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Improvement of resistance to bacterial blight through marker assisted backcross breeding and field validation in rice (Oryza sativa)

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Author(s): Lalitha D. Guvvala | Pranitha Koradi | Vinay Shenoy | Lalitha S. Marella

Journal: Research Journal of Biology
ISSN 2322-0066

Volume: 1;
Issue: 8;
Start page: 52;
Date: 2013;
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Keywords: Bacterial blight | molecular markers | resistance | rice yield | Xanthomonas oryzae pv. oryzae

ABSTRACT
Bacterial blight is one of the major constraints in rice cultivation. Breeding for durable resistance is most effective andeconomical method to combat disease. In present study, four resistance genes (Xa4, xa5, xa13 and Xa21) were pyramidedinto popular cv. Mahsuri and two hybrid rice parental lines, PRR78 and KMR3 using marker assisted back cross breeding.Nine pyramid families of each background were evaluated under both artificial and natural disease conditions. Pyramidswere inoculated with sixteen Xanthomonas oryzae pv. oryzae isolates collected from different parts of India. BF16 washighly virulent on recurrent parents with a yield loss of 23% in Mahsuri, 28% in PRR78 and 24% in KMR3. BF7 (10% lossin Mahsuri and 13% in KMR3) and BF10 (22% in PRR78) were least virulent. Under natural condition at Maruteru, diseaseshowed a yield loss of 22% in Mahsuri, 28% in PRR78 and 26% in KMR3. Under both conditions, none of the pyramidswere susceptible. There were no significant differences within pyramids with respect to any character evaluated. No pyramidwas susceptible. The agronomic characters showed no significant difference between parent and pyramid. Yield and itsrelated characters were statistically significant between parents and pyramids (P< 0.05). The pyramids insulated a heavyyield loss to the tune of ~28% and pyramiding of resistance genes (two dominant and two recessive) did not show anynegative effect on agronomic performance of any pyramid. These pyramids can be used directly and also as valuable sourceof resistance in future breeding programs.
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