<strong>GENETIC CONTROL AND EARLY SELECTION OF THREE </strong><em><strong>Corymbia </strong></em><strong>SPECIES</strong>
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The main objective of this study was to investigate genetic control for individual volume (VOL) and genetic and phenotypic correlation between trait measured at two different ages. We also assessed three different selection intensities (i=1%, i=5% and i= 10%) to understand the effects on genetic gain and effective size. Eight progeny tests were evaluated included three tests of <em>C. citriodora</em> (CCT), two tests of <em>C. variegata</em> (CCV), and three tests of <em>C. torelliana</em> (CTO). Narrow-sense heritability ranged from 0.26 to 0.62 for the CCT tests, from 0.07 to 0.21 for the CCV tests, and from 0.14 to 0.69 for CTO. The coefficients of individual genetic variation ranged from 22.5% to 63.9% for CCT, from 19,3% to 28,3% for CCV, and from 22.8% to 41.3% for CTO. Considering a selection intensity of 10%, the <em>Ne</em> after selection would range from 31 to 98 for CCT, 36 to 47 for CCV, and 45 to 62 for CTO. For the TP8 CTO test, a selection intensity greater than 10% is recommended. With a selection intensity of 10%, genetic gains ranged from 25 to 107% for CCT, from 14 to 27% for CCV, and from 19 to 64% for CTO.
本研究的核心目标为探究单株材积（VOL）的遗传调控机制，以及不同龄期测定性状间的遗传相关与表型相关。本研究还设置了3种不同的选择强度（i=1%、i=5%及i=10%），以解析其对遗传增益与有效群体规模的影响。本研究共评估了8个子代测定林，其中包含3份柠檬桉（C. citriodora, CCT）测定林、2份斑叶桉（C. variegata, CCV）测定林以及3份托里桉（C. torelliana, CTO）测定林。柠檬桉测定林的狭义遗传力范围为0.26~0.62，斑叶桉测定林为0.07~0.21，托里桉测定林为0.14~0.69。单株遗传变异系数方面，柠檬桉测定林为22.5%~63.9%，斑叶桉测定林为19.3%~28.3%，托里桉测定林为22.8%~41.3%。当选择强度为10%时，柠檬桉测定林选育后的有效群体规模（Ne）范围为31~98，斑叶桉测定林为36~47，托里桉测定林为45~62。针对TP8号托里桉测定林，建议选择强度高于10%。当选择强度为10%时，柠檬桉测定林的遗传增益范围为25%~107%，斑叶桉测定林为14%~27%，托里桉测定林为19%~64%。
