鹅掌楸属杂交测定初步分析研究

Preliminary Study on Hybrid Progeny Test in Liriodendron chinense

鹅掌楸属杂交测定林的生长状况进行分析,结果表明5 a生树高、胸径、材积年平均生长量为1.92 m,2.5 cm,0.009 2 m3;生长最快杂交组合是T11×C8,其平均年生长量分别为2.39 m,3.4 cm和0.018 3 m3。3个生长性状杂交组合间都呈极显著的差异,为优良杂交组合的选择奠定基础。树高、胸径和材积的杂交组合(家系)遗传力分别为0.501,0.631和0.687,分别进行优良杂交组合选择,其现实遗传增益为16.3%,32.9%和116.1%。几种交配模式之间的材积生长比较结果是T×C>C×T>T自由授粉>C自由授粉>C×C>T×S。优良杂交组合T11×C8、T12×C8、C9×T12的杂种优势率分别为108.7%,64.3%和110.7%。

Growth analyses of progeny test of hybridization in Liriodendron were performed .The results indicated that the annual average increments of tree height ,diameter at breath height （DBH） and stem volume of 5‐year‐old test planta‐tion were 1.92 m ,2.5 cm ,0.009 2 m3 ,respectively .The fastest cross combination of growth was T11 × C8 ,which annu‐al average increment of tree height ,DBH and stem volume were 2.39 m ,3 .4 cm and 0.018 3 m3 .There were significant differences in tree height ,DBH and stem volume among cross combinations ,which showed superior ones could be select‐ed .The broad heritability of cross combination （family） for tree height ,DBH ,stem volume were 0.501 ,0.631 and 0.687 ,and the realized genetic gains reached 16.3% ,32.9% and 116.1% based on the selection of superior cross combi‐nations .The comparison result of stem volume was T × C〉C × T〉open pollination of T 〉open pollination of C〉C × C〉T × S .The heterosis rates of T11 × C8 ,T12 × C8 and C9 × T12 were 108 .7% ,64 .3% and 110 .7% .