摘要
为阐明氮肥和CO2浓度升高互作对谷子光合生理特性与产量构成因素的影响,客观评估气候变化背景下谷子的生产潜力,采用开顶式人工气候室和盆栽方法,在不同供氮水平(低氮为0 g/kg;高氮为0.2 g/kg)与不同CO2浓度(大气CO2浓度为400μmol/mol;高CO2浓度为600μmol/mol)下测定谷子拔节期与抽穗期的光合特性、叶片性状以及收获后籽粒产量构成因素参数。结果表明,2种CO2浓度下,氮素胁迫均显著降低了谷子叶片比叶质量与叶氮含量,但在高CO2浓度下,谷子叶片净光合速率(Pn)、叶绿素a含量、叶绿素b含量、叶绿素(a+b)含量、叶片单位横截面积的光能吸收(ABS/CSM)、QA还原(TRO/CSM)、单位面积电子传递的量子产额(ETO/CSM)以及PSII单位面积内反应中心的数量(RC/CSM)均较正常CO2浓度对氮素胁迫更加敏感;氮素胁迫显著抑制了正常CO2浓度下谷子植株的穗质量与穗粒质量,但对大气CO2浓度升高下的植株无显著抑制。总之,高浓度CO2下,谷子叶片光合性能较正常CO2浓度对氮素胁迫的响应更加敏感,但构成籽粒产量参数并未显著下降。
To illustrate the effects of the interaction of nitrogen(N)fertilizer and CO2 concentration(CO2)on photosynthetic performance and yield of foxtail millet(Setaria italica)and evaluate the potential productivity of foxtail millet under climate change enviroment,the photosynthetic characteristics,leaf traits and grain yield of foxtail millet at jointing and heading stages were studied under different N supply levels(low N,0 g/kg;high N,0.2 g/kg)and different CO2 concentrations(atmospheric CO2,400μmol/mol,elevated CO2,600μmol/mol).The results showed that N stress significantly inhibited specific leaf quality and leaf N concentration of foxtail millet,irrespective of CO2 concentrations.However,net photosynthetic rate(Pn),chlorophyll a,chlorophyll b,and chlorophyll a+b contents,light absorption per unit cross-sectional area(ABS/CSM),QA reduction(TRO/CSM),electron transfer efficiency(ETO/CSM)of reaction centers and the number of PSII reaction centers(RC/CSM)of plants with N stress were decreased more sharply under elevated CO2 than under atmospheric CO2.N stress significantly inhibited the spike weight and grain quality of plants under atmospheric CO2,but did not inhibit that of plants under elevated CO2.In conclusion,elevated CO2 could significantly decrease the photosynthetic performance of plants with N stress,but the grain yield didn't decrease significantly.
作者
梁煜
常翠翠
郝兴宇
张东升
王卫锋
高志强
宗毓铮
LIANG Yu;CHANG Cuicui;HAO Xingyu;ZHANG Dongsheng;WANG Weifeng;GAO Zhiqiang;ZONG Yuzheng(College of Agronomy,Shanxi Agricultural University,Taigu 030801,China;College of Forestry,Shanxi Agricultural University,Taigu 030801,China)
出处
《山西农业科学》
2020年第3期401-406,410,共7页
Journal of Shanxi Agricultural Sciences
基金
国家自然科学基金青年基金项目(31501276)
山西省应用基础研究项目(201701D221190,201601D021124)
山西农谷建设科研专项(SXNGJSKYZX201705)
山西农业大学青年拔尖创新人才支持计划项目(BJRC201602)。
关键词
高CO2浓度
谷子
氮素胁迫
快速荧光动力学参数
产量因素
elevated CO2 concentration
foxtail millet
nitrogen stress
rapid fluorescence kinetic parameters
yield components
