The Studies On Quality Indices Of Soft Wheat

The quality indices,including AWRC,GMP content,SDS sedimentation volume,Pelshenke fermentation time,Grain hardness,Starch content,Protein content,WEAX content,grain vitreousness,PPO activity,Mixing time of wheat samples from 28 cultivars planted in Anhui Province and 18 soft wheat cultivars from two locations (HeFei and Suzhou city) were measured to determine their variance and conducted analyses of partial correlation,multi-regression and cluster. The results are indicated as follows:1 There were significant differences among wheat samples selected from 28 cultivars'in quality indices. Among them,the variations of Pelshenke fermentation time,vitreousness,grain hardness,mixing time,SDS sedimentation volume were large,while those of starch content,protein content was small,variations of AWRC and amylose content were determined by wheat vrieties and environments,but variance of swelling power,SDS sedimentation volume mainly by varieties,PPO activity by environments.2 All quality indices except protein content,PPO activity,mixogram bandwidth in 7 minutes,amylose content and swelling power were high correlated with AWRC. The results of partial correlation analyses indicated that hardness and WEAX content were the most important factors effected AWRC. SDSsedimentation volume,GMP content,Pelshenke fermentation time,wet gluten content and total starch content had an effect on AWRC through hardness. AWRC can be predicted by the Equation:YAWRc=98.597+25.9O4Xl(WEAX content)-0.0618X2(SDS sedimentation volume)-1.525X3(GMPcontent)+0.116X4(hardness)-0.731X5 (total starch content) -0.940X6 (decling angle ofmixogram) +1.206X7 (Mixogram peaking height)?3 Relative content and absolute content of amylose significantly or high significantly correlated with swelling power,and not significantly with total starch content and. PPO activity. Swelling power can be predicted by the equation:Y= 16.416 -0.769X1 (relative content of amylose) +0.579X2 (absolute content of amylose).4 The results by cluster analysis showed that Ningmai 9,Annong95083-2,95083-6,95083-9,Yangmai 9,Yumai 50,Wanmai 18,Wanmail9,and so on had good cookie quality potential,wheat varieties HuaimailS,Neixiangl88,Ningmai9,Yangmai9,YumailS,WanmailS,YumaiSO,Annong95083-9,Wanmail9 aslo had good noodle quality potential,among them,Annong95083-9,HuaimailS,Wanmai33,Xiaoyan54 were low in PPO activity.