Marker assisted selection of bacterial blight resistance genes in rice.
Bacterial leaf blight caused by Xanthomonas oryzae pv. oryzae is one of the most important diseases affecting rice production in Asia. We were interested in surveying rice genotypes that are popularly used in the Indian breeding program for conferring resistance to bacterial blight, using 11 STMS and 6 STS markers. The basis of selection of these DNA markers was their close linkage to xa5, xa13, and Xa21 genes and their positions on the rice genetic map relative to bacterial blight resistance genes. Eight lines were found to contain the xa5 gene while two lines contained Xa21 gene and none of the lines contained the xa13 gene with the exception of its near-isogenic line. Using the polymorphic markers obtained in the initial survey, marker-assisted selection was performed in the F3 population of a cross between IR-64 and IET-14444 to detect lines containing multiple resistance genes. Of the 59 progeny lines analyzed, eight lines contained both the resistance genes, xa5 and Xa4.
Davierwala
A P
AP
Plant Molecular Biology Unit, Division of Biochemical Sciences, National Chemical Laboratory, Pune 411008, India.
Reddy
A P
AP
Lagu
M D
MD
Ranjekar
P K
PK
Gupta
V S
VS
D001947:Breeding; D005799:Genes, Dominant; D005819:Genetic Markers; D007194:India; D018895:Microsatellite Repeats; D012275:Oryza / Q000235:genetics* / Q000382:microbiology; D010935:Plant Diseases / Q000235:genetics*; D010940:Plant Proteins; D017346:Protein Serine-Threonine Kinases; D012641:Selection, Genetic; D016324:Sequence Tagged Sites; D014974:Xanthomonas
D005819:Genetic Markers; D010940:Plant Proteins; C097148:Xa21 protein, Oryza sativa; D017346:Protein Serine-Threonine Kinases