Identification of QTLs influencing wood property traits in loblolly pine (Pinus taeda L.). I. Physical wood properties |
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| Authors: | M M Sewell D L Bassoni R A Megraw N C Wheeler D B Neale |
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| Institution: | (1) Institute of Forest Genetics, USDA Forest Service Department of Environmental Horticulture, University of California, One Shields Avenue, Davis, CA 95667 USA Present address: M.M. Sewell, Environmental Sciences Division, Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831-2008, USA, US;(2) Weyerhaeuser Company, Weyerhaeuser Technology Center 1 E-19, Tacoma, WA 98477 USA, US;(3) Weyerhaeuser Company, Western Forest Research Center, Centralia, WA 98531, USA, US |
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| Abstract: | Physical wood property traits for loblolly pine (Pinus taeda L.) were analyzed for the presence of quantitative trait loci (QTLs) in a three-generation outbred pedigree. These traits
include wood specific gravity (wsg), volume percentage of latewood (vol%), and microfibril angle (mfa). Phenotypic data were collected for rings 2–11 for wsg and vol%, and rings 3, 5 and 7 for mfa. Both earlywood and latewood were analyzed for each trait. An interval mapping approach designed for an outbred pedigree
was used to estimate the number of QTLs, the magnitude of QTL effects, and their genomic position. Nine unique QTLs were detected
for composite traits (average of all rings) for wsg, five for vol%, and five for mfa. The majority of these QTLs were verified by analyses of individual-ring traits. Additional QTLs for each trait were also
detected by these individual-ring analyses. Most QTLs for wsg were specific to either earlywood or latewood, whereas each QTL for mfa was detected for both earlywood and latewood. Before these QTLs are utilized in a breeding program, they should be verified
in larger experiments and in different genetic and environmental backgrounds.
Received: 15 February 2000 / Accepted: 31 March 2000 |
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| Keywords: | Pinus taeda L QTL mapping Wood specific gravity Volume percentage of latewood Microfibril angle |
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