Title: Genetic variation in the microfibril angle of loblolly pine from two test sites
Author: Myszewski, Jennifer H.; Bridgwater, Floyd E.; Lowe, William J.; Byram, Thomas D.; Megraw, Robert A.;
Source: Southern Journal of Applied Forestry 28(4) 196-204.
Publication Series: Miscellaneous Publication
Description: In recent years, several studies have examined the effect of microfibril angle (MFA) on wood quality. However, little research has been conducted upon the genetic mechanisms controlling MFA. In this study, we examined the heritability of MFA in loblolly pine, Pinus taeda L., and its genetic relationships with height, diameter, volume, and specific gravity. Increment cores were collected at breast height from 20 to 25 progeny from each of 12 to 17 crosses (among 11 parents) in two modified partial-diallels in different locations in southern Arkansas. Specific gravity was measured on segments containing rings 1 through 5 and on segments containing rings 6 through 20. MFA was measured on the earlywood and latewood sections of rings 4, 5, 19, and 20. Rings 4 and 5 were chosen as representative of core wood and rings 19 and 20 as representative of outer wood. Analyses of variance revealed statistically significant genetic and environmental influences on MFA. Significant general combining ability (GCA), specific combining ability (SCA), and SCA X block effects indicated that there are both additive and nonadditive genetic influences on MFA. Individual-tree, narrow-sense heritability estimates were variables, ranging from 0.17 for earlywood (rings) 4 MFA to 0.51 for earlywood (ring) 20 MFA. Genetic correlations between MFA, specific gravity, and the growth traits were nonsignificant due to large estimated standard errors.
Keywords: Pinus taeda, microfibril angle (MFA), heritability, genetic correlation, specific gravity
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
- You may send email to email@example.com to request a hard copy of this publication. (Please specify exactly
which publication you are requesting and your mailing address.)
XML: View XML
Myszewski, Jennifer H.; Bridgwater, Floyd E.; Lowe, William J.; Byram, Thomas D.; Megraw, Robert A. 2004. Genetic variation in the microfibril angle of loblolly pine from two test sites. Southern Journal of Applied Forestry 28(4) 196-204.
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility