马尾松家系苗期生长性状配合力和杂种优势分析

以湖南省城步2代马尾松种子园人工控制授粉的全同胞家系和全同胞家系的母本与父本的自由授粉半同胞家系种子为试验材料,研究马尾松2代种子园家系苗期的配合力和杂种优势。结果表明:马尾松2代种子园家系间地径、苗高的差异均达极显著,其中地径变幅为0.215 7~0.428 8 cm,苗高变幅为13.425 9~35.568 9 cm。全同胞家系的地径、苗高与其母本的地径、苗高均呈现正相关,其中全同胞家系地径与其母本地径的相关系为0.831,为极显著相关,其它均未达显著水平。在4个杂交组合中,2个一般配合力(GCA)较高的亲本杂交后代81×8的地径均值和特殊配合力效应值均最大,分别为0.428 8 cm和0.024;2个一般配合力较高的亲本杂交后代10×37的苗高均值和特殊配合力效应值并不是最大的,而81×8组合的苗高均值和特殊配合力效应值均是最大的,分别为35.375 0 cm和3.193 4。不同组合间的杂种优势差异很大,其中地径的杂种优的变幅为-16.55%~19.41%,苗高杂种优的变幅为-46.44%~11.84%。

The analysis on growth traits combining ability and heterosis of Pinus massoniana family with seedling

Taking the artificial control pollination of full sib and full sib families of female parent and male parent of open pollinated half sib seeds of Pinus massoniana of the Chengbu Second Generation Seed Orchard of Pinus massoniana of Hu-nan Province as the test materials,to research the combining ability and heterosis of P.massoniana family with seedling in the orchard.The results showed that:there is a significant difference in growth characters of DBH and height of P.massoniana in the difference of the second generation seed orchard,of which the DBH ranged from 0.215 7 ~0.428 8 cm,the seedling height ranged from 13.425 9 to 35.568 9 cm.The DBH and height of full sib family and its female par-ent showed positive correlation,and the DBH related situation of full sib family and its female parent is 0.831,and in significant difference and others were not up to significant level.In four hybrid combinations,two higher general combi-ning ability (GCA)crosses 81 ×8 to size mean and special effect value of combining ability were the biggest,it's 0.428 8 cm and 0.024 respectively;two higher general combining ability of hybrid offspring of parents 10 ×37 seedling height mean and special effect value of combining ability and not the biggest.The 81 ×8 combinations of seedling height mean and special effect value of combining force were the largest,it's 35.375 0 cm and 3.193 4 respectively.The hetero-sis among different combinations is significant difference,the DBH of heterosis ranged from -16.55% to 19.41%,and height of heterrsis ranged from -46.44% to 11.84%.