Elucidation of meiotic nuclear restitution mechanisms in potato through analysis of microtubular cytoskeleton |
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Authors: | Clara Conicella Antonella Capo Maria Cammareri Angela Errico Natalia Shamina Luigi M Monti |
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Institution: | (1) Biotechnology Center, Punjab Agricultural University, Ludhiana-, 141 004, India;(2) International Rice Research Institute, Manila, Philippines |
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Abstract: | DNAs of 693 isolates of bacterial blight pathogen of rice, Xanthomonas oryzae pv. oryzae (Xoo), were characterized using PCR-based primers pJEL1 and pJEL2. The pathogen populations were grouped into 97 haplotypes based on DNA-banding patterns. An un-weighted pair-group method
using arithmetic averages (UPGMA) indicated a high level of diversity in the pathogen isolates (51 lineages of Xoo at a 70% similarity level). Among these, lineages 5, 7, 27, and 29 are widely distributed and others are localized in the
northern region of India. The isolates represent lineage-27, were prevalent in the entire disease-prone area in the region
except at Ferozepur. Pathotyping data of the representative isolates of each lineage also indicate 17 different reaction patterns
on a set of isogenic lines. Resistance genes
xa8 and Xa21 were the most effective followed by xa5, and Xa7 against Xoo isolates prevalent in northern India. Different genes in combinations (xa5+xa13, xa5+Xa21, xa13+Xa21, and xa5+xa13+Xa21) in IR24 genetic background provided better protection against all the pathogen isolates tested in this study than did the
component genes.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | bacterial blight pathogen DNA fingerprinting genetic diversity resistance gene(s) rice Xanthomonas oryzae pv oryzae |
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