TAILIEUCHUNG - Current status of rice breeding for sheath blight resistance

Rice is one of the three major food crops in the world. It is the staple food for most of the people of South-East Asia. Rice productivity fluctuates significantly from region to region; season to season due to biotic and abiotic stress. Sheath blight is one of the major biotic constraints in rice cultivation. It is caused by Rhizoctonia solani Kuhn. This disease can cause yield reduction between 20-50% depending on the severity of infection. Several genotypes reported for sheath blight resistance but none of the genotypes were found with absolute resistance. Sheath blight resistance is controlled by polygenes or quantitative trait loci (QTLs) each with small effect. Pyramiding of such QTLs is expected to increase resistance to sheath blight in the cultivars. Genetic engineering of crops with plant pathogenesis-related (PR) genes may give a promising and long-lasting solution for sheath blight disease management. | 2019 8 2 163-175 EXCELLENT PUBLISHERS International Journal of Current Microbiology and Applied Sciences ISSN 2319-7706 Volume 8 Number 02 2019 Journal homepage http Review Article https Current Status of Rice Breeding for Sheath Blight Resistance Susmita Dey1 Jyothi Badri2 Khushi Ram1 . Chhabra1 and . Janghel1 1 Department of Genetics Plant Breeding Chaudhary Charan Singh Haryana Agricultural University Hisar Haryana 125004 India 2Indian Institute of Rice Research Rajendranagar 500030 Hyderabad India Corresponding author ABSTRACT Keywords Rice Sheath blight Rhizoctonia solani Resistance QTLs Article Info Accepted 04 January 2018 Available Online 10 February 2019 Rice is one of the three major food crops in the world. It is the staple food for most of the people of South-East Asia. Rice productivity fluctuates significantly from region to region season to season due to biotic and abiotic stress. Sheath blight is one of the major biotic constraints in rice cultivation. It is caused by Rhizoctonia solani Kuhn. This disease can cause yield reduction between 20-50 depending on the severity of infection. Several genotypes reported for sheath blight resistance but none of the genotypes were found with absolute resistance. Sheath blight resistance is controlled by polygenes or quantitative trait loci QTLs each with small effect. Pyramiding of such QTLs is expected to increase resistance to sheath blight in the cultivars. Genetic engineering of crops with plant pathogenesis-related PR genes may give a promising and long-lasting solution for sheath blight disease management. Introduction Rice is one of the three major food crops in the world. It belongs to the genus Oryza and the tribe Oryzae of the family Gramineae Poaceae . It is cultivating almost one fifth of the total land area covered under cereals. The United Nation declared 2004 as International Year of Rice. The year s theme Rice

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