Jiayong Liu

Evaluating sugarcane families by the method of Dynamic Technique for Order Preference by Similarity to Ideal Solution (DTOPSIS)

Enlarging the quantity of seedlings of elite families and discarding inferior sugarcane (Saccharum spp.) families could improve sugarcane breeding and selection efficiency. The feasibility of using the method Dynamic Technique for Order Preference by Similarity to Ideal Solution (DTOPSIS) method was explored to identify superior sugarcane families. Data on 5 traits: Brix, millable stalks per stool (MS), stalk diameter (SD), plant height (PH), and percent pith were collected from two family trials having 17 families and two check cultivars at two sites including plant-cane and first-ratoon crops. The rest of the seedlings were planted into field for routine selection in the regular program. The DTOPSIS method calculates a comprehensive index (C i ) which expresses the closeness of a solution to the ideal solution and was used in this study to test the distance of each family to the ideal family. The C i of the families was compared to the family selection rate in the regular program by determining the selection rate at Stage 1 to Stage 4 for each family in the regular program. The result indicated that the C i values calculated from family trials were significantly (p<0.01) correlated to the selection rate at Stage 2 (r=0.8059), Stage3 (r=0.7967), and Stage 4 (r=0.8202), and indicating that promising clones were selected from families with higher C i values in the family trial. Thus, it could be feasible to use DTOPSIS to determine elite sugarcane families and to eliminate inferior families and thereby, increasing the variety selection efficiency.

Ratooning traits in sugarcane progenies of ROC varieties as female parents: Ratooning traits in sugarcane progenies of ROC varieties as female parents

Thirty-one cross combinations consisted of thirteen ROC varieties including ROC1,ROC6,ROC8,ROC9,ROC10,ROC11,ROC20,ROC22,ROC23,ROC24,ROC25,ROC26 and ROC28 as female parents were made,and methods of family evaluation and ratooning ability(RA)were combined together for evaluating the ratooning traits of progeny populations under natural drought conditions.The results showed that the progenies were more significantly affected by ratoon crop than plant crop.Moreover,heritability of ratoon crop in cane yield,sugar yield and stalks were higher than that in plant crop,availing to breeding the strong ratoon offspring.Among the thirteen ROC female parents,the general combining ability(GCA)of main traits from ROC25,ROC11 and ROC24 were all higher in plant crop and ratoon crop.Furthermore,values of gca in cane yield,sugar yield and brix of ratoon crop were higher than that of plant crop.Thus these ROC parents could be excellent female parents with drought resistance and strong ratooning traits.The special combining ability(SCA)of main traits in plant crop and ratoon crop of ROC25×Dezhe 93-88 were higher than that of other cross and the ratooning ability of sugar yield and cane yield were 13.7% and 20.4% higher than those in ROC22 respectively.These ROC25×Dezhe 93-88 could be excellent cross for breeding the new varieties which could combat drought and have strong ratoon sugarcane.

Principal component analysis and cluster analysis of agronomic and quality traits of exotic sugarcane germplasm: Principal component analysis and cluster analysis of agronomic and quality traits of exotic sugarcane germplasm

One hundred and thirteen accessions of exotic sugarcane germplasms consisted of Q,VMC,FR,RB,CP and TCP were investigated in this study.Thirteen agronomic and quality traits including germination,tillering,ratoon germination,stalk height,stem diameter,number of millable stalk,stalk weight,cane yield,brix,sugar content,simple purity,fiber content and sugar yield were observed by principal component analysis and cluster analysis.The result of correlation analysis showed that sugar and cane yield was significantly positively related to height,millable stalks and single stem weight.Sucrose content was significantly positively related with brix and purity.Significant negative correlation was found between millable stalks and diameter.Ratoon sprout was closely linked to rate of germination,tillering percentage,and there was multiple co-linear relation among these traits.The result of principal component analysis on 13 traits showed 5 principal elements,which provided 75.16% cumulative variance.Based on the principal component scores,113 accessions of sugarcane germplasms were grouped into 7 clusters.ClusterⅠwas high in fiber content,low in yield.Cluster Ⅱ was weak in germination and tillering,low in yield.Cluster Ⅲ was strong in ratoon germination,high in cane yield and sugar content.Cluster Ⅳ could be used as parents for energy cane breeding.Cluster Ⅴwas high in cane yield,low in sugar content.Cluster Ⅵ was high in sugar content,low in cane yield.Cluster Ⅶ was high in cane yield,high in sugar content.

Post-harvest quality deterioration of two promising sugarcane clones CYZ02-588 and CYZ02-1826 developed at Yunnan, P.R. China

The present work is an attempt to evaluate promising sugarcane varieties for their post harvest deterioration under storage. Two sugarcane clones CYZ02-588 and CYZ02-1826 were stored under natural condition for 6 days without any water spray sucrose content (SC), gravity pure (GP), reducing sugar (RS) and single stalk weight (SSW) were estimated every day. The results indicated that SC, GP and SSW decreased at various levels and RS increased gradually. The deterioration in quality was found lower in CYZ02-588 compared to CYZ02-1826. These results help in understanding the process of post harvest deterioration of sugarcane.