scholarly journals Predicted genetic gains and testing efficiency from two loblolly pine clonal trials

2005 ◽  
Vol 35 (7) ◽  
pp. 1754-1766 ◽  
Author(s):  
Fikret Isik ◽  
Barry Goldfarb ◽  
Anthony LeBude ◽  
Bailian Li ◽  
Steve McKeand
Keyword(s):  
South Carolina ◽  
Loblolly Pine ◽  
Growth Traits ◽  
Field Trials ◽  
Clonal Forestry ◽  
Fusiform Rust ◽  
Genetic Gains ◽  
Rust Infection ◽  
Volume Yield ◽  
Sib Families

Clonal field trials were established at two sites using rooted cuttings from 450 clones of eight full-sib families of loblolly pine (Pinus taeda L.). Height, survival, fusiform rust infection (caused by Cronartium quercuum (Berk) Miyabe ex Shirai f.sp. fusiforme), bole straightness, and diameter were measured after four growing seasons. There were significant differences among full-sib families and among clones within families for all traits studied. Moderately high within-family repeatabilities of clone means (0.50 to 0.75) for growth traits and a very high within-family repeatability of clone means (0.94) for fusiform rust infection were estimated. When the best eight clones were selected regardless of family structure, the volume yield was 52% greater than that of the unimproved seedlings at two sites. Selection of the best two clones from each of four families produced only slightly lower estimated genetic gains than the above scenario. The probability of fusiform rust infection ranged from 0.08 to 0.93 among clones at the South Carolina site. Predicted genetic gain for rust resistance was relatively insensitive to selection intensity, as there were numerous clones with high apparent resistance. The number of ramets per clone necessary to reliably characterize performance on one site was estimated to be between four and six. These results contribute to estimates of the gains available from clonal forestry and will help guide clonal testing and selection programs. Implementation of clonal forestry and cost issues are discussed.

scholarly journals Early Field Growth of Loblolly Pine Rooted Cuttings and Seedlings

2000 ◽  
Vol 24 (2) ◽  
pp. 98-105 ◽  
Author(s):  
John Frampton ◽  
Bailian Li ◽  
Barry Goldfarb
Keyword(s):  
Loblolly Pine ◽  
Large Scale ◽  
Growth Traits ◽  
Volume Growth ◽  
Field Performance ◽  
Rooted Cuttings ◽  
Fusiform Rust ◽  
Rooted Cutting ◽  
Sib Families ◽  
Improvement Programs

Abstract Early growth and fusiform rust resistance of loblolly pine (Pinus taeda L.) rooted cuttings and seedlings from the same nine full-sib families established on two sites (Nassau Co., FL and Monroe Co., AL) were compared. Although site effects on growth were large, height, diameter and volume growth of the rooted cuttings and seedlings did not differ through the first six growing seasons in the field (with the exception of first year height growth at the Florida site). Fusiform rust (caused by Cronartium quercuum [Berk.] Miyabe ex Shirai f. sp. fusiforme [Cumm.] Burds. et Snow) incidence at age 6 yr was significantly lower in the rooted cuttings than the seedlings at both the Florida site (15.6 versus 22.3 %, respectively) and the Alabama site (46. 0 versus 51.0%, respectively). In addition, correlations of full-sib family performance between (1) rooted cuttings and seedlings and (2) rooted cuttings and seedling progeny test data were positive, statistically significant and moderate to high for both growth traits and fusiform rust incidence. Thus, families or individual trees selected from seedling genetic tests in existing tree improvement programs should also perform well as rooted cuttings. These results and those from similar studies indicate that field performance of loblolly pine rooted cuttings derived from seedling hedges should not be a concern. Large-scale propagation using rooted cuttings will deliver predicted gains from the selection and deployment of elite full-sib families and clones. In addition, the use of rooted cutting planting stock may offer a further reduction in fusiform rust incidence. South. J. Appl. For. 24(2):98-105.

scholarly journals Genetic analysis of early field growth of loblolly pine clones and seedlings from the same full-sib families

2007 ◽  
Vol 37 (1) ◽  
pp. 195-205 ◽  
Author(s):  
Brian S Baltunis ◽  
Dudley A Huber ◽  
Timothy L White ◽  
Barry Goldfarb ◽  
Henry E Stelzer
Keyword(s):  
Loblolly Pine ◽  
Genetic Variance ◽  
Recurrent Selection ◽  
Growth Traits ◽  
Genetic Correlations ◽  
Field Trials ◽  
Population Based ◽  
Environment Interaction ◽  
Clonal Population ◽  
Sib Families

