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《Acta Prataculturae Sinica》 2017-01
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The effect of Phoma medicaginis on the photosynthetic physiology of Medicago sativa

FAN Qin;LI Yan-Zhong;State Key Laboratory of Grassland Agro-ecosystems,College of Pastoral Agriculture Science and Technology,Lanzhou University;Gansu University of Chinese Medicine;Institute of Grassland Research,Chinese Academy of Agricultural Sciences;  
The yield and quality of Medicago sativa are seriously affected by the fungal pathogen Phoma medicaginis.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 CO_2concentration(Ci)in the leaves.By 23 dpi,infected leaves showed significant reductions in photochemical quantum efficiency(Fv/Fm),PSⅡreaction center of excitation energy capture efficiency(Fv′/Fm′),the relative quantum efficiency of PSⅡ photochemistry(ΦPSⅡ),electron transfer rate(ETR),photochemical quenching(qP)and non-photochemical quenching(qN).Light compensation point,CO_2 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 carboxylation efficiency(CE)decreased in leaves infected by P.medicaginis,leading tolight suppression and a decrease in the assimilation of CO_2 that affect the growth and development of M.sativa.
【Fund】: 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
【CateGory Index】: S541.9
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