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高CO2浓度对不同氮素供给形态下水稻叶片光合作用的影响
蔡颖1,2, 张继双1,2, 蔡创1, 朱春梧1
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.中国科学院大学, 北京 100049
摘要:
为探究水稻叶片光合作用对高CO2浓度([CO2])的响应是否与氮素供给形态有关,利用人工气候生长箱,以粳稻(武运粳23号和淮稻5号)、籼稻(扬稻6号)和杂交稻(Y-两优6号)为试验材料,设置主处理:大气[CO2]和高[CO2]处理(+200 μmol/mol),副处理:硝态氮和铵态氮处理,测定水稻新展开完全叶片的光合作用。试验结果表明:高[CO2]会增加硝态氮处理下粳稻和杂交稻叶片的净光合速率(Pn)、铵态氮处理下粳稻武运粳23号叶片Pn以及各氮素供给形态下水稻叶片胞间[CO2](Ci)和水分利用效率(WUE),其中在硝态氮处理下Pn和WUE的响应要高于铵态氮处理;高[CO2]会降低水稻叶片的气孔导度(gs)和蒸腾速率(Tr),其中在硝态氮处理下粳稻gsTr的响应要高于籼稻,而在铵态氮处理下高[CO2]对杂交稻gsTr的影响要高于粳稻和籼稻。可见,不同的氮素供给形态会影响水稻叶片的光合作用对高[CO2]的响应,且这种影响在水稻品种间存在很大差异。
关键词:  高CO2浓度  氮素供给形态  水稻  光合作用
DOI:10.13758/j.cnki.tr.2021.02.007
分类号:S-3;S511.01
基金项目:中国科学院基础前沿科学研究计划从0到1原始创新项目(ZDBS-LY-DQC020)、国家自然科学基金项目(31870423)和江苏省自然科学基金项目(BK2018402)资助。
Effects of Elevated CO2 Concentration on Photosynthesis of Rice Leaves Under Different Nitrogen Supply Forms
CAI Ying1,2, ZHANG Jishuang1,2, CAI Chuang1, ZHU Chunwu1
1.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;2.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
In order to investigate whether the response of photosynthesis of rice leaves to elevated CO2 concentration ([CO2]) is related to nitrogen supply forms, artificial climate growth chambers were used for observing the photosynthesis of newly developed leaves of rice cultivars (japonica rice cultivars:Wuyunjing 23 (WYJ) and Huaidao 5 (HD), indica rice cultivar:Yangdao 6 (YD), and hybrid rice cultivar:Y-Liangyou 6 (Y-LY)) with four treatments (main treatment:ambient[CO2] and elevated[CO2] (+200 μmol/mol), and secondary treatment:nitrate nitrogen and ammonium nitrogen supply). The results showed that elevated[CO2] increased net photosynthetic rate (Pn) of WYJ, HD and Y-LY leaves under nitrate nitrogen treatment and WYJ leaves under ammonium nitrogen treatment, and intercellular[CO2] (Ci) and water use efficiency (WUE) of rice leaves under different Nitrogen supply forms, and the responses of Pn and WUE under nitrate nitrogen treatment were higher than those under ammonium nitrogen treatment. In addition, elevated[CO2] reduced stomatal conductance (gs) and transpiration rate (Tr) of rice leaves, and the responses of gs and Tr of japonica rice cultivars (WYJ and HD) treated with nitrate nitrogen were greater than those of indica rice (YD), and the responses of gs and Tr of hybrid rice cultivar (Y-LY) treated with ammonium nitrogen was greater than those of japonica and indica rice cultivars. The above results indicate that different Nitrogen supply forms can affect the response of photosynthesis of rice leaves to elevated[CO2], and this effect varies widely among rice cultivars.
Key words:  Elevated CO2 concentration  Nitrogen supply forms  Rice  Photosynthesis

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