为研究水稻叶片光合色素和光合日变化对大气CO₂浓度和气温升高的响应,我们采用在开放空气中控制升高CO₂浓度和温度的方法,以常规粳稻南粳9108为试验材料,设置了环境CO₂和高大气CO₂浓度(增加200 μmol·mol^-1)、环境温度和增温(增加1～2 ℃)交互的4个处理,测定了灌浆中期和后期水稻剑叶的光合日变化特征和光合色素含量.结果表明: 水稻剑叶净光合速率(P_n)为双峰曲线,发生了光合“午休”现象;大气CO₂浓度升高提高了剑叶P_n,灌浆中期和后期平均分别增加了47.6%和39.1%;高温有降低P_n的趋势,但相关性未达到显著水平.大气CO₂浓度和温度升高导致水稻剑叶生育后期气孔导度(g_s)平均分别降低了17.0%和11.8%.高CO₂浓度水稻剑叶生育后期蒸腾速率(T_r)、叶绿素a、叶绿素b、类胡萝卜素、总叶绿素和叶绿素a/b值显著降低,平均降幅分别为5.9%、50.4%、21.3%、41.4%、39.4%和21.4%,明显增加了剑叶水分利用率(WUE),平均增幅达47.9%.与之相反,生育后期增温使水稻剑叶T_r增加了10.2%,使WUE平均降低了20.4%.综上所述,大气CO₂浓度升高对粳稻生育后期剑叶P_n、g_s和光合色素含量的影响明显大于增温效应.因此,应重视大气CO₂浓度和温度对水稻光合作用和光合色素的综合效应,减弱增温的负效应.

Abstract: A local popular Japonica rice (Oryza sating L.) cultivar, Nanjing 9108, was tested with free air controlled enrichment (FACE) approach to study the responses of photosynthetic pigment content and diurnal variation of flag-leaf photosynthesis to elevated atmospheric CO₂ concentration and temperature. Four alternative treatments were designed with two CO₂ concentration levels (ambient and elevated 200 μmol·mol^-1) and two air temperature regimes (ambient and elevated 1-2 ℃). Diurnal variation of flag-leaf photosynthesis was measured in the middle full stage and the late full stage, and photosynthetic pigment of the leaf was analyzed afterward. Results showed that diurnal variation of net photosynthetic rate (P_n) in each treatment followed a double-peak curve with midday depression feature during late growth stage. Compared to P_n under ambient condition, P_n under elevated CO₂ concentration increased by 47.6% and 39.1% on average at middle full stage and late full stage, respectively. There was a negative correlation between temperature and P_n with no significance. Both elevated CO₂ concentration and temperature had a significant negative effect on stomatal conductance (g_s), decreased by 17.0% and 11.8% on average, respectively. Elevated CO₂ concentration significantly reduced transpiration rate (T_r), chlorophyll a (Chl a), chlorophyll b (Chl b), carotene (Car), total chlorophyll (Chl t) and chlorophyll a/b ratio (Chl a/b) during late growth stage of rice by 5.9%, 50.4%, 21.3%, 41.4%, 39.4% and 21.4% on average, respectively, whereas water use efficiency (WUE) increased by 47.9%. However, there were opposite effects on T_r, WUE and photosynthetic pigment content under elevated temperature, with T_r increased by 10.2% and WUE decreased by 20.4%. It could be concluded that elevated CO₂ concentration had a greater effect on P_n, g_s and photosynthetic pigment content of rice leaf than elevated temperature did during late growth stage. Therefore, it should be paid more attention to the colligate effects of elevated CO₂ concentration and high temperature on photosynthesis and photosynthetic pigment content to reduce negative effect of high air temperature.

袁嫚嫚, 朱建国, 刘钢, 王伟露. 粳稻生育后期剑叶光合日变化和光合色素对大气CO₂浓度和温度升高的响应——FACE研究[J]. 应用生态学报, 2018, 29(1): 167-175.

YUAN Man-man, ZHU Jian-guo, LIU Gang, WANG Wei-lu. Responses of diurnal variation of flag-leaf photosynthesis and photosynthetic pigment content to elevated atmospheric CO₂ concentration and temperature of Japonica rice during late growth stage: A FACE study.[J]. Chinese Journal of Applied Ecology, 2018, 29(1): 167-175.

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粳稻生育后期剑叶光合日变化和光合色素对大气CO₂浓度和温度升高的响应——FACE研究

Responses of diurnal variation of flag-leaf photosynthesis and photosynthetic pigment content to elevated atmospheric CO₂ concentration and temperature of Japonica rice during late growth stage: A FACE study.

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