Provenance variation and selection in growth,shape,and quality traits of 10-year-old Toona sinensis
[Objective]The purpose of this study is to examine the provenance variations in growth,shape and quality traits of 10-year-old Toona sinensis,to reveal the variation of different traits in geographical provenance,and to carry out provenance division and selection.[Method]Using the 10-year-old T.sinensis provenance test in Kaihua County,Zhejiang Province as material,the tree height,diameter at breast height(DBH),height under the branch,crown width,volume,trunk completeness,and crown completeness were measured,and various ecological and environmental factors were obtained.Variance,principal component,correlation,and cluster analysis were applied to calculate the general heritability,comprehensive selection index,and genetic gain to elucidate the geographical variation patterns of growth,shape,and quality traits and their relationship with ecological factors of different origin.[Result]There were significant provenance differences(P＜0.01)in tree height,DBH,trunk completeness,and volume.The DBH,tree height,crown width,height under branches,and volume of the provenances displayed typical zonal variation patterns.There was a highly significant positive correlation(P＜0.01)between DBH and crown width,height under branches and volume.DBH was positively correlated(P＜0.05)with the annual mean temperature,the average daily minimum temperature in the coldest month,and the average daily mean temperature in the driest season.According to the clustering results of all provenances,T.sinensis could be divided into two provenance zones:south and north.Three excellent provenances were selected,namely Yuanmou,Enshi and Taihe.[Conclusion]There are significant differences among the provenances of 10-year-old T.sinensis,with a gradual decrease in the variation of tree height,DBH,and volume from south to north.DBH is the main genetic improvement trait during selection,which can provide a reliable basis for the selection of high-quality T.sinensis varieties for timber use.[Ch,3 fig.6 tab.25 ref.]
Toona sinensisgenetic variationlatitude variationtemperatureprovenance zone
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