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Transgenerational memory of gene expression changes induced by heavy metal stress in rice (Oryza sativa L.)

文献类型： 外文期刊

作者： Cong, Weixuan 1 ; Miao, Yiling 1 ; Xu, Lei 1 ; Zhang, Yunhong 1 ; Yuan, Chunlei 1 ; Wang, Junmeng 1 ; Zhuang, Tingting 1 ;

作者机构： 1.Northeast Normal Univ, Key Lab Mol Epigenet MOE, Changchun 130024, Jilin, Peoples R China

2.Northeast Normal Univ, Inst Cytol & Genet, Changchun 130024, Jilin, Peoples R China

3.Jilin Acad Agr Sci, Changchun 130033, Jilin, Peoples R China

4.Jilin Agr Univ, Changchun 130000, Jilin, Peoples R China

5.Washington State Univ, Dept Crop & Soil Sci, Pullman, WA 99164 USA

6.Clemson Univ, Dept Plant & Environm Sci, Pee Dee Res & Educ Ctr, Florence, SC 29506 USA

关键词： Heavy metal stress; Transgenerational memory; Gene expression; DNA methylation

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2019 年 19 卷

页码：

收录情况： SCI

摘要： Background: Heavy metal toxicity has become a major threat to sustainable crop production worldwide. Thus, considerable interest has been placed on deciphering the mechanisms that allow plants to combat heavy metal stress. Strategies to deal with heavy metals are largely focused on detoxification, transport and/or sequestration. The P-1B subfamily of the Heavy Metal-transporting P-type ATPases (HMAs) was shown to play a crucial role in the uptake and translocation of heavy metals in plants. Here, we report the locus-specific expression changes in the rice HMA genes together with several low-copy cellular genes and transposable elements upon the heavy metal treatment and monitored the transgenerational inheritance of the altered expression states. We reveal that plants cope with heavy metal stress by making heritable changes in gene expression and further determined gene-specific responses to heavy metal stress. Results: We found most HMA genes were upregulated in response to heavy metal stress, and furthermore found evidence of transgenerational memory via changes in gene regulation even after the removal of heavy metals. To explore whether DNA methylation was also altered in response to the heavy metal stress, we selected a Tos17 retrotransposon for bisulfite sequencing and studied its methylation state across three generations. We found the DNA methylation state of Tos17 was altered in response to the heavy metal stress and showed transgenerational inheritance. Conclusions; Collectively, the present study elucidates heritable changes in gene expression and DNA methylation in rice upon exposure to heavy metal stress and discusses implications of this knowledge in breeding for heavy metal tolerant crops.

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