ABSTRACT

Eucalyptus polybractea is a mallee eucalypt with potential use as a perennial biomass crop for dryland agriculture in southern Australia, in addition to its established success as a source of eucalyptus oil. Sixty-six indigenous, open-pollinated families from West Wyalong and surrounds in New South Wales were tested in trials at Newdegate, Western Australia; Drummartin, Victoria; and Condobolin, New South Wales. Growth was fastest at Condobolin, followed by Drummartin then Newdegate. The estimated cross-site genetic correlation was r_g = 0.85 ± 0.16 between Newdegate and Condobolin, r_g = 1.08 ± 0.35 between Newdegate and Drummartin, and r_g = 1.03 ± 0.32 between Condobolin and Drummartin. Estimated gains suggest that genotype × environment interaction was not practically significant. Narrow-sense heritability for biomass production was ĥ² = 0.18 ± 0.07 at Newdegate, ĥ² = 0.05 ± 0.04 at Drummartin and ĥ² = 0.32 ± 0.08 at Condobolin. Heritability of leaf cineole concentration at Newdegate was ĥ² = 0.38 ± 0.09. The genetic correlation between leaf cineole concentration and biomass production was r_g = 0.07 ± 0.19 and the phenotypic correlation was r_p = −0.12 ± 0.03. Compared to selection on either tree biomass or leaf cineole concentration, index selection incorporating both whole tree biomass and leaf cineole concentration is most effective when looking to maximise both cineole yield and biomass production.

摘要

多头桉属桉树是一种桉树桉树，除了已成功地用作桉树油的来源外，它还可以作为澳大利亚南部旱地农业的多年生生物量作物。在西澳大利亚州纽德盖特的试验中，对来自西怀拉隆和新南威尔士州周边地区的66个土著，开放授粉家庭进行了测试；维多利亚Drummartin; 和新南威尔士州的Condobolin。Condobolin的增长最快，其次是Drummartin，然后是Newdegate。 Newdegate和Condobolin之间的估计跨站点遗传相关性为r _g = 0.85±0.16  ，Newdegate和Drummartin之间的r _g = 1.08±0.35，r _g Condobolin和Drummartin之间的差= 1.03±0.32。估计的收益表明，基因型×环境的相互作用实际上并不重要。狭义遗传用于生物质生产是^ h ²  = 0.18±0.07在Newdegate，ħ ²  = 0.05±0.04在Drummartin和^ h ²  = 0.32±0.08在Condobolin。在Newdegate叶桉油素浓度的遗传力为^ h ²  = 0.38±0.09。叶片桉树脑油浓度与生物量生产之间的遗传相关性为r _g  = 0.07±0.19，表型相关性为r _p ＝ -0.12±0.03。与对树木生物量或叶片桉树脑浓度的选择相比，将全树生物量和叶片桉树脑浓度结合在一起的指标选择在寻求最大限度地提高桉树脑产量和生物量产量的同时最为有效。