数字农科院2.0

Identification Of Genome-Wide Single-Nucleotide Polymorphisms (.Snps) Associated With Tolerance T o Chromium Toxicity In Spring Wheat (Triticum Aestivum L.)

文献类型： 外文期刊

作者： Almas, F; Hassan, A; Bibi, A; Ali, M; Lateef, S; Mahmood, T; Rasheed, A; Quraishi, UM

作者机构：

关键词： Chromium; Toxicity; Bread wheat; Single nucleotide polymorphism; Association mapping

期刊名称： PLANT AND SOIL

ISSN： 0032-079X

年卷期： 2018 年 422 卷

页码：

收录情况： JCR（2021版）

摘要： Chromium (Cr) toxicity is a rapidly increasing environmental concern and poses a major threat to plant growth as well as food chain. This study was carried out to screen spring wheat diversity panel against Cr toxicity to assess yield reduction, grain contamination extents and genomic regions associated with tolerance to Cr toxicity. The diversity panel was planted in control and Cr stress (26 mg Cr/kg soil) in paved plots, and several morphological and physiological traits were recorded. Wheat 90 K Infinium iSelect SNP array was used to identify genomic regions underpinning tolerance to Cr toxicity. Some wheat cultivars (Khosar-95, Miraj-08, Millet-11, Sarsabaz and NARC-11) had Cr concentration within international edible threshold limit (1 ppm), but showed greater reduction to grain yield (63-95%) due to higher leaf Cr concentrations (2.35-8.95 ppm). Contrastingly, wheat cultivars Auqab-00 and Pakistan-13 had lower yield reduction up to 9% and 39%, respectively but had higher concentration of Cr in seeds (2.1 and 3.5 ppm, respectively). Genome-wide association studies identified 71 loci linked with yield related traits under Cr stress and 48 loci for differences between control and Cr stress treatments. Further, gene ontology of trait-associated SNPs revealed proteins with significant importance in plant development and tolerance against heavy metal stress. To our knowledge, this is the first study for identification of genomic regions linked to Cr stress, suggesting that this could be useful to identify complex architecture of genetic factors as well as molecular breeding opportunities for tolerance to Cr stress.

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