Inheritance of foliar stable carbon isotope discrimination and third-year height in Pinus taeda clones on contrasting sites in Florida and Georgia |
| |
Authors: | Brian S Baltunis Timothy A Martin Dudley A Huber John M Davis |
| |
Institution: | (1) Forest Biosciences, CSIRO, P.O. Box E4008, Kingston, 2604, Australian Capital Territory, Australia;(2) School of Forest Resources and Conservation, University of Florida, P.O. Box 110410, Gainesville, FL, USA;(3) Genetics Institute, University of Florida, P.O. Box 110410, Gainesville, FL, USA |
| |
Abstract: | Quantifying foliar stable carbon isotope discrimination (Δ) is a powerful approach for understanding genetic variation in
gas exchange traits in large populations. The genetic architecture of Δ and third-year height is described for more than 1,000
clones of Pinus taeda tested on two contrasting sites. for Δ was 0.14 (±0.03), 0.20 (±0.07), and 0.09 (±0.04) at Florida, Georgia, and across sites, respectively. for stable carbon isotope discrimination ranged from 0.25 (±0.03) at the Florida site to 0.33 (±0.03) at the Georgia site,
while the across-site estimate of was 0.19 (±0.02). For third-year height, ranged from 0.13 (±0.05) at the Georgia site to 0.20 (±0.06) at the Florida site with an across-site estimate of 0.09 (±0.05).
Broad-sense heritability estimates for third-year height were 0.23 (±0.03), 0.28 (±0.03), and 0.13 (±0.02) at the Florida
site, Georgia site, and across sites, respectively. Type B total genetic correlation for Δ was 0.70 ± 0.06, indicating that
clonal rankings were relatively stable across sites, while for third-year height, rankings of clones were more unstable across
the two trials . Third-year height and Δ were negatively correlated at the parental , full-sib family , and clonal levels, suggesting that genetic variation for Δ in P. taeda may be a result of differences in photosynthetic capacity. We conclude that Δ may be a useful selection trait to improve
water-use efficiency and for guiding deployment decisions in P. taeda. |
| |
Keywords: | Stable carbon isotope discrimination Clones Pinus taeda |
本文献已被 SpringerLink 等数据库收录! |
|