Subspecies Characteristics and Their Relationships with Economic Characters of Weedy Rice in Liaoning Province

Research was done to analyze the subspecies characteristics and their relationships with economic characters of weedy rice in Liaoning province of China.With the research,we analyzed the subspecies characteristics and the economic characters of weedy rice in Liaoning province of China and the relationships between them.We found continuous variation was found in Cheng's Index in our research: most weedy rices were Japonica or near Japonica,a few of them were Indica or near Indica,Cheng's Index total trend was Japonica.There was not significant correlations in 6 subspecies characteristics which refer to Cheng's index.Despite relative independent,6 subspecies characteristics influence on subspecies characteristic of weedy rice.Relationships among length of 1st and 2nd rachis and panicle length,plant height,awn length had reached significant correlations in 0.01 level,so did length/width ratio of spikelets and panicle length,plant height,awn length.Leaf pubescence got a negative correlation in 0.01 level with primary branch number.There were no significant correlations in Cheng's Index and panicle length、panicle length、awn length.In a word weedy rice,which is rich in biological diversity,is a useful genetic resource in rice breeding.