Field trials established with clones and seedlings from the same families provide an opportunity for comparing full-sib family performance across propagule types. More than 1200 different clones together with over 14 000 zygotic seedlings from the same 61 full-sib families of loblolly pine (Pinus taeda L.) were tested on multiple sites across Florida and Georgia. The genetic variance associated with several early growth traits partitioned differently depending on propagule type. Most of the genetic variance associated with growth in the clonal population was additive, while the estimate of dominance in the seedling population was greater than estimates of dominance in the clonal population, based on single-site analyses. Apparently, a lack of randomization of the seedlings prior to field establishment caused full-sib families to appear more different, inflating estimates of dominance genetic variance. Parental and full-sib family ranks were stable regardless of propagule type as indicated by type B genetic correlations. In the clonal population, little genotype × environment interaction was observed across sites at the parental, family, and clonal levels for all traits. The high genetic correlations between propagule types provide further assurance that selections made through traditional tree-improvement activities for recurrent selection for general combining ability in seedling trials can also be used successfully for breeding families to test in a clonal forestry program.

scholarly journals Families of loblolly pine that are the most stable for resistance to fusiform rust are the least predictable

2003 ◽  
Vol 33 (7) ◽  
pp. 1335-1339 ◽  
Author(s):  
S E McKeand ◽  
H V Amerson ◽  
B Li ◽  
T J Mullin
Keyword(s):  
Loblolly Pine ◽  
Coefficient Of Determination ◽  
Rust Disease ◽  
Infection Level ◽  
Fusiform Rust ◽  
Rust Infection ◽  
Average Coefficient ◽  
Pinus Taeda L ◽  
The Individual ◽  
Pathogen Populations

In an extensive series of trials with open-pollinated families of loblolly pine (Pinus taeda L.), resistance to fusiform rust disease (caused by Cronartium quercuum (Berk.) Miyabe ex Shirai f. sp. fusiforme) at individual test sites was relatively unpredictable for the families deemed most resistant. The most resistant families were also the most stable for performance across test sites, with stability defined as the slope of the regression of family means for rust infection versus site means for rust infection. A family's R-50 value (its predicted rust infection level when the site mean infection is 50%) was correlated to its stability parameter or slope (r = 0.78). On average, any one family's level of infection (% galled) was reasonably predictable for any given infection level at a given site; the average coefficient of determination (r2) was 0.78 for the regression of family means for rust infection versus site means for rust infection. However, the six most stable families for resistance had the lowest r2 values (average r2 = 0.58). We speculated that the lower predictability for the most resistant families was due to interactions of specific resistance genes in these families and corresponding avirulence and (or) virulence levels in the pathogen populations that may differ among sites. Although the predictability of the individual resistant families was relatively low, if these families were bulked into a resistant seed lot, they performed in a more predictable manner with r2 = 0.74 for the regression of the bulk mean versus site means. Bulks of four to six highly resistant families appeared to be a good solution to obtain stable and predictable performance across a range of sites.

Sewage Sludge Increases Early Growth and Decreases Fusiform Rust Infection of Nursery-Run and Rust-Resistant Loblolly Pine

1989 ◽  
Vol 13 (2) ◽  
pp. 68-71 ◽  
Author(s):  
Douglas M. Stone ◽  
Harry R. Powers
Keyword(s):  
Sewage Sludge ◽  
Loblolly Pine ◽  
Volume Growth ◽  
Early Growth ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
First Year ◽  
Average Height ◽  
Fusiform Rust ◽  
Rust Infection

Abstract An intensively prepared site in a high-rust hazard area was fertilized with municipal sewage sludge to provide 300 or 600 lb/ac total nitrogen before planting nursery-run and fusiform rust-resistant seedlings. Rust-resistant seedlings had significantly greater first-year survival andsignificantly lower rust infection at age 6. The sludge treatments increased 6-year diameter and volume growth and decreased rust infection significantly; there were no differences between the two sludge levels. Sludge fertilization significantly increased average height, diameter, and stemvolume of the largest 300 trees/ac and has begun to stimulate crown class differentiation. The greater growth of the larger trees did not alter the proportion infected by rust. Results indicate that even in areas of high-rust hazard, intensive site preparation and sludge fertilization canincrease early growth and accelerate stand development of loblolly pine if rust-resistant stock is planted. South J. Appl. For. 13(2):68-71.

