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Inheritance of freezing resistance in interspecific F1 hybrids of Eucalyptus


Tibbits, WN and Potts, BM and Savva, MH, Inheritance of freezing resistance in interspecific F1 hybrids of Eucalyptus, Theoretical and Applied Genetics: International Journal of Breeding Research, 83, (1) pp. 126-135. ISSN 0040-5752 (1991) [Refereed Article]

Copyright Statement

Copyright 1991 Springer

DOI: doi:10.1007/BF00229235


The inheritance of freezing resistance in interspecific F1 hybrid families of Eucalyptus encompassing 27 different species combinations and a range of levels of hardiness was examined. Freezing resistance was assessed by determining the temperatures required to cause either 30% (T30), 40% (T40), or 50% (T50) leakage of electrolytes from excised leaf discs subjected to artificial freezing. Highly significant variation in freezing resistance occurred between species; the maximum difference between parents in any specific combination was over 9C (E. gunnii x E. globulus). Freezing resistance was inherited in a predominantly additive manner in interspecific hybrids, although there was a tendency towards partial dominance toward the more sensitive species in some combinations (e.g., E. nitens x E. globulus, E. nitens x E. camaldulensis, E. gunnii x E. globulus). The full expression of this genetic variation appeared to increase with hardiness and in some cases appeared to vary with ontogeny. Estimates of individual narrow-sense heritability of freezing resistance for pure E. nitens families were h2 = 0.66_+0.44 and 0.46+_0.44. Across all species combinations examined, the heritability of F1 family means estimated from midparent regression was h2 = 0.760.06 and h2 = 0.890.06 for T40 and T50 values, respectively. The advantage of using selected parents for interspecific hybridization is demonstrated and the implications of these results for breeding for freezing resistance in Eucalyptus are discussed.

Item Details

Item Type:Refereed Article
Keywords:inheritance, freezing/frost resistance, interspecific hybrids, Eucalyptus
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Gene mapping
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the biological sciences
UTAS Author:Tibbits, WN (Dr Wayne Tibbits)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:87381
Year Published:1991
Web of Science® Times Cited:19
Deposited By:Plant Science
Deposited On:2013-11-14
Last Modified:2013-12-05

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