期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 107, 期 -, 页码 344-353出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2016.06.021
关键词
24-Epibrassinolide; Photosynthesis; Nitrogen metabolism; Low temperature and weak light; Tomato
资金
- Fundamental Research Funds for the Central Universities [6J0745]
- National Natural Science Foundation of China [31401919, 31471869, 31272209]
- China Postdoctoral Science Foundation [2014M561665]
- China Earmarked Fund for Modern Agro-industry Technology Research System [CARS-25-C-03]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- Research Fund for the Doctoral Program of Higher Education [20130097120015]
In the present study, we aimed to investigate the effects of exogenous 24-epibrassinolide (EBR) on growth, photosynthetic characteristics, chlorophyll fluorescence imaging, and nitrogen metabolism of tomato leaves under low temperature and weak light conditions. The results showed that foliar application of EBR significantly alleviated the inhibition of plant growth, and increased the fresh and dry weights of tomato plants under a combined low temperature and weak light stress. Moreover, EBR also increased the net photosynthetic rate (Pn), light saturation point (LSP), maximal quantum yield of PSII photochemistry (Fv/Fm), actual photochemical efficiency of PSII (OPSII), and photochemical quenching coefficient (qP), but decreased the intercellular CO2 concentration (Ci), light compensation point (LCP) and apparent quantum efficiency (AQE) under low temperature and weak light conditions. In addition, application of EBR to tomato leaves significantly enhanced the activities of nitrate reductase (NR), glutamate dehydrogenase (GDH), glutamine synthetase (GS), and glutamate synthase (GOGAT), but decreased the ammonium content and nitrite reductase (NiR) activity. We observed that EBR remarkably increased the contents of aspartic acid, threonine, serine, glycine, and phenylalanine, while decreasing the accumulation of cysteine, methionine, arginine, and proline under a combined low temperature and light stress. These results suggest that EBR could alleviate the combined stress-induced harmful effects on photosynthesis and nitrogen metabolism, thus leading to improved plant growth. (C) 2016 Published by Elsevier Masson SAS.
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