Review: Breeding for Resistance to Sheath blight in rice
Journal Title: International Journal of Farming and Allied Sciences - Year 2014, Vol 3, Issue 9
Abstract
Sheath blight (ShB) disease, caused by Rhizoctonia solani, is an economically important rice disease worldwide, especially in intensive production systems. Several studies have been conducted to identify sources for ShB resistance in different species of rice, including local accessions and landraces. It has been difficult to generate SB resistant rice varieties by relying on traditional breeding because resistance to rice SB is a typical quantitative trait. Pathogenesis related (PR) genes of rice are among the most important defense genes in the interaction of rice with pathogens. Rice diseases such as blast, bacterial blight and sheath blight are major obstacles for achieving optimal yields. To complement conventional breeding method, molecular or transgenic method represents an increasingly important approach for genetic improvement of disease resistance and reduction of pesticide usage. During the past two decades, a wide variety of genes and mechanisms involved in rice defense response have been identified and elucidated. However, most of the cloned genes confer high level of race specific resistance in a gene for gene manner, and the resistance is effective against one or a few related races or strains of the pathogens. The resistance is effective for only few years because the pathogen race or strain keeps changing for survival in nature. Therefore, there is an urgent need to broaden the rice gene pool from diverse resources, of which the wild rice is an ideal option.
Authors and Affiliations
Ali Sattari, Baratali Fakheri, M. Noroozi and Kh. Moazami gudarzi
Keywords
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