MOLECULAR ANALYSIS OF RICE (Oryza sativa L.) GENOTYPES FOR BACTERIAL LEAF BLIGHT RESISTANCE
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Date
2010
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Anand Agricultural University, Anand
Abstract
Bacterial leaf blight caused by the bacterial pathogen Xanthomonas
oryzae pv oryzae (Xoo) limits rice yield in all major rice growing regions of the
world, especially in irrigated lowland and rainfed conditions where predisposition
factors favor disease development to epidemic proportions. Since bacterial pathogens
are difficult to manage, development of host plant resistance is the most effective
means of disease management. As many as 31 major genes conferring resistance to
various races of the pathogen have been identified and utilized in rice breeding
programs. However, large-scale and long-term cultivation of varieties carrying a
single gene for resistance resulted in a significant shift in pathogen race frequency
with consequent breakdown of resistance in these cultivars. To combat the problem of
resistance breakdown, pyramiding of resistance genes into different cultivars is being
carried out. Availability of tightly linked marker for individual genes is the prerequisite
for pyramiding of resistance genes
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Keywords
Agricultural Biotechnology, Analysis