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Effects of 5-aminolevulinic acid treatment on photosynthesis of strawberry

文献类型： 外文期刊

作者： Sun, Y. P. 1 ; Liu, J. 3 ; Cao, R. X. 1 ; Huang, Y. J. 2 ; Hall, A. M. 2 ; Guo, C. B. 1 ; Wang, L. J. 3 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Nanjing Agr Sci, Nanjing 210046, Jiangsu, Peoples R China

2.Univ Hertfordshire, Dept Biol & Environm Sci, Hatfield AL10 9AB, Herts, England

3.Nanjing Agr Univ, Coll Hort, Nanjing 210095, Jiangsu, Peoples R China

关键词： chlorophyll fluorescence;gas exchange;heat phase;photochemical phase;photosystem I;photosystem II

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

ISSN：

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收录情况： SCI

摘要： Effects of root treatment with 5-aminolevulinic acid (ALA) on leaf photosynthesis in strawberry (Fragaria ananassa Duch.) plants were investigated by rapid chlorophyll fluorescence and modulated 820 nm reflection using 3-(3,4-dichlorophenyl)-1,1-dimethyl urea (DCMU) and methyl viologen (MV). Our results showed that ALA treatments increased the net photosynthetic rate and decreased the intercelluar CO2 concentration in strawberry leaves. Under DCMU treatment, trapping energy for Q(A) reduction per PSII reaction center increased greatly, indicating DCMU inhibited electron transfer from Q(A) (-). The maximum photochemical efficiency of PSII (F-v/F-m) decreased under the DCMU treatment, while a higher F-v/F-m remained in the ALA-pretreated plants. Not only the parameters related to a photochemical phase, but also that one related to a heat phase remained lower after the ALA pretreatment, compared to the sole DCMU treatment. The MV treatment decreased PSI photochemical capacity. The results of modulated 820 nm reflection analysis showed that DCMU and MV treatments had low re-reduction of P700 and plastocyanin (PSI). However, the strawberry leaf discs pretreated with ALA exhibited high re-reduction of PSI under DCMU and MV treatments. The results of this study suggest that the improvement of photosynthesis by ALA in strawberry was not only related to PSII, but also to PSI and electron transfer chain.

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