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高[CO2]对不同氮素形态下水稻叶片气体交换的影响
蔡颖, 张继双, 蔡创, 朱春梧
中国科学院南京土壤研究所
摘要:
为探究水稻叶片气体交换对高CO2浓度([CO2])的响应是否与氮素形态有关,本研究利用人工气候生长箱,以粳稻:武运粳23号(WYJ)和淮稻5号(HD)、籼稻:扬稻6号(YD)和杂交稻:Y-两优6号(Y-LY)为试验材料,主处理:大气[CO2]和高[CO2]处理(+200 μmol/mol),副处理:硝态氮(NO3-)和铵态氮(NH4+)处理,测定水稻新展开完全叶片的气体交换。试验结果表明:高[CO2]会增加WYJ、HD和Y-LY叶片的净光合速率(Pn)、SPAD(Soil and Plant Analyzer Development)值、叶片胞间[CO2](Ci)和水分利用率(WUE),其中在NO3-处理下Pn和WUE的响应要高于NH4+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NO3-处理下粳稻(WYJ和HD)gs和Tr的响应要高于籼稻(YD),而在NH4+处理下高[CO2]对杂交稻(Y-LY)gs和Tr的响应要高于粳稻和籼稻。以上结果表明,不同的氮素形态会影响水稻叶片的气体交换对高[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]  氮素形态  水稻  光合作用
DOI:
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 ),国家自然基金项目(31870423),江苏省自然基金(BK2018402)
Effect of elevated [CO2] on gas exchange of rice leaves under different nitrogen forms
caiying, zhangjishuang, caichuang, zhuchunwu
Institute of Soil Science, Chinese Academy of Sciences
Abstract:
In order to investigate whether the response of photosynthesis of rice leaves to elevated CO2 concentration ([CO2]) is related to nitrogen (N) forms, artificial climate growth chambers were used for observing the gas exchange 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 two treatments (main treatment:ambient [CO2] and elevated [CO2] (+200 μmol/mol), and secondary treatment: nitrate (NO3-) and ammonium (NH4+)). The results showed that elevated [CO2] increased net photosynthetic rate (Pn), SPAD(Soil and Plant Analyzer Development) value, intercellular [CO2] (Ci) and water use efficiency (WUE) of WYJ, HD and Y-LY leaves , and the response of Pn and WUE under NO3- treatment was higher than that NH4+ treatment. In addition, elevated [CO2] reduced stomatal conductance (gs) and transpiration rate (Tr) of rice leaves, and the response of gs and Tr of japonica rice cultivars (WYJ and HD) treated with NO3- were greater than indica rice (YD), and the response of gs and Tr of hybrid rice cultivar (Y-LY) treated with NH4+ was greater than japonica and indica rice cultivars. The above results indicated that different N forms could affect the response of gas exchange of rice leaves to elevated [CO2], and this effect varied widely among rice cultivars.
Key words:  elevated [CO2]  N forms  rice  photosynthesis

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