Abstract: Genetic characterization of functional leaves and its relationship with yield were studied with 9 new BT-type japonica sterile lines and 5 restorer lines by NCⅡ design． The results showed that the genetic variances of 12 functional leaves were affected both additive and dominant effects，but the additive effect was primary． The penultimate leaf angle and third leaf angle from top were affected much by environment． The broad-sense heritability and narrow-sense heritability were higher and it was effect that the functional leaves could be selected in early generation． The heredity of the leaf length， leaf width and leaf angle display distinctively and there were no significant correlations among them． While four yield components such as panicle length，panicle number per plant，grain number of spikelet per panicle and grain yield per plant significantly or high significantly positively correlated with the leaf length， leaf area， flag leaf angle． There were significant or high significant positive correlations between leaf and panicle number per plant． The negative significant difference existed among 1 000-grains weight vs leaf length and lead angle，while positive correlation between 1 000-grain weight and leaf width． There was no significant correlation between seed setting rate and 12 functional leaves． The result has a theoretical significance for breeding japonica hybrid rice with high yield．

Key words: Japonica hybrid rices, Functional leave, Genetic analysis, Yield traits, Correlation

CLC Number: 

• S511． 03