Differentially-expressed genes related to glutathione metabolism and heavy metal transport reveals an adaptive, genotype-specific mechanism to Hg2+exposure in rice (Oryza sativa L.)
文献类型： 外文期刊
作者： Wang, Shufeng 1 ; Yao, Hesheng 2 ; Li, Lingyi 2 ; Du, Hongxia 3 ; Guo, Pan 1 ; Wang, Dingyong 4 ; Rennenberg, Heinz 1 ; Ma, Ming 1 ;
作者机构： 1.Southwest Univ, Coll Resources & Environm, Ctr Mol Ecophysiol CMEP, Chongqing 400715, Peoples R China
2.Southwest Univ, Coll Agron & Biotechnol, Chongqing 400715, Peoples R China
3.Southwest Univ, Coll Resources & Environm, Chongqing Key Lab Bioresource Bioenergy, Chongqing 400715, Peoples R China
4.Coll Resources & Environm, Chongqing Key Lab Agr Resources & Environm, Chongqing 400715, Peoples R China
关键词： Mercury; Accumulation; Tolerance; Antioxidant system; Differentially expressed genes (DEGs)
期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：7.6； 五年影响因子：8.3 ）
ISSN： 0269-7491
年卷期： 2023 年 324 卷
页码：
收录情况： SCI
摘要： Rice consumption is an essential cause of mercury (Hg) exposure for humans in Asia. However, the mechanism of Hg transport and accumulation in rice plants (Oryza sativa L.) remains unclear. Here, rice genotypes with contrasting Hg uptake and translocation abilities, i.e. H655 (high Hg-accumulator) and H767 (low Hg-accumulator), were selected from 261 genotypes. Through comparative physiological and transcriptome analyses, we investigated the processes responsible for the relationship between Hg accumulation, transport and tolerance. The results showed significant stimulation of antioxidative metabolism, particularly glutathione (GSH) accumulation, and up-regulated expression of regulatory genes of glutathione metabolism for H655, but not for H767. In addition, up-regulated expression of GSH S-transferase (GST) and OsPCS1 in H655 that catalyzes the binding of Hg and GSH, enhances the Hg detoxification capacity, while high-level expression of YSL2 in H655 enhances the transport ability for Hg. Conclusively, Hg accumulation in rice is a consequence of enhanced expression of genes related to Hg binding with GSH and Hg transport. With these results, the present study contributes to the selection of rice genotypes with limited Hg accumulation and to the mitigation of Hg migration in food chains thereby enhancing nutritional safety of Hg-polluted rice fields.
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