Comparative Transcriptomics of Lowland Rice Varieties Uncovers Novel Candidate Genes for Adaptive Iron Excess Tolerance

文献类型： 外文期刊

第一作者： Kar, Saradia

作者： Kar, Saradia;Mai, Hans-Joerg;Khalouf, Hadeel;Ben Abdallah, Heithem;Bauer, Petra;Kar, Saradia;Panda, Sanjib Kumar;Flachbart, Samantha;Fink-Straube, Claudia;Braeutigam, Andrea;Xiong, Guosheng;Shang, Lianguang;Panda, Sanjib Kumar;Bauer, Petra

作者机构：

关键词： Iron toxicity; Iron uptake; Leaf bronzing; Metal homeostasis; Oryza sativa; Oxidative stress; Rice; RNA sequencing; Susceptible; Tolerant

期刊名称：PLANT AND CELL PHYSIOLOGY （ 影响因子：4.937； 五年影响因子：5.783 ）

ISSN： 0032-0781

年卷期： 2021 年 62 卷 4 期

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收录情况： SCI

摘要： Iron (Fe) toxicity is a major challenge for plant cultivation in acidic waterlogged soil environments, where lowland rice is a major staple food crop. Only few studies have addressed the molecular characterization of excess Fe tolerance in rice, and these highlight different mechanisms for Fe tolerance. Out of 16 lowland rice varieties, we identified a pair of contrasting lines, Fe-tolerant Lachit and -susceptible Hacha. The two lines differed in their physiological and morphological responses to excess Fe, including leaf growth, leaf rolling, reactive oxygen species generation and Fe and metal contents. These responses were likely due to genetic origin as they were mirrored by differential gene expression patterns, obtained through RNA sequencing, and corresponding gene ontology term enrichment in tolerant vs. susceptible lines. Thirty-five genes of the metal homeostasis category, mainly root expressed, showed differential transcriptomic profiles suggestive of an induced tolerance mechanism. Twenty-two out of these 35 metal homeostasis genes were present in selection sweep genomic regions, in breeding signatures, and/or differentiated during rice domestication. These findings suggest that Fe excess tolerance is an important trait in the domestication of lowland rice, and the identified genes may further serve to design the targeted Fe tolerance breeding of rice crops.

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