scholarly journals Date of earlywood-latewood transition in provenances and families of loblolly pine, and its relationship to growth phenology and juvenile wood specific gravity

1997 ◽  
Vol 27 (8) ◽  
pp. 1245-1253 ◽  
Author(s):  
K JS Jayawickrama ◽  
S E McKeand ◽  
J B Jett ◽  
E A Wheeler
Keyword(s):  
Specific Gravity ◽  
Loblolly Pine ◽  
Juvenile Wood ◽  
Wood Specific Gravity

Juvenile wood specific gravity of loblolly pine tissue culture plantlets and seedlings

1989 ◽  
Vol 19 (10) ◽  
pp. 1347-1350 ◽  
Author(s):  
L. J. Frampton Jr. ◽  
J. B. Jett
Keyword(s):  
Tissue Culture ◽  
Specific Gravity ◽  
Loblolly Pine ◽  
Juvenile Wood ◽  
Substantial Improvement ◽  
Culture Techniques ◽  
Wood Specific Gravity ◽  
Significant Difference ◽  
Single Clone ◽  
Tissue Culture Plantlets

Juvenile-wood specific gravity of loblolly pine (Pinustaeda L.) tissue culture plantlets and seedlings were compared. Wood samples collected from several (6 to 13) families at three sites, each at a different age (2, 3, and 6 years), showed a significant difference between the overall plantlet and seedling mean specific gravity only in the youngest material (0.387 versus 0.356, respectively). Another collection of wood samples from three different sites at age 5 years showed that the within-site variation in specific gravity for a single clone was 29% that of the open-pollinated family from which it was derived. When tissue culture techniques become practical, operational clonal plantations of loblolly pine should offer substantial improvement in the uniformity of wood produced relative to the heterogeneous seedling-origin plantations currently being established.

Place of Wood Specific Gravity in the Development of Advanced-Generation Seed Orchards and Breeding Programs

1982 ◽  
Vol 6 (3) ◽  
pp. 177-180
Author(s):  
J. B. Jett ◽  
J. T. Talbert
Keyword(s):  
Specific Gravity ◽  
Loblolly Pine ◽  
Second Generation ◽  
Improvement Program ◽  
Breeding Programs ◽  
The North ◽  
Wood Specific Gravity ◽  
High Heritability ◽  
Pinus Taeda L ◽  
Advanced Generation

Abstract Data from thinnings of 11 genetic tests with an average age of 10 years and from 364 eight-year-old second-generation selections were analyzed to provide an estimate of gain from one cycle of selection for wood specific gravity. Utilizing mid-parent, mature, wood specific gravities and progeny juvenile wood specific gravities, coefficients of genetic prediction, CGP = 0.55 and 0.41, were calculated for the genetic test thinning sample and second-generation selection sample. Expressed as a percentage of the mean, gain from selection was calculated to be 2.6 percent. A strategy was also developed to include wood specific gravity in the North Carolina State Cooperative's second-generation loblolly pine (Pinus taeda L.) improvement program. High heritability figures indicate little need to develop extensive family information for wood specific gravity in advanced-generation breeding programs.

Aerial Fertilization Increases Volume and Weight of Planted Loblolly Pine

1978 ◽  
Vol 2 (4) ◽  
pp. 118-120 ◽  
Author(s):  
Julian R. Beckwith ◽  
Mervin Reines
Keyword(s):  
Specific Gravity ◽  
Loblolly Pine ◽  
Wood Properties ◽  
Pine Plantations ◽  
Relative Reduction ◽  
Wood Specific Gravity

Abstract Two loblolly pine plantations were examined after one was fertilized by airplane, and wood properties of dominant and co-dominant trees in each were compared. Although there was a relative reduction in wood specific gravity after fertilization, the data suggest that treated trees produced a greater weight of wood per tree than did the controls.

Effects of Specific Gravity and Wood Chemical Content on the Pulp Yield of Loblolly Pine

TAPPI Journal ◽  
2009 ◽  
Vol 8 (4) ◽  
pp. 31-36 ◽  
Author(s):  
DAVID E. WHITE ◽  
CHARLES COURCHENE ◽  
THOMAS MCDONOUGH ◽  
LAURIE SCHIMLECK ◽  
DAVID JONES ◽  
...  
Keyword(s):  
Specific Gravity ◽  
Loblolly Pine ◽  
Kraft Pulp ◽  
Near Infrared ◽  
Genetic Selection ◽  
Nir Spectroscopy ◽  
Pulp Yield ◽  
Wood Specific Gravity ◽  
Pine Trees ◽  
Chemical Content

We quantified the effects of wood density (chip specific gravity) and wood chemical composition (cellulose, hemicellulose, and lignin) on the kraft pulp yield of 13-year-old loblolly pine trees (Pinus taeda) grown as part of a genetic selection study. Both bleachable (kappa No. 30) and linerboard grade (kappa No. 100) pulps were made from 18 trees selected for combinations of wood specific gravity and cellulose:hemicellulose:lignin ratios. Statistical analysis indicated that digester pulp yield correlated significantly with wood xylan content and cellulose-to-lignin ratio but was not strongly correlated to wood specific gravity. Near infrared (NIR) spectra were collected from wood samples and correlated with the total kraft pulp yields. The analyses for both kappa No. 30 and kappa No. 100 pulps provided strong calibration statistics, suggesting that papermakers can use NIR spectroscopy to esti-mate the bleachable and linerboard grade pulp yields of P. taeda whole-tree samples.

