Patterns of genotype-by-environment interaction in diameter at breast height at age 3 for eucalypt hybrid clones grown for reafforestation of lands affected by salinity |
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Authors: | Craig M Hardner Mark Dieters Glenn Dale Ian DeLacy Kaye E Basford |
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Institution: | (1) The University of Queensland, School of Land, Crop and Food Sciences, St Lucia, Queensland, 4072, Australia;(2) Tree Crop Technologies Pty Ltd., Level 8, 97 Creek St, Brisbane, Queensland, 4000, Australia |
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Abstract: | The commercial viability of plantations established for the recovery of saline lands may be supported by the deployment of
improved genetic material matched to these particularly challenging environments. Patterns of genotype-by-environment interaction
were investigated in a highly unbalanced data set of diameter at breast height at approximately 3 years for a total of 841
genotypes from ten Eucalyptus camaldulensis × Eucalyptus globulus and Eucalyptus camaldulensis × Eucalyptus grandis hybrid families assessed across 21 trials grown on a range of saline and non-saline low rainfall sites from southeast Queensland
through central NSW, Victoria, Tasmania and southeast South Australia to southwest Western Australia using factor-analytic
mixed-model methods. There was significant heterogeneity among trials in estimates of family variance, genotype-within-family
variance, the ratio of family variance to total genetic variance and individual broad-sense heritability. Cluster analyses
indicated that family effects were highly correlated across a main group of 19 trials and that most trials fell into two major
groups for genotype-within-family effects, with an average correlation among trials within these groups of 0.55. There was,
however, no obvious geographical or other explanation for the patterns, suggesting that genotypes should be deployed on the
basis of broad-scale adaptation. |
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