Bacterial Blight, a serious threat to productivity of rice (Oryza Sativa L.), an overview
By: Hamid Ali, Fida Muhammad Abbasi, Habib Ahmad
Key Words: Rice kresick, Xanthomonas oryzae pv. Oryzae (Xoo), Breeding for resistance, Marker Assisted Selection (MAS), Gene pyramiding.
Int. J. Biosci. 9(6), 154-169, December 2016.
Xanthomonas oryzae pv. oryzae causes bacterial blight (BB) of rice (Oryza sativa L.), which constrain production of this staple crop in much of Asia and parts of Africa. Tremendous progress has been made in characterizing the disease and breeding for resistance. Bacterial blight is a vascular disease resulting in a systemic infection of rice and it produces tannish-grey to white lesions along the veins. In rice there are 38 major genes for resistance to bacterial blight and more than 30 races of X. oryzae pv. oryzae have been reported. Genetic resistance of rice to BB isolates is diverse as the pathogen exhibit significant diversity among the isolates. There is also a remarkable structural and functional diversity among genes for resistance to these isolates. This article review the recent advances and progress made towards the ultimate goal of developing disease-resistant varieties of rice. The objective of this review is to consolidate the existing knowledge about bacterial blight in rice and the progress made both in conventional as well as in molecular dimensions of breeding together with potential findings and constraints.