Xa26, a gene conferring resistance to Xanthomonas oryzae pv. oryzae in rice, encodes an LRR receptor kinase‐like protein

• Published in: The Plant journal : for cell and molecular biology 2004-02, Vol.37 (4), p.517-527
• Main Authors: Sun, Xinli, Cao, Yinglong, Yang, Zhifen, Xu, Caiguo, Li, Xianghua, Wang, Shiping, Zhang, Qifa
• Format: Article
• Language: English
• Subjects: Agronomy. Soil science and plant productions; Amino Acid Sequence; bacterial blight disease; Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Gene Expression Regulation, Plant; Genetics and breeding of economic plants; Immunity, Innate - genetics; Molecular Sequence Data; Multigene Family; Oryza - genetics; Oryza - microbiology; Oryza sativa; Pest resistance; Plant Diseases - microbiology; Plant pathogens; Plant Proteins - genetics; Plant Proteins - metabolism; Plants, Genetically Modified; Protein Kinases - genetics; Protein Kinases - metabolism; R gene; receptor kinase protein; Receptor Protein-Tyrosine Kinases - genetics; Receptor Protein-Tyrosine Kinases - metabolism; rice; Sequence Analysis, DNA; Varietal selection. Specialized plant breeding, plant breeding aims; Xa26 gene; Xanthomonas - growth & development; Xanthomonas oryzae; Xoo
• ISSN: 0960-7412; 1365-313X
• DOI: 10.1046/j.1365-313x.2003.01976.x

Rice bacterial blight, caused by Xanthomonas oryzae pv. oryzae (Xoo), is one of the most serious rice diseases worldwide. A rice gene, Xa26, conferring resistance against Xoo at both seedling and adult stages was isolated by map‐based cloning strategies from the rice cultivar Minghui 63. Xa26 belongs to a multigene family consisting of four members. It encodes a leucine‐rich repeat (LRR) receptor kinase‐like protein and is constitutively expressed. Sequence analysis revealed that IRBB3 and Zhachanglong lines that are resistant to a broad range of Xoo strains, also carry Xa26. However, significant difference in lesion length was observed among these lines after inoculation with a set of Xoo strains. Moreover, transgenic plants carrying Xa26 showed enhanced resistance compared with the donor line of the gene in both seedling and adult stages. These results suggest that the resistance conferred by Xa26 is influenced by the genetic background.