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Abstract
Background: Bacterial leaf blight (BLB) of rice occupies the most significant position among various potentially important bacterial diseases all over Pakistan. The first important step towards the management of this disease is the characterization of the pathogen. Methods: Survey was conducted and disease samples were collected from 9 different locations of Punjab. Isolation and characterization by biochemical tests was done from the diseased samples under standard conditions in the laboratory. For pathogenicity and virulence characterization, all isolates were inoculated on IR-24, Basmati super and Basmati-2000 varieties. Data was recorded after three weeks of inoculation. Results: 30 isolates of Xanthomonas oryzae pv. oryzae (Xoo) were purified from the diseased plants of different geographical origin which had very similar morphological and biochemical characteristics. PXo-20 (causing 51.35% leaf damage) and PXo-16 (causing 50.05% leaf damage) were found most virulent for Basmati Super and Basmati-2000. Conclusion: The presence of highly virulent isolates in Sheikhupura is alarming and there is dire need to incorporate new resistance genes in commercial rice cultivars to cope with BLB.

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Hafiz Muhammad Imran Arshad, Saima Naureen, Kamran Saleem, Safdar Ali, Tanzila Jabeen, Muhammad Masood Babar. (2014) Morphological and biochemical characterization of Xanthomonas oryzae pv. oryzae isolates collected from Punjab during 2013, , Volume 2, Issue 3.
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Advancements in Life Sciences
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Volume 2
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