Relation of Nantucket Pine Tip Moth Attack and Fusiform Rust Infection in Loblolly Pine Families

1991 ◽  
Vol 15 (4) ◽  
pp. 204-208 ◽  
Author(s):  
Roy L. Hedden ◽  
Roger P. Belanger ◽  
Harry R. Powers ◽  
Thomas Miller
Keyword(s):  
Loblolly Pine ◽  
Cost Effective ◽  
Growth And Yield ◽  
Insecticide Treatment ◽  
Fusiform Rust ◽  
Rust Infection ◽  
Nantucket Pine Tip Moth ◽  
Combined Control ◽  
Economic Analyses ◽  
The Relationship

Abstract The relationship between pine tip moth attack and fusiform rust infection was studied in a 12-year-old loblolly pine stand in Houston County, GA. Four pine families were selected for study, and 24 trees of each family were felled for evaluation. The lower 8 ft of each tree was cut into two 4-ft sections and split to reveal the pith. Each section was examined for evidence of pine tip moth attack and the presence of fusiform rust galls. The analysis revealed 476 tip moth attacks and 99 fusiform rust galls. Forty-six of the rust galls occurred at the same place as a tip moth attack. These results, when combined with those of previous studies, suggest that the control of the pine tip moth may reduce the incidence of fusiform rust. Growth and yield simulations and economic analyses indicate that insecticide treatment of loblolly pine for the combined control of the pine tip moth and the associated reduction in levels of fusiform rust infection may be potentially cost effective in stands managed for sawtimber, but not for pulpwood. South. J. Appl. For. 15(4):204-208.

Loblolly Pine Seed Sources Differ in Susceptibility to the Southern Pine Beetle in South Carolina

1992 ◽  
Vol 16 (4) ◽  
pp. 169-174 ◽  
Author(s):  
H. R. Powers ◽  
R. P. Belanger ◽  
W. D. Pepper ◽  
F. L. Hastings
Keyword(s):  
South Carolina ◽  
Disease Resistance ◽  
Loblolly Pine ◽  
Slash Pine ◽  
Southern Pine Beetle ◽  
Southern Pine ◽  
Fusiform Rust ◽  
Seed Sources ◽  
Pine Beetle ◽  
Stand Characteristics

Abstract In a planting near Aiken, SC, loblolly pine saplings from an eastern seed source were significantly more susceptible to the southern pine beetle (SPB) than were loblolly saplings from western seed sources. Two eastern sources of slash pine also resisted beetle attack. Study plots wereoriginally established to evaluate disease resistance and growth of fusiform rust resistant and susceptible seed lots. There was no relationship between stand characteristics or rust infection patterns and SPB damage. South. J. Appl. For. 16(4):169-174

Five Fusiform Rust-Resistant Seed Sources in Coastal South Carolina: A Field Comparison

1987 ◽  
Vol 11 (4) ◽  
pp. 198-201
Author(s):  
H. R. Powers ◽  
F. R. Matthews
Keyword(s):  
South Carolina ◽  
Pinus Taeda ◽  
Rust Resistance ◽  
Height Growth ◽  
Growth Potential ◽  
Good Growth ◽  
Fusiform Rust ◽  
Rust Infection ◽  
Seed Sources ◽  
Resistant Sources

Abstract Bulk collections of seeds from five fusiform rust-resistant sources of loblolly (Pinus taeda) and slash (P. elliottii var. elliottii) pines were tested for disease resistance and growth potential in coastal South Carolina. Texas and Arkansas loblolly had significantly less rust than trees from other seed sources, although all five resistant sources had significantly less rust infection than commercial checks. Texas loblolly has excellent height growth and was not significantly different from the top-ranked loblolly commercial checks. Arkansas loblolly, although excellent for rust resistance, attained the least height. Trees from the loblolly and slash pine rust-resistant orchards also had good growth and rust resistance. Livingston Parch (Louisiana) loblolly seedlings, which have been widely planted in the South, were not significantly different from the rust-resistant loblolly orchard seedlings in either growth or rust infection. Survival of all seed sources in the test was satisfactory; however, the Livingston Parish and slash commercial check had significantly fewer surviving trees. South. J. Appl. For. 11(4):198-201.

