Genetic analysis on early growth and cold tolerance of Eucalyptus urophylla × E. dunnii hybrids

WENG Qijie,LAI Qiuxiang,LI Fagen,ZHOU Changpin,LI Jianwen,LI Mei,GAN Siming

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (05) : 33-38.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2015, Vol. 39 ›› Issue (05) : 33-38. DOI: 10.3969/j.issn.1000-2006.2015.05.006

Genetic analysis on early growth and cold tolerance of Eucalyptus urophylla × E. dunnii hybrids

  • WENG Qijie1,LAI Qiuxiang2,LI Fagen1,ZHOU Changpin1,LI Jianwen2,LI Mei1,GAN Siming1*
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Abstract

With the objective to clarify the genetic parameters of growth and cold tolerance in interspecific hybrids between Eucalyptus urophylla S. T. Blake and E. dunnii Maiden, a factorial mating population of the two species was investigated on 8-month-old cold tolerance(C8)as well as 20-month-old growth traits height(H20)and diameter at breast height(D20). For all the three traits measured, the variance components of E. urophylla female, E. dunnii male and female×male interaction were not significant, in which the interaction was the main source for C8 while both the female and interaction effects contributed to growth(H20 and D20), with the female effect at a higher magnitude. Narrow-sense heritability(h2)values of C8, H20 and D20 were 0, 0.29 and 0.22, respectively, indicating little genetic control of cold tolerance but moderate genetic control of growth. Except the significant phenotypic correlation(P<0.05)between H20 and D20, all the rest phenotypic and additive genetic correlation coefficients were not significant among traits. Female general combining ability(GCAF)and general hybridizing ability(GHAF)were weakly correlated. In addition, female-parent heterosis values were calculated. It was concluded that the h2 values for all the traits were markedly small and selection of superior hybrids and individuals would be appropriate in breeding practices.

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WENG Qijie,LAI Qiuxiang,LI Fagen,ZHOU Changpin,LI Jianwen,LI Mei,GAN Siming. Genetic analysis on early growth and cold tolerance of Eucalyptus urophylla × E. dunnii hybrids[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2015, 39(05): 33-38 https://doi.org/10.3969/j.issn.1000-2006.2015.05.006

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