Silicon ameliorates manganese toxicity by regulating physiological processes and expression of genes associated with photosynthesis in rice (Oryza sativa L.)

Article


Li, Ping, Song, Alin, Li, Zhaojun, Fan, Fenliang and Liang, Yongchao. 2015. "Silicon ameliorates manganese toxicity by regulating physiological processes and expression of genes associated with photosynthesis in rice (Oryza sativa L.) ." Plant and Soil: international journal on plant-soil relationships. 397 (1-2), pp. 289-301. https://doi.org/10.1007/s11104-015-2626-y
Article Title

Silicon ameliorates manganese toxicity by regulating physiological processes and expression of genes associated with photosynthesis in rice (Oryza sativa L.)

ERA Journal ID2642
Article CategoryArticle
AuthorsLi, Ping (Author), Song, Alin (Author), Li, Zhaojun (Author), Fan, Fenliang (Author) and Liang, Yongchao (Author)
Journal TitlePlant and Soil: international journal on plant-soil relationships
Journal Citation397 (1-2), pp. 289-301
Number of Pages13
Year2015
PublisherSpringer
Place of PublicationNetherlands
ISSN0032-079X
1573-5036
Digital Object Identifier (DOI)https://doi.org/10.1007/s11104-015-2626-y
Web Address (URL)http://link.springer.com/article/10.1007%2Fs11104-015-2626-y
Abstract

Background and aims: We investigated the effects of silicon (Si) on chlorophyll concentration, photosynthesis, leaf chloroplast ultrastructure, and expression of genes involved in photosynthesis to elucidate the mechanisms through which Si mediated alleviation of manganese (Mn) toxicity in rice (Oryza sativa L.).

Methods: Rice seedlings were grown hydroponically with normal Mn (6.7 μM) or high Mn (2 mM) concentrations, both with (1.5 mM) and without Si supplementation. Leaf chloroplast ultrastructure was observed by scanning and transmission electron microscopy. Differentially expressed genes relating to photosynthesis were identified by highthroughput sequencing, and their relative expression levels were evaluated by real-time quantitative PCR.

Results: Chlorophyll and carotenoid concentrations and net photosynthesis decreased with chloroplast degradation under high Mn stress. High Mn concentrations may have inhibited photosynthesis through several mechanisms, including suppressing chlorophyll and ATP synthesis, decreasing light-harvesting processes, impairing photosystem I (PSI) stability and structure, and slowing activity of phosphoribulokinase. Si enhanced Mn tolerance efficiently by increasing chlorophyll concentration, light-use efficiency,and ATP concentration aswell as by stabilizing the structure of PSI and promoting CO2 assimilation.

Conclusions Our findings suggest active involvement of Si in Mn detoxification, ranging from physiological responses to gene expression.

Keywordsgene expression; Mn toxicity; photosynthesis; rice; silicon
ANZSRC Field of Research 2020410605. Soil physics
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Byline AffiliationsChinese Academy of Agricultural Sciences, China
Institution of OriginUniversity of Southern Queensland
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