数字农科院2.0

Genome-Wide Association Study Elucidates the Genetic Architecture of Manganese Tolerance in Brassica napus

文献类型： 外文期刊

作者： Raman, Harsh;Bai, Zetao;Mcvittie, Brett;Mukherjee, Sourav;Goold, Hugh D.;Zhang, Yuanyuan;Khin, Nay Chi;Qiu, Yu;Shamaya, Nawar;Liu, Shengyi;Delourme, Regine;Pogson, Barry J.;Balasubramanian, Sureshkumar;Raman, Rosy

作者机构：

关键词： canola;genetic architecture;GWAS;manganese tolerance;soil acidity;yeast and ectopic expression

期刊名称： PLANT CELL AND ENVIRONMENT

ISSN： 0140-7791

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Brassica napus (canola) is a significant contributor to the world's oil production and is cultivated across continents, yet acidic soils with aluminium (Al3+) and manganese (Mn2+) toxicities limit its production. The genetic determinants underlying natural variation for acidic soil tolerance in canola are unknown and need to be determined. Through genome-wide association analysis of 326 canola accessions, we identified three QTLs for tolerance to Mn2+ toxicity on chromosomes A09, C03, and C09. Allelism tests between four tolerance sources confirmed that at least one locus on A09 controls Mn2+ tolerance in canola. Integrated analyses of genomic and expression QTL and Mn2+ tolerance data revealed that BnMTP8.A09, possibly in conjunction with BnMATE.C03, BnMTP8.C04 and BnMTP8.C08, play a central role in conferring Mn2+ tolerance in canola. Gene expression analysis showed that variation in BnMTP8.A09 expression could account for upto 74% of the variation in Mn2+ tolerance between individuals with extreme phenotypes. Yeast complementation assays and ectopic expression in Arabidopsis show that BnMTP8.A09 can complement manganese-hypersensitive yeast mutant strain PMR1 triangle and Arabidopsis atmtp8 mutant background, respectively and restore Mn2+ tolerance to wild-type levels. Our multi-omics research approach unveils the genetic architecture of Mn2+ tolerance and identifies BnMTP8.A09 as a causal gene imparting tolerance to Mn2+ toxicity in canola.

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