Influence Of PPO Activity On Pre-harvest Sprouting Of Wheat And Its Combining Ability Analysis

To understand the connection of wheat PPO activities and sprouting ratio in China,and to select variesties with steady and low PPO activities,using sepectro- photometer to tested the PPO activites in Wheat.Six wheat varieties (strains) were combined to form twenty-one groups with diallel crossâ…¡. To study and the analysis of the wheat,inclucding the correlation of the polyphenol oxidase(PPO) activity and pre-harvest sprouting,GCA,SCA and heritability of the PPO activity.The rerults showed as follows:1,The span of distributing of Sproting ratio of Wheat cultivars was wide,sproting ratio mainly distributed in 10%-30%.However,the span of distributing of PPO activity was gently,the activity intently distributed in 65-105.2,To study and the analysis of the polyphenol oxidase(PPO) activity and pre-harvest sprouting of wheat,were high significantly correlated and the coefficient was 0.291,achieved markedness level.This suggested that the polyphenol oxidase activity and pre-harvest sprouting of the wheat was controlled by PPO activity.3,To study and the analysis of the diallel-cross material,were high significantly correlated.GCA and SCA significantly different.It indicated that the PPO activity and pre-harvest sprouting of wheat was controlled by both additive and non-additive gene.The analysis and comparison of GCA and SCA effects revealed that the general combination ability(GCA) of different parents and the special combination ability(SCA) of polyphenol oxidase(PPO) activity and pre-harvest sprouting differed greatly.The evaluation of breeding values of parents and the selection of cross combination should base on the variance analysis of GCA and SCA.