Genetic variation in 2-year Eucalypt hybrids’ growth and typhoon resistance

Abstract

Abstract: Using a 2×10 factorial mating’s eucalypt hybrids as material: Female parents are Eucalyptus urophylla and Eucalyptus tereticornis,male parents are Eucalyptus grandis, Eucalyptus pellita, E. urophylla and E. tereticornis. The 27-month tree stem volume growth and resistance index to typhoon with speed of 18 and 40 m/s (WR₁ and WR₂) were studied on the hybrids respectively. The results showed: For growth traits, there were no significant difference between female parents (P＞0.05). Significant differences were exist between male parents, between the interaction of female and male parents (P＜0.05). There were significant differences (P＜0.05) between female parents, betweens male parents for WR₁(P＜0.05). WR₂ was only significantly different (P＜0.05) between male parents. For tree volume growth, E. grandis had high general combining ability (GCA) as male parents, combination: T1×G2 and U1×P3 had high special combining ability (SCA); For typhoon resistance, G1, G2 and P2 had high GCA on WR₁ and WR₂ as male parents respectively. Tree volume growth traits were controled by additive gene action and dominance gene action together, their narrow sence and board sence heritabilities were 0.14-0.17 and 0.30-0.36; typhoon resistance index only controled by additive gene action, their heritabilities were 0.10-0.11. The growth traits’ heritability of progenies of E. urophylla as female parent were lower than that of E. tereticornis. But their heritabilities of typhoon resistance were higher than that of E. tereticornis. Volume growth traits generally had significant positive genetic correlation (P＜0.05) with WR₁. But had significant (P＜0.05) negative genetic correlation with WR₂.

CLC Number:

LUO Jian-zhong, XIE Yao-jian, CAO Jia-guang, LU Wan-hong, REN Shi-qi. Genetic variation in 2-year Eucalypt hybrids’ growth and typhoon resistance[J]. Acta Prataculturae Sinica, 2009, 18(6): 91-97.

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