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Inheritance of freezing resistance in interspecific F1 hybrids of Eucalyptus

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Tibbits, WN and Potts, BM and Savva, M (1991) Inheritance of freezing resistance in interspecific F1 hybrids of Eucalyptus. Theoretical and Applied Genetics, 83 (1). pp. 126-135. ISSN 0040-5752

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Abstract

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 9°C (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 h 2 = 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 h 2 = 0.76±0.06 and h 2 = 0.89±0.06 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 Type: Article
Keywords: inheritance - freezing/frost resistance - interspecific hybrids - eucalyptus
Journal or Publication Title: Theoretical and Applied Genetics
Page Range: pp. 126-135
ISSN: 0040-5752
Identification Number - DOI: 10.1007/BF00229235
Additional Information: BM Potts. The original publication is available at www.springerlink.com
Date Deposited: 23 Sep 2008 00:45
Last Modified: 18 Nov 2014 03:49
URI: http://eprints.utas.edu.au/id/eprint/7417
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