文献类型： 外文期刊

作者： Yu, C. ¹ ; Lv, D. G. ¹ ; Qin, S. J. ¹ ; Yang, L. ¹ ; Ma, H. Y. ¹ ; Liu, G. C. ¹ ;

作者机构： 1.Shenyang Agr Univ, Coll Hort, Shenyang 110161, Peoples R China

2.Hubei Acad Agr Sci, Cash Crops Inst, Wuhan 430064, Peoples R China

关键词： nitrate reductase;stomatal conductance;chlorophyll fluorescence;leaf nitrogen content;net photosynthetic rate;soluble protein content;transpiration rate;Internet resource.

期刊名称：PHOTOSYNTHETICA （ 2020影响因子：3.189； 五年影响因子：3.38 ）

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收录情况： SCI

摘要： Photosynthesis, chlorophyll (Chl) a fluorescence, and nitrogen metabolism of hawthorn (Crataegus pinnatifida Bge.), subjected to exogenous L-glutamic acid (GLA) (200 mg lp#, 400 mg lp#, and 800 mg lp#) that possibly affect secondary metabolic regulation, were measured. The results indicated that photosynthetic and fluorescence characteristics of hawthorn exhibited positive responses to the application of GLA. Different concentrations of GLA caused an increase in Chl content, net photosynthetic rate (P N) and stomatal conductance (g s) as well as transpiration rate (E), and improved the carboxylation efficiency (CE), apparent quantum yield (AQY) and maximum carboxylation velocity of Rubisco (Vcmax). Application of GLA could also enhance the maximum ratio of quantum yields of photochemical and concurrent non-photochemical processes in PSII (Fv/F), the maximal quantum yield of PSII (Fv/Fm), the probability that an absorbed photon will move an electron into the electron transport chain beyond QA (EEo) as well as the performance index on absorption basis (PIABS), but decreased the intercellular CO concentration (C i) and the minimal fluorescence (F). Application of GLA also induced an increase in nitrate reductase (NR; EC 1.6.6.1) and glutamine synthetase (GS; EC 6.3.1.2) activities, and increased the soluble protein content, leaf nitrogen (N) content and N accumulation in leaves as well as the plant biomass. However, the effects were different among different concentrations of GLA, and 800 mg lp# GLA was better. This finding suggested that application of GLA is recommended to improve the photosynthetic capacity by increasing the light energy conversion and CO transfer as well as the photochemical efficiency of PSII, and enhanced the nitrogen metabolism and growth and development of plants.