title: Detection of  bacterial blight resistance genes in basmati rice landraces.
abstract: Aromatic  basmati rice is vulnerable to bacterial blight disease. Genes conferring  resistance to bacterial blight have been identified in coarse rice; however,  their incorporation into basmati varieties compromises the prized basmati  aroma. We identified bacterial blight resistance genes Xa4, xa5, Xa7,  and xa13 in 52 basmati landraces and five basmati cultivars using PCR  markers. The Xa7 gene was found to be the most prevalent among the  cultivars and landraces. The cultivars Basmati-385 and Basmati-2000 also  contained the Xa4 gene; however, xa5 and xa13 were  confined to landraces only. Ten landraces were found to have multiple  resistance genes. Landraces Basmati-106, Basmati-189 and Basmati-208 contained Xa4 and Xa7 genes. Whereas, landraces Basmati-122, Basmati-427,  Basmati-433 were observed to have xa5 and Xa7 genes. Landraces  Basmati-48, Basmati-51A, Basmati-334, and Basmati-370A possessed Xa7 and xa13 genes. The use of landraces containing recessive genes xa5 and xa13 as donor parents in hybridization with cultivars Basmati-385 and  Basmati-2000, which contain the genes Xa4 and Xa7, will expedite  efforts to develop bacterial blight-resistant basmati rice cultivars through marker  assisted selection, based on a pyramiding approach, without compromising aroma  and grain quality.
authors.affiliation: Agricultural Biotechnology Research Institute, Faisalabad, Pakistan. ihsan.ullah_tlw@yahoo.com
authors.forename: I
authors.initials: I
authors.lastname: Ullah
authors.forename: S
authors.initials: S
authors.lastname: Jamil
authors.forename: M Z
authors.initials: MZ
authors.lastname: Iqbal
authors.forename: H L
authors.initials: HL
authors.lastname: Shaheen
authors.forename: S M
authors.initials: SM
authors.lastname: Hasni
authors.forename: S
authors.initials: S
authors.lastname: Jabeen
authors.forename: A
authors.initials: A
authors.lastname: Mehmood
authors.forename: M
authors.initials: M
authors.lastname: Akhter
mesh_terms: D060467:Disease Resistance / Q000235:genetics*; D060146:Ecotype; D017343:Genes, Plant / Q000235:genetics*; D018895:Microsatellite Repeats / Q000235:genetics; D012275:Oryza / Q000235:genetics* / Q000382:microbiology*; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology*