Analysis on genetic variation of growth traits of 5 years old Tectona grandis L.f.clones at southwestern region of Hainan
[Objective]To study the genetic variation and annual correlation of growth traits in Tectona grandis L.f.clones,and select fast growing excellent clones in the early stage.[Method]Using a completely randomized block design with 6 single row plots and 6 replicates,we conducted variance analysis,Duncan multiple comparisons,genetic parameter estimation,and correlation analysis on the preservation rate and growth indicators of 15 T.grandis L.f.clones in the field after afforestation in Ledong county,Hainan province.Through principal component analysis,comprehensive scores were calculated,and on this basis,fast growing excellent clones were selected.[Result]At 5 years after afforestation,there was a significant difference in the preservation rate between clones of T.grandis L.f.(P＜0.05).The preservation rate of clones ranged from 61.50%to 83.33%,with an average preservation rate of 73.26%.Clone 7509 had the highest preservation rate of 83.33%;At 5 years after afforestation,there were extremely significant differences(P＜0.001)in tree height,diameter at breast height,and individual volume among T.grandis L.f.clones,with an average of 5.29 m,7.29 cm,and 16.34 dm3,respectively.Clones 74_12 was the highest,with the average values of tree height,diameter at breast height,and individual volume of 6.12 m,9.11 cm,and 27.45 dm3,respectively;At 1-5 years after afforestation,the coefficient of variation of tree height,diameter at breast height,and individual volume of T.grandis L.f.clones ranged from 15.02%to 19.35%,13.65%to 20.14%,and 31.04%to 41.01%,respectively.The repeatability ranged from 0.697 to 0.858,0.819 to 0.847,and 0.751 to 0.854,respectively;The annual correlation of growth traits of T.grandis L.f.clones showed a significant level(P＜0.05).[Conclusion]There is a stable genetic variation among the growth traits of T.grandis L.f.clones,which has a high potential for genetic improvement;The fast-growing clones 74_12,7114,and 7509 of T.grandis L.f.were selected for the southwestern region of Hainan.The average values of tree height,diameter at breast height,individual volume,and preservation rate of the selected clones are 5.77 m,8.07 cm,21.27 dm3,and 74.61%,respectively,which are 19.21%,23.60%,75.60%,and 3.40%higher than the control.The actual gains in tree height,diameter at breast height,and individual volume after selection are 9.07%,10.69%,and 30.20%,while the genetic gains are 7.71%,9.09%,and 25.67%.The three selected clones can be used as excellent materials for subsequent T.grandis L.f.breeding and promotion.
NETL
NSTL
万方数据