Accelerated short-term genetic testing for loblolly pine families

1988 ◽  
Vol 18 (8) ◽  
pp. 1085-1089 ◽  
Author(s):  
Claire G. Williams
Keyword(s):  
Genetic Testing ◽  
Loblolly Pine ◽  
Growth Traits ◽  
Genetic Correlations ◽  
Field Trials ◽  
Day Length ◽  
Short Term ◽  
Test Environment ◽  
Short Term Test ◽  
Extreme Performance

The following experiment was done to test the hypothesis that acceleration of seedling growth increases the juvenile–mature correlation for growth. Growth traits of 18 open-pollinated loblolly pine (Pinustaeda) familes were compared across (i) field trials measured 8 years after planting (mature age), (ii) a short-term test environment with a supplemental incandescent light source (20-h photoperiod) and a higher fertilizer level, and (iii) a short-term test environment with no supplemental day length and a lower fertilizer level. The ranking of two seedlots of known, extreme performance and the juvenile–mature correlations were used as the criteria of early testing success. Juvenile–mature (family mean) correlations were low (r = 0.13) for the growth-accelerating environment relative to the natural day length environment (r = 0.59) and two check seedlots ranked correctly only in the natural day length environment. The genetic correlations between the short-term tests are high for total height [Formula: see text] but lower for height produced after first budset, the trait that has shown value as a juvenile indicator [Formula: see text] The growth-accelerating treatment increases growth per unit time but prompts abnormal shoot development. The nonaccelerating treatment with no supplemental light offered the most promise for genetic testing of 1st-year loblolly pine seedlings.

Performance of Unthinned Loblolly and Slash Pine Plantations on Three Sites in South Carolina

1977 ◽  
Vol 1 (4) ◽  
pp. 8-10
Author(s):  
D. H. Van Lear ◽  
N. B. Goebel ◽  
J. G. Williams
Keyword(s):  
South Carolina ◽  
Pinus Taeda ◽  
Loblolly Pine ◽  
Slash Pine ◽  
The Other ◽  
Fusiform Rust ◽  
Growth And Survival ◽  
Growing Seasons ◽  
Pinus Taeda L ◽  
Region Growth

Abstract The performance of adjacent unthinned plantations of loblolly (Pinus taeda L.) and slash pine (P. elliottii Engelm.) on three sites in South Carolina was evaluated after 16 growing seasons. Sites ranged from a noneroded Piedmont soil to an excessively drained sandy soil of the Sandhills physiographic region. Growth and survival varied widely among sites, with greatest productivity occurring in the Piedmont and the lowest in the Congaree Sandhills. Despite the droughty nature of the latter site, survival after 16 growing seasons was over 80 percent for both species. On a volume basis, loblolly pine outperformed slash pine at the upper Pidemont and Aiken Plateau sites, while slash pine was superior on the dry Sandhills site. Incidence of fusiform rust was much higher for both species at the Aiken Plateau than at the other sites.

Annual variation in fusiform rust infection of slash and loblolly pine seed lots in time-replicated plantings

1989 ◽  
Vol 19 (12) ◽  
pp. 1531-1537
Author(s):  
R. C. Froelich
Keyword(s):  
Loblolly Pine ◽  
Annual Variation ◽  
Disease Incidence ◽  
Growing Season ◽  
Slash Pine ◽  
Family Interactions ◽  
Fusiform Rust ◽  
Rust Infection ◽  
Location Family ◽  
High Hazard

Trees from two putatively fusiform rust resistant and two susceptible seed lots of slash pine (Pinuselliottii Engelm. var. elliottii) and loblolly pine (P. taeda L.) were planted in 4 or 5 consecutive years at three locations in south Mississippi and examined annually for rust galls that originated the previous year. Disease incidence was usually less than 20% in the first growing season. Resistant and susceptible slash pine had light incidence of rust after about age 5. The susceptible lobloly pine often developed considerable numbers of branch galls after the fifth season, but most were several metres from the main stem of the trees. The resistant loblolly pine of Livingston Parish, Louisiana, never developed more than 23% infection in any 1 year in thirty 80-tree plots. The three remaining seed lots often exceeded 50% infection in some years, but differences among seed lots were usually small. Rankings of the four species seed lots or the six families that made up the resistant slash seed lot varied by trial (year planted and year infected). Replicating experiments in time on high-hazard sites for rust should better define occurrence and importance of location × family interactions.

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