Abstract: 57 new rice varieties(lines)carrying Wx-mq gene were used as experimental materials. Marker-assis-ted selection,chemical extraction,as well as statistical methods were used to detect Wx-mq gene,to determine rice RVA profile characteristics and amylose content of all varieties ( lines),to study the relationship among RVA profile characteristics between RVA profile characteristics and amylose contents ( AC ). To study the differences of RVA profile characteristics of rice varieties with different AC,we divided these varieties into three groups,including low AC,moderate AC and high AC. The results showed as follows:It was shown that Wx-mq gene were detected in 57 new rice varieties ( lines ). The tight relationship among RVA profiles was found. There were very significant (P<0.01) positive correlations among PKV,HPV,CPV,PeT and CSV,very significant positive correlations be-tween BDV and PKV,among PeT,SBV and CSV,respectively,significant(P<0.05)positive correlations between PaT and HPV,PaT and PeT,respectively,and very significant negative correlation between SBV and PKV,SBV and BDV. Determination of amylose content indicated that the amylose content of 57 materials were mainly distributed between 8%-11%.Varieties with different AC had different RVA profile characteristics,when AC was higher,PKV,HPV, CPV,CSV,PeT and PaT were higher,and the trend of BDV and SBV were not obvious. AC was very significant posi-tively correlated to HPV,CPV,CSV and PeT,and significant positively correlated to PKV. The results of this study can be further expanded the theoretical basis of using RVA profile value to evaluate rice cooking and eating qualities.

Key words: Rice, Translucent endosperm gene, Low amylose content, RVA profile properties, Correlation analyses

CLC Number: 

• S511.22