Rice is the most important food crop for human consumption is the staple food for nearly half of the world population. It continues to play vital role in the international food grain supply. Rice is life for thousands of millions of people. In Asia, more than 2000 million people obtain 60-70 percent of their calories from rice and its products. It is of significant importance for food security in an increasing number of low-income food deficit countries. However rice production is facing serious constraints including a declining rate of growth in yields, depletion of natural resources, labour...