Genetic control of propagation traits in a single Corymbia torelliana × Corymbia variegata family

Shepherd, M., Pomroy, P., Dieters, M. J. and Lee, D. (2007) Genetic control of propagation traits in a single Corymbia torelliana × Corymbia variegata family. Canadian Journal of Forest Research, 37 12: 2563-2574. doi:10.1139/X07-111


Author Shepherd, M.
Pomroy, P.
Dieters, M. J.
Lee, D.
Title Genetic control of propagation traits in a single Corymbia torelliana × Corymbia variegata family
Journal name Canadian Journal of Forest Research   Check publisher's open access policy
ISSN 0045-5067
Publication date 2007-12-01
Sub-type Article (original research)
DOI 10.1139/X07-111
Open Access Status Not yet assessed
Volume 37
Issue 12
Start page 2563
End page 2574
Total pages 12
Place of publication Ottawa
Publisher National Research Council Canada
Language eng
Subject 070507 Tree Improvement (Selection and Breeding)
Abstract Genetic control of vegetative propagation traits was described for a second-generation, outbred, intersectional hybrid family (N = 208) derived from two species, Corymbia torelliana (F. Muell.) K.D. Hill & L.A.S. Johnson and Corymbia variegata (F. Muell.) K.D. Hill & L.A.S. Johnson, which contrast for propagation characteristics and in their capacity to develop lignotubers. Large phenotypic variances were evident for rooting and most other propagation traits, with significant proportions attributable to differences between clones (broad-sense heritabilities 0.2-0.5). Bare root assessment of rooting rate and root quality parameters tended to have the highest heritabilities, whereas rooting percentage based on root emergence from pots and shoot production were intermediate. Root biomass and root initiation had the lowest heritabilities. Strong favourable genetic correlations were found between rooting percentage and root quality traits such as root biomass, volume, and length. Lignotuber development on a seedling was associated with low rooting and a tendency to poor root quality in cuttings and was in accord with the persistence of species parent types due to gametic phase disequilibrium. On average, nodal cuttings rooted more frequently and with higher quality root systems, but significant cutting type x genotype interaction indicated that for some clones, higher rooting rates were obtained from tips. Low germination, survival of seedlings, and rooting rates suggested strong hybrid breakdown in this family
Q-Index Code C1

 
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