Stability of juvenile wood specific gravity of loblolly pine in diverse geographic areas

1991 ◽  
Vol 21 (7) ◽  
pp. 1080-1085 ◽  
Author(s):  
J. B. Jett ◽  
S. E. McKeand ◽  
R. J. Weir
Keyword(s):  
Specific Gravity ◽  
Loblolly Pine ◽  
Environment Interaction ◽  
Sample Distribution ◽  
Genotype Environment Interaction ◽  
Wood Specific Gravity ◽  
Potential Gain ◽  
Natural Range ◽  
The Stability ◽  
East West

The stability of wood specific gravity for 12-year-old loblolly pine (Pinustaeda L.) was evaluated for 18 open-pollinated families and four bulked seed lots representing provenances from the eastern shore of Maryland; Marion County, Florida; Gulf Hammock, Florida; and Livingston Parish, Louisiana. Wood samples were collected from seven plantings chosen to provide a north–south and east–west sample distribution essentially encompassing an area spanning the natural range of loblolly pine. There was significant genotype × environment interaction, and 4 of the 18 families were classified as unstable for specific gravity. These four families accounted for 49.5% of the genotype × environment interaction sum of squares. However, the loss in potential gain in a breeding program for specific gravity due to the presence of a significant genotype × environment interaction was estimated to be only 1%. Loblolly pine from the Florida provenances and from the widely planted Livingston Parish provenance consistently displayed low specific gravity and ranked at or near the bottom at all test locations, including the southernmost plantings.

Juvenile–mature relationships and heritability estimates of several traits in loblolly pine (Pinustaeda)

1984 ◽  
Vol 14 (6) ◽  
pp. 822-825 ◽  
Author(s):  
Judy A. Loo ◽  
C. G. Tauer ◽  
J. P. van Buijtenen
Keyword(s):  
Specific Gravity ◽  
Loblolly Pine ◽  
Genetic Correlations ◽  
Negative Relationship ◽  
Genetic Prediction ◽  
Tracheid Length ◽  
Wood Specific Gravity ◽  
Strong Negative Relationship ◽  
Heritability Estimates ◽  
Genetic Covariances

Heritability estimates for wood specific gravity of loblolly pine (Pinustaeda L.) in east Texas were high and relatively constant for all ages of wood sampled, but tracheid length was found to have low heritability at all ages. Heritability estimates for tracheid length declined with age after age 4 years. Coefficients of genetic prediction indicated that specific gravity of age 2 wood is a reliable predictor of wood specific gravity at age 25. Genetic covariances between juvenile and mature tracheid length were approximately zero. Coefficients of genetic prediction and genetic correlations between specific gravity and height and diameter at age 20 years indicated a strong negative relationship.

scholarly journals Identification of quantitative trait loci influencing wood specific gravity in an outbred pedigree of loblolly pine.

Genetics ◽  
1994 ◽  
Vol 138 (4) ◽  
pp. 1293-1300
Author(s):  
A Groover ◽  
M Devey ◽  
T Fiddler ◽  
J Lee ◽  
R Megraw ◽  
...  
Keyword(s):  
Quantitative Trait Loci ◽  
Specific Gravity ◽  
Loblolly Pine ◽  
Quantitative Trait ◽  
Marker Locus ◽  
Multiple Alleles ◽  
Wood Specific Gravity ◽  
Trait Loci ◽  
Marker Loci ◽  
Pinus Taeda L

Abstract We report the identification of quantitative trait loci (QTL) influencing wood specific gravity (WSG) in an outbred pedigree of loblolly pine (Pinus taeda L.). QTL mapping in an outcrossing species is complicated by the presence of multiple alleles (> 2) at QTL and marker loci. Multiple alleles at QTL allow the examination of interaction among alleles at QTL (deviation from additive gene action). Restriction fragment length polymorphism (RFLP) marker genotypes and wood specific gravity phenotypes were determined for 177 progeny. Two RFLP linkage maps were constructed, representing maternal and paternal parent gamete segregations as inferred from diploid progeny RFLP genotypes. RFLP loci segregating for multiple alleles were vital for aligning the two maps. Each RFLP locus was assayed for cosegregation with WSG QTL using analysis of variance (ANOVA). Five regions of the genome contained one or more RFLP loci showing differences in mean WSG at or below the P = 0.05 level for progeny as grouped by RFLP genotype. One region contained a marker locus (S6a) whose QTL-associated effects were highly significant (P > 0.0002). Marker S6a segregated for multiple alleles, a prerequisite for determining the number of alleles segregating at the linked QTL and analyzing the interactions among QTL alleles. The QTL associated with marker S6a appeared to be segregating for multiple alleles which interacted with each other and with environments. No evidence for digenic epistasis was found among the five QTL.

Wood Specific Gravity in Species from Two Tropical Forests in Mexico

IAWA Journal ◽  
1987 ◽  
Vol 8 (2) ◽  
pp. 143-148 ◽  
Author(s):  
Josefina Barajas-Morales
Keyword(s):  
Specific Gravity ◽  
Tropical Forests ◽  
Tropical Rainforest ◽  
Deciduous Forest ◽  
Woody Species ◽  
T Test ◽  
Tropical Deciduous Forest ◽  
Wood Specific Gravity ◽  
Dry Deciduous Forest

The specific gravity of 220 woody species, half of them from a tropical rainforest, half from a tropical deciduous forest was measured. The two groups were compared using a Student t-test. The results show highly significant differences in specific gravity between the species from the two areas: woods from the dry deciduous forest tend to be much heavier than those from the rainforest.

Sign in / Sign up

Export Citation Format

Share Document