Association of polygalacturonase-inhibiting protein gene 2 (MsPGIP2) to common leaf spot resistance in alfalfa

文献类型： 外文期刊

第一作者： Gui, Zhi

作者： Gui, Zhi;Gao, Jianming;Xin, Nan;Pi, Yongshuo;Liu, Huiqin;Gui, Zhi;Gao, Jianming;Wang, Yu;Yuan, Qinghua;Li, Xianglin

作者机构：

关键词： Lucerne;PGIPs;Association;Common leaf spot;SNPs;FSSCP

期刊名称：EUROPEAN JOURNAL OF PLANT PATHOLOGY （ 影响因子：1.907； 五年影响因子：2.022 ）

ISSN：

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收录情况： SCI

摘要： Common leaf spot (CLS), which is caused by Pseudopeziza medicaginis (Lib.) Sacc., is one of the most serious fungal diseases occurring in autotetraploid alfalfa (Medicago sativa) worldwide. Polygalacturonase-inhibiting proteins (PGIPs) are important candidate genes for disease resistance studies in plants. The association between an alfalfa PGIP gene, MsPGIP2, and the CLS resistance of alfalfa was tested using a population including 400 plants from 16 cultivars. Direct sequencing detected 21 single-nucleotide polymorphisms (SNPs) with a genotypic frequency > 0.1 over the sequenced fragment of about 635 bp. Linkage disequilibrium (LD) within this region rapidly decreased as expected and no evident structure among the studied population was observed. Two synonymous coding-region SNPs, L458 and L563, revealed weak but significant associations to the CLS resistance, mainly impacting on the spot size. Furthermore, L458 exhibited a greater effect on CLS severity than L563. Fluorescent single-strand conformational polymorphism (FSSCP) marker S331a was found to be associated to CLS resistance, and exclusively contained a favourable base to the CLS resistance in L458. Thus, MsPGIP2 could play a small role in CLS resistance of alfalfa by limiting the extension of disease spots. FSSCP marker S331a could be useful for marker-assisted selection of L458.

分类号： S432.1

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