Interactions of genotype with site for height and stem straightness in Pinus taeda in Zimbabwe

摘要

The magnitude and importance of genotype x environment interactions (GXE) for stem height and straightness at 2, 10, 14 and 23 years of age were estimated for Pinus taeda L, planted at four sites in Zimbabwe. Genetic correlations between heights at different sites varied from low to high (0.18 to 0.95). They were not consistent across the different ages, but were generally high between all sites at younger ages and progressively diminished with age. These results suggest that early growth assessments may not be reliable for predicting GXE at maturity. Genetic correlations between stem straightness scores at different sites also varied from low to high (-0.13 to 0.95); those between sites A and C, and between sites B and D, were consistently high (>0.84) at ages greater than 2 years.