Ref ID: 10597
Ref Type: Confidential Report
Primary Title: Genetic variation in clonal propagation characters in tropical hybrid pines
Primary Authors: Shepherd, M., Mellick, R., Toon, P. G., Dale, G. T., and Dieters, M. J.
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Periodical:
Volume: 125
Issue:
Start Page:
End Page: 15
Primary Date: 8-10-2003
Pub Place: Lismore, NSW
Publisher: CRC-SPF
Series Title: Technical Report
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Keywords: adventitious rooting,broad sense heritability/biomass/character/clonal/clonal forestry/clonal repeatability/clone/component/control/cutting/cuttings/environment/experiment/F1/F2/family/future/generation/genetic/genetic control/genetic variation/high/hybrid/influence/interspecific/management/methodology/nursery/P/pine/Pinus/Pinus caribaea var.hondurensis/Pinus elliotii var.elliotii/Pinus elliottii/Pinus hybrid/pollination/propagation/ramet/rate/report/root/Roots/south-east Queensland/strike rates/Technical Report/trait/variation/vegetative cuttings/vigour
Abstract: The extent of genetic control for adventitious root formation on vegetative cuttings was investigated in hybrid pines. Two unrelated families were studied, a 1st generation interspecific hybrid between Pinus elliottii var. elliottii and P. caribaea var. hondurensis (Outcrossed F1) (n=288) and a 2nd generation family derived from the self pollination of an F1 hybrid (Selfed F2) (n=408). Two uncorrelated traits were studied, strike rate ie. the number of cuttings (ramets) per clone that formed roots (root%) and root biomass (biomass). On average a clone in the outcrossed F1 family, produced significantly more rooted ramets (average„bSD) (58„bƒ£ƒ¡ƒn%) and a higher root biomass (0.41„bƒ~ƒ|ƒ¢ƒ¤ g) than a clone in the selfed F2 family (56„bƒ¤ƒ¦ƒn% and 0.19„bƒ~ƒ|ƒ¡ƒ£ g) at 19 weeks post-setting which was probably due to the greater vigour in the outcrossed family. Genetic control was significant for both traits in both families. Clonal repeatabilities were high for root% (F1 0.61„bƒ~ƒ|ƒ~ƒ¦ and F2 0.68„bƒ~ƒ|ƒ~ƒ¦) and moderate for biomass (F1 0.3„bƒ~ƒ|ƒ¡ƒ£ and F2 0.31„bƒ~ƒ|ƒ¡ƒ£) with a tendency towards higher clonal repeatabilities in the selfed F2 family. Clonal repeatabilities for strike rates based on multiple (three) settings were moderate (F1 0.37„bƒ~ƒ|ƒ~ƒ¤ and F2 0.46„bƒ~ƒ|ƒ~ƒ¤), indicating that although variation in the environment influences strike rates, there is a significant underlying genetic component. As nursery management and strike rate assessment methodology had been deliberately modified in different settings, it should be possible to increase heritiabilities in future experiments
Notes: Entered by Mervyn Shepherd (09/10/2003)
Reprint: In File
Availability: Online
Address: mshepher@scu.edu.au
Program: SPF Genetic Improvement
Project: A7
Deliverable: A7-3
Confidentiality: Confidential to All Partners
Report: Annual Report 2003/4
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