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Journal of Integrative Agriculture  2018, Vol. 17 Issue (10): 2151-2159    DOI: 10.1016/S2095-3119(18)62038-6
Special Focus: Beneficial roles silicon plays in agriculture Advanced Online Publication | Current Issue | Archive | Adv Search |
Beneficial effects of silicon on photosynthesis of tomato seedlings under water stress
ZHANG Yi1*, SHI Yu1*, GONG Hai-jun2, ZHAO Hai-liang1, LI Huan-li2, HU Yan-hong2, WANG Yi-chao2 
 
 
1 College of Horticulture, Shanxi Agricultural University, Taigu 030801, P.R.China
2 College of Horticulture, Northwest A&F University, Yangling 712100, P.R.China
 
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Abstract  Silicon can improve drought tolerance of plants, but the mechanism still remains unclear.  Previous studies have mainly concentrated on silicon-accumulating plants, whereas less work has been conducted in silicon-excluding plants, such as tomato (Solanum lycopersicum L.).  In this study, we investigated the effects of exogenous silicon (2.5 mmol L–1) on the chlorophyll fluorescence and expression of photosynthesis-related genes in tomato seedlings (Zhongza 9) under water stress induced by 10% (w/v) polyethylene glycol (PEG-6000).  The results showed that under water stress, the growth of shoot and root was inhibited, and the chlorophyll and carotenoid concentrations were decreased, while silicon addition improved the plant growth and increased the concentrations of chlorophyll and carotenoid.  Under water sterss, chlorophyll fluorescence parameters such as PSII maximum photochemical efficiency (Fv/Fm), effective quantum efficiency, actual photochemical quantum efficiency (ФPSII), photosynthetic electron transport rate (ETR), and photochemical quenching coefficient (qP) were decreased; while these changes were reversed in the presence of added silicon.  The expressions of some photosynthesis-related genes including PetE, PetF, PsbP, PsbQ, PsbW, and Psb28 were down-regulated under water stress, and exogenous Si could partially up-regulate their expressions.  These results suggest that silicon plays a role in the alleviation of water stress by modulating some photosynthesis-related genes and regulating the photochemical process, and thus promoting photosynthesis.
 
 
Keywords:  tomato        water stress        silicon        photosynthesis  
Received: 12 March 2018   Accepted:
Fund: The study was funded by the National Natural Science Foundation of China (31501750, 31501807, 31471866, 31772290).
Corresponding Authors:  Correspondence SHI Yu, Mobile: +86-18235419551, E-mail: ayu-shi@163.com    
About author:  ZHANG Yi, Mobile: +86-18404969601, E-mail: harmony1228 @163.com; * These authors contributed equally to this study.

Cite this article: 

ZHANG Yi, SHI Yu, GONG Hai-jun, ZHAO Hai-liang, LI Huan-li, HU Yan-hong, WANG Yi-chao. 2018. Beneficial effects of silicon on photosynthesis of tomato seedlings under water stress. Journal of Integrative Agriculture, 17(10): 2151-2159.

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