In focus: Blast disease in rice

In focus: Blast disease in rice

Introduction

• Blast disease is a fungal disease that infests rice severely threatening food security worldwide.
• In India, blast disease is epidemics occurred 7 times between 1980 and 1987 in AP, HP, Haryana and TN.

Details

• Blast disease in rice is caused by fungus Magnaporthe oryzae which is one of the top 10 fungal plant pathogens in the world.
• It can infest rice plant in every stage of growth right from seedling including leaves, roots, nodes, panicles etc.

Disease Management

• Use of fungicides
• Fertilizer management
• Planting at a time when pathogens are dormant
• Breeding programme employing disease resistant cultivars

Challenge

• The pathogen Magnaporthe oryzae has adaptability to various environmental conditions and therefore widespread.
• Managing the disease with fungicides is expensive and also has side effects on human health and environment.
• The pathogen is extremely virulent posing a constant challenge to disease resistant varieties.

Solution

• In this regard, identifying new spectrum of genes responsible for development of disease resistance in the rice genome is necessary.
• This work was undertaken by ICAR-NRRI.
• Once the disease resistant genes are mapped, the rice germplasms dominant in the identified disease resistant genes can be used in breeding programmes.

In brief: National Gene Bank

• National Gene Bank was established in 1997 under National Bureau of Plant Genetic Resources (NBPGR).
• National Bureau of Plant Genetic Resources primarily deals with crop improvement and diversification in India by maintaining and augmenting genetic diversity.
• Its activities include germplasm exploration, exchange and conservation and plant quarantine.
• In this direction, National Gene Bank was established as safe repository to conserve the seeds of crop germplasm.

In brief: National Rice Research Institute, Cuttack

Introduction

• NRRI is the successor of Central Institute for Rice Research in India.
• The Central Institute for Rice Research was established to arrest sever food shortage that occurred in the aftermath of the Great Bengal Famine.
• It is under the Crop Science Division of Indian Council of Agricultural Research (ICAR).

Functions

• Primarily providing research support for stabilizing rice productivity in India.
• To collect, evaluate and conserve rice germplasm.
• Integrated pest, disease and nutrient management.
• Maintain a database of features of rice and rice-based cropping systems in India.