马尾松自由授粉家系产脂力遗传变异及选择

Genetic Variation and Selection of the Resin-Yielding Capacity of Open-Pollinated Families of Masson Pine

在福建省大田桃源国有林场,分析了马尾松高产脂初级种子园自由授粉子代18 a林龄时产脂力和生长性状的遗传变异规律和遗传相关性。结果表明:产脂力家系遗传力和单株遗传力分别为0.5891和0.6078;树高、胸径和单株立木材积家系遗传力介于0.2999~0.3817间,单株遗传力介于0.2033~0.2865间;产脂力与树高、胸径和单株立木材积呈高度正向遗传相关,遗传相关系数分别为0.761、0.884和0.930。对产脂力进行选择时,树高、胸径和单株立木材积的间接选择响应分别达到0.945、1.209和1.303,在获得产脂力较高遗传增益的同时,可间接获得较大生长性状遗传增益。在遗传变异及遗传相关分析基础上,筛选出高产脂家系8个、单株10株,入选的家系平均产脂力、单株立木材积、胸径和树高遗传增益分别为12.32%、4.19%、2.06%和1.07%。入选的单株平均产脂力、单株立木材积、胸径和树高遗传增益分别为58.05%、18.02%、8.38%和3.14%。

For studying the genetic variation rule of masson pine（Pinus massoniana）,the resin-yielding capacity and growth traits such as tree height,diameter at breast height（DBH） and volume of 24 families at age of 18 years were examined in an open-pollinated Progeny test on Datian Taoyuan national forest farm,in Fujian Province.The analysis observed significant differences on resinyielding capacity and growth among tested families.The family and individual heritability of resin-yielding capacity were 0.5891 and0.6078,and those of growth were between 0.2033 and 0.3817,indicating genetic factor performance moderate control to resin yield but mild control to growth.Furthermore,resin-yielding capacity and growth showed close positive genetic correlation.For instance,the genetic correlation coefficient between resin-yielding capacity and tree height,DBH and volume was 0.761,0.884 and 0.930,respectively.Moreover,the indirect selection response of tree height,DBH and volume to resin-yielding capacity was 0.945,1.209 and1.303,separately.8 families and 10 individuals were identified as superior families and individuals based on genetic analysis,getting average family genetic gain of 12.32%,4.19%,2.06% and 1.07%,average individual genetic gain of 58.05%,18.02%,8.38%and 3.14% on resin-yielding capacity,volume,DBH and tree height.