文献类型： 外文期刊

作者： Zhao, Caimei ¹ ; Yin, Fuyou ² ; Chen, Ling ² ; Li, Dingqin ³ ; Xiao, Suqin ² ; Zhong, Qiaofang ² ; Wang, Bo ² ; Ke, Xue ² ; Fu, Jian ² ; Li, Xiang ⁴ ; Chen, Yue ² ; Wang, Lingxian ² ; Zhang, Dunyu ² ; Zhang, Yun ² ; Huang, Xingqi ¹ ; Cheng, Zaiquan ² ;

作者机构： 1.Yunnan Univ, Coll Life Sci, Kunming 650091, Yunnan, Peoples R China

2.Yunnan Acad Agr Sci, Biotechnol & Genet Germplasm Inst, Yunnan Prov Key Lab Agr Biotechnol, Minist Agr,Key Lab Southwestern Crop Gene Resourc, Kunming 650223, Yunnan, Peoples R China

3.Southwestern Med Univ, Basic Med Coll, Biochem Div, Luzhou 646000, Peoples R China

4.Yunnan Agr Univ, Coll Plant Protect, Kunming 650224, Yunnan, Peoples R China

关键词： Yunnan rice landraces; Bacterial blight; Resistance genes

期刊名称：AUSTRALASIAN PLANT PATHOLOGY （ 影响因子：1.4； 五年影响因子：1.651 ）

ISSN： 0815-3191

年卷期： 2022 年 51 卷 1 期

页码：

收录情况： SCI

摘要： Bacterial blight (BB), a serious bacterial disease caused by pathogen Xanthomonas oryzae pv. oryzae (Xoo) affects rice growth and yield. Yunnan Province is regarded as a center of rice diversity in China and indeed the world, and has abundant rice landrace resources, which may offer prospective candidate donors in rice improvement and breeding. In this study, a set of 200 rice landraces were evaluated to determine their resistance to 10 pathogenic Xoo strains resistance by the leaf-clipping method. The results indicated that the tested rice landraces had different resistance levels against different Xoo strains. Multiple comparisons showed that the Xoo strain PXO99 was virulent to the tested rice landraces. Sixty-six rice landraces conferred resistance against at least one Xoo strain. These resistant rice landraces screened were then performed the presence of 14 cloned BB resistance genes by closely linked molecular markers and designed specific primers. The results showed that none of these resistant accessions contained xa13, Xa21, Xa27, and Xa45(t) homologous fragments, while 9, 24, 4, 7, 9, 15, 1, 5, 4 and 27 accessions contained Xa1, Xa2/Xa31(t), Xa14, Xa3/Xa26, Xa4, xa5, Xa7, Xa10, Xa23 and xa25 homologous fragments, respectively. Sequence analysis further revealed that nucleotide variations around functional nucleotide polymorphisms region were observed within these accessions containing the Xa1, Xa2/Xa31(t), Xa14, Xa3/Xa26, Xa4, xa5, Xa10, Xa23 and xa25 homologous fragments. These results along with phenotypic resistance spectrum supported that these accessions carried nine resistance homologous genes. Only one accession (Qishanggu_Wenshan) carried the Xa7 resistance gene. We also found that some resistant rice landraces, especially Xilandigu_Baoshan, and Laoyaling_Lincang without the above resistance genes, which mediated broad spectrum resistance to multiple Xoo strains, were identified as potential sources for breeding rice lines resistance to BB.