Phenotypic analysis of first-year traits in a pseudo-backcross {(slash x loblolly) x slash} and the open-pollinated families of the pure-species progenitors |
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Authors: | Patricio R Mu?oz Del Valle Dudley A Huber John R Butnor |
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Institution: | (1) School of Forest Resources and Conservation, University of Florida, P.O. Box 110410, Gainesville, FL 32611-0410, USA;(2) Southern Institute of Forest Ecosystems Biology, US Department of Agriculture (USDA) Forest Service, Southern Research Station, 705 Spear Street, South Burlington, VT 05403, USA |
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Abstract: | A single test, including one pseudo-backcross (Pinus elliottii x Pinus taeda) x P. elliottii and open-pollinated families of the pure species progenitors, was established in North Central Florida in December 2007 to
study the transfer of the fast-growing characteristics from a P. taeda L. (loblolly pine) parent into the P. elliottii Engelm. (slash pine) background. Several traits were measured in the first growing season: height growth, phenology, tip
moth incidence, stem traits, crown architectural and needle traits. Heterosis was evaluated for each trait using analyses
of variance by fitting a linear mixed model. All traits were significantly (p value < 0.05) different among families while the significance for heterosis varied by trait. Positive heterosis was found
for average rate of shoot elongation (ASRE), total growth (TG), total height and number of needles per fascicle while the
opposite was true for base diameter, top diameter, fascicle length, fascicle diameter, crown projected area and phenological
traits (cessation, duration and day to reach 50% of the height). Average performance (i.e., no heterosis) was found for initiation
of growth, number of branches, number of nodes, tip moth incidence, sheath length and specific leaf area. The analyses indicated
that introgression of loblolly pine alleles into slash pine was effective and novel trait combinations were achieved. The
pseudo-backcross had larger variation in early height growth than the slash pine families and was taller than all open-pollinated
families at the end of the first season. Tip moth incidence was much lower than the loblolly pine family. |
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