Genetic parameters in subtropical pine F1 hybrids: heritabilities, between-trait correlations and genotype-by-environment interactions

Growth and stem straightness traits of 29 Pinus caribaea var. hondurensis × Pinus tecunumanii (PCH × PTEC) and 26 P. caribaea var. hondurensis × Pinus oocarpa (PCH × POOC) hybrid pair-crosses plus a total of 16 intraspecific families were assessed at ages 5, 8 and 15 years from planting at two sites. The PCH × PTEC hybrid was the most productive, yielding 37 % more than a Pinus elliottii local control and was 21 % superior to either parental species in DBH growth. PCH × POOC hybrid was, on average, 16 % superior to either parental species for DBH. Narrow-sense heritability estimates were low to moderate for growth traits (average of 0.27) and stem straightness (0.16). The estimated additive genetic correlations between growth traits and ages within traits were high (>0.8) and positive, providing confidence in early selection based on diameter at breast height. The high proportion of estimated additive genetic variance compared to dominance variance in the F1 pine hybrids suggests tha...

29个洪都拉斯加勒比松（Pinus caribaea var. hondurensis）×特克努曼松（Pinus tecunumanii）（PCH×PTEC）成对杂交组合（pair-crosses）、26个洪都拉斯加勒比松×卵果松（Pinus oocarpa）（PCH×POOC）成对杂交组合，以及共16个种内家系（intraspecific families）的生长和树干直度性状，在两个试验点种植后的5年、8年和15年进行了评估。PCH×PTEC杂交种生产力最高，其产量比当地湿地松（Pinus elliottii）对照高出37%，且在胸径（DBH，Diameter at Breast Height）生长方面比任一亲本物种优越21%。PCH×POOC杂交种在胸径方面平均比任一亲本物种优越16%。狭义遗传力（narrow-sense heritability）估计值为低到中等水平，其中生长性状平均值为0.27，树干直度为0.16。生长性状之间以及性状内不同年龄之间的估计加性遗传相关系数（additive genetic correlations）较高（>0.8）且为正，这为基于胸径的早期选择提供了依据。F1代松树杂交种中估计加性遗传方差相对于显性方差的高比例表明...