文献类型：期刊文献

中文题名：苜蓿茎点霉对紫花苜蓿光合生理的影响

英文题名：The effect of Phoma medicaginis on the photosynthetic physiology of Medicago sativa

作者：樊秦[1,2];李彦忠[1,3]

第一作者：樊秦

机构：[1]草地农业生态系统国家重点实验室,兰州大学草地农业科技学院,甘肃兰州730020;[2]甘肃中医药大学,甘肃兰州730000;[3]中国农业科学院草原研究所,内蒙古呼和浩特010010

第一机构：草地农业生态系统国家重点实验室,兰州大学草地农业科技学院,甘肃兰州730020

年份：2017

卷号：26

期号：1

起止页码：112

中文期刊名：草业学报

外文期刊名：Acta Prataculturae Sinica

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2017_2018】；

基金：公益性行业(农业)科研专项(201303057);国家牧草产业技术体系(CARS-35);国家自然科学基金(31272496)资助

语种：中文

中文关键词：紫花苜蓿;苜蓿茎点霉;叶绿素荧光;光合响应曲线;CO2响应曲线

外文关键词：Medicago sativa; Phoma medicaginis;chlorophyll fluorescence; photosynthesis response curve; CO2 response curve

摘要：苜蓿茎点霉侵染紫花苜蓿后严重影响其产量和质量。本研究采用植物生长室盆栽法,利用光合作用测量系统研究苜蓿茎点霉对紫花苜蓿叶片光合生理的影响。结果表明,除侵染第27天外,苜蓿茎点霉使紫花苜蓿叶片净光合速率(Pn)、气孔导度(Gs)和蒸腾速率(Tr)降低,对胞间二氧化碳浓度(Ci)在侵染前期影响不大。在侵染至23d,紫花苜蓿叶片光化学量子效率(Fv/Fm)、PSⅡ反应中心激发能捕获效率(Fv′/Fm′)、PSⅡ反应中心电荷分离实际量子效率(ΦPSⅡ)、电子传递速率(ETR)、光化学猝灭系数(qP)和非光化学淬灭系数(qN)显著降低。光补偿点(LCP)、CO2补偿点(CCP)和羧化效率(CE)降低。表明苜蓿茎点霉通过降低紫花苜蓿叶片中光合电子传递率捕获效率、非光化学猝灭系数(qN)和羧化效率(CE),而产生光抑制,使CO2的同化作用降低,影响紫花苜蓿的生长发育。
The yield and quality of Medicago sativa are seriously affected by the fungal pathogen Phoma medi- caginis. A study has been undertaken using growth chamber pot experiments and the LI-6400/XT photosynthesis measurement system to investigate the effects of this pathogen on the photosynthetic physiology of M. sativa. The results showed that until 27 days post-inoculation （dpi） the net photosynthetic rate （Pn）, stomatal conductance （Gs） and transpiration rate （Tr） of M. sativa were reduced by P. medicaginis infection. In the early stages of infection there were little changes in intercellular CO2 concentration （Ci） in the leaves. By 23 dpi, infected leaves showed significant reductions in photochemical quantum efficiency （Fv/Fm）, PS Ⅱ reaction center of excitation energy capture efficiency （Fv＇/Fm＇）, the relative quantum efficiency of PSⅡ photochemis- try （ФesⅡ）, electron transfer rate （ETR）, photochemical quenching （qP） and non-photochemical quenching （qN）. Light compensation point, CO2 compensation point and carboxylation efficiency （CE） also decreased. The results indicate that the photosynthetic electron transfer rate and capture efficiency, non-photochemical quenching （qN）, and carhoxylation efficiency （CE） decreased in leaves infected by P. medicaginis, leading to light suppression and a decrease in the assimilation of CO2 that affect the growth and development of M. sativa.