Evaluation On Characters Of Temperature Insensitivity And Analysis On Genetic Diversity In American Rice

In general, the rice showed relatively worser quality in Chongqing, because of the simple genetic diversity of restoring lines and disadvantageous condition of climate such as high temperature, excessive fog and lower intensity of illumination. American rice took on a series of advantageous characters in quality, ability of tolerance for fertilizer, resistance to lodge, effective spike ratio, adaptability to strong illumilation, insensitive against temperature, cross-compatibility to both Indica rice and Japonica rice. In this research, we introduced into 33 American rice, evaluated the insensitive against temperature in serial seedtime, and determined the relationship of restoring and retaining lines by crossing with Jin 1A (WA type CMS line). We analyzed the genetic diversity among the America rice and China rice, obtained excellent parents adapting to the condition of high temperature climate such as Chongqing, and laid a foundation of breeding the variety of fine quality and high yield.1. Evaluation on temperature insensitivity in the American rice and Chinese riceWe have evaluated the IV (insensitivity value) of characters of agronomy and quality in between 33 American and 13 Chinese rice breeds, and contrasted the quality characters in between the most insensitive 14 American and 5 Chinese rice breeds. The results show that these American rice breeds are insensitive in the rate of chalk, brown rice and head rice, especially in chalk rate. And basing on the results we have selected 14 American rice which are the most insensitive against temperature such as C94-403, Lemont, SB01-1692, SB01-1534, C96-722, Katy, SB01-1530, SB01-5529, C93-134, Maybelle, Kaybonnet, SB01-1536, C94-416, and C93-143-1.2. Identification on ability of restoring and maintaining in the American riceF1 fertility of crosses between 33 varieties collected from America and Jin 1A (WA type CMS line) was tested. The results show the differences in fertility restoring degree are present in rice in...