Indian Society of Genetics & Plant Breeding

Assessment of virulence of bacterial blight (Xanthomonas oryzae pv oryzae (Ishiyama) Swings et aJ.) of rice (Oryza sativa L.) and identification of genotypes with high resistance

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Bacterial blight (BB) of rice is the second most devastating
disease that causes substantial yield loss. Study of
pathogenic variability and identification of resistance genes
are key factors in breeding against this disease. Five
isolates collected from different parts of northwestern
India were screened against eight aromatic genotypes to
identify variability in virulence. Most virulent isolate was
used to screen forty eight rice genotypes collected from
different regions of Bihar, Jharkhand and UP to identify
resistant sources. All the aromatic genotypes were found
to be either moderately or highly susceptible against all
the isolates with significant differences in disease progress.
Isolate 5 was found to be most virulent against the
aromatic lines while isolate 4 was least virulent. Isolate
5 was used to screen forty-eight genotypes. Thirteen lines
showed high resistance against the highly virulent isolate.
Inheritance of resistance in these rice lines should,
therefore, be investigated further.

Keywords: Basmati rice, bacterial blight, virulence, landrace


Year: 2005
Volume: 65
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906



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