Analysis on Certified Medium Rice by Hubei Provincial Crop Variety Appraisal Committee in Recent Years

The medium rice varieties(MRV)certified by Hubei Provincial Crop Variety Appraisal Committee from 2005 to 2010 were introduced and their traits such as yield,quality and resistance were analyzed.All of the 46 MRV were hybrid rice including three-line and two-line hybrid rice.The proportion of two-line varieties in MRV was increasing year by year and three-line varieties decreasing correspondingly.The yield and quality of two-line varieties were a little higher than three-line varieties.The yield of certified MRV was 3.56%higher than the check variety on average,and it was increasing year by year.About 76.9%of certified MRV met the 3rd class of national rice quality standards.Almost all varieties were highly susceptible to rice blast,and most varieties were susceptible or highly susceptible to bacterial blight.