Inventory Monitoring for Estimating Impact of Insects on Seed Production in a Douglas-Fir Seed Orchard in Western Oregon

1988 ◽  
Vol 81 (1) ◽  
pp. 281-285 ◽  
Author(s):  
S. A. Dombrosky ◽  
T. D. Schowalter
Keyword(s):  
Seed Production ◽  
Seed Orchard ◽  
Douglas Fir

IMPACT OF EMIGRATING SEED CHALCID, MEGASTIGMUS SPERMOTROPHUS WACHTL(HYMENOPTERA: TORYMIDAE), ON SEED PRODUCTION IN A DOUGLAS-FIR SEED ORCHARD IN FRANCE AND MODELLING OF ORCHARD INVASION

1997 ◽  
Vol 129 (1) ◽  
pp. 7-19 ◽  
Author(s):  
Marc Jarry ◽  
Jean-Noël Candau ◽  
Alain Roques ◽  
Bernard Ycart
Keyword(s):  
Seed Production ◽  
Seed Orchard ◽  
Douglas Fir ◽  
Passive Diffusion ◽  
Low Density

AbstractThe invasion of a Douglas-fir seed orchard by host-specific seed chalcids immigrating from the surrounding plantations of Douglas-fir has been monitored for a 10-year period. The orchard cone crop was entirely harvested every year to prevent the establishment of a resident chalcid population. Over the 10 years the percentage of infested seeds resulting from the immigration of seed chalcids ranged from 0.88 to 91.0%. A model to forecast the importance of annual seed orchard infestation by immigrating populations is proposed. This model is based on passive diffusion of females emerging in the surrounding plantations with a downwind drift. Only a few plantations located within a radius of 5 km from the orchard appeared to contribute significantly to orchard infestation. Settlement of Douglas-fir orchard in regions with low density of conspecific trees and annual harvest of cones are suggested to limit the importance and regularity of seed chalcid damage.

Effect of different inbreeding levels on filled seed production in Douglas-fir

1989 ◽  
Vol 19 (1) ◽  
pp. 54-59 ◽  
Author(s):  
J. H. Woods ◽  
J. C. Heaman
Keyword(s):  
Linear Relationship ◽  
Total Variation ◽  
Seed Production ◽  
Second Generation ◽  
Seed Orchard ◽  
Douglas Fir ◽  
Inbreeding Coefficient ◽  
Parental Effects ◽  
Breeding Programs

Matings of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) were performed to develop inbreeding levels with inbreeding coefficient (F) values from 0.0 to 0.75. A strong inverse linear relationship was found between filled seed per cone and F at values ≤0.5. The following mean filled seed per cone values were obtained: outcross (F = 0.0), 31.6; half-sib cross (F = 0.125), 21.3; full-sib cross (F = 0.25), 16.7; parent–offspring backcross (F = 0.25), 15.5; self (F = 0.5), 1.2; second generation self (F = 0.75), 0.03. Parental effects on filled seed per cone were large, accounting for about 50% of the total variation. The use of related clones in a seed orchard will result in less inbred seed than expected under total panmixia, owing to decreased filled seed production at all inbred levels. Also, breeding programs will require increased effort to obtain seed when mating designs include crosses between related trees.

A Canadian Example of Government-Industry Collaboration In Tree Improvement

1976 ◽  
Vol 52 (6) ◽  
pp. 283-289 ◽  
Author(s):  
C. W. Yeatman
Keyword(s):  
Seed Production ◽  
Cold Hardiness ◽  
Seed Orchard ◽  
Jack Pine ◽  
Tree Improvement ◽  
Seed Sources ◽  
Seedling Seed Orchard ◽  
Forest Region ◽  
Future Supply ◽  
High Quality Seed

A program of provenance testing, seed production and genetic improvement of jack pine was developed in the Baskatong region of western Quebec through sustained collaboration among government forest services and forest industry. Research plantations demonstrated, within a period of 10 years from establishment, the superiority in growth, cold hardiness and disease resistance of regionally adapted local seed sources. Critical differences were evident between provenances from the Boreal Forest Region and those from the adjacent Sections of the Great Lakes — St. Lawrence Forest Region.A 300-acre (120 ha) seed production area was created within a genetically superior jack pine population of natural origin in the Côte Jaune area west of Lake Baskatong. Within this population, 325 plus trees were selected, marked and recorded over two years by student crews employed in the summer. Seed harvested from the felled plus trees will be used to create a seedling seed orchard and to establish progeny tests. The plus trees are to be grafted for controlled breeding among selected progeny-tested clones at a later date. This cooperative program of tree improvement will ensure the future supply of high quality seed that will maintain and enhance the value of the forest resource.

Seed and cone production in a clonal orchard of jack pine (Pinusbanksiana)

1981 ◽  
Vol 11 (3) ◽  
pp. 512-516 ◽  
Author(s):  
Michael N. Todhunter ◽  
R. Brooks Polk
Keyword(s):  
Seed Production ◽  
Seed Orchard ◽  
Jack Pine ◽  
Cone Production ◽  
Total Seed

Seed and cone production in Pinusbanksiana Lamb. was studied using clonal material. Variables studied included sound seed per cone, sound seed percentage, seed efficiency, total seed per cone, seed potential, and total number of cones in relation to site, clone, and position in the crown. The clonal effect was highly significant for all variables. Site and crown location were significant for all but seed total and number of cones. Due to the variability present, cone and seed production should be taken into account in seed orchard design, tree selection, and breeding.

Marginal analysis and cost effectiveness in seed orchard management

1987 ◽  
Vol 17 (6) ◽  
pp. 510-515 ◽  
Author(s):  
Thomas A. Thomson ◽  
Donald T. Lester ◽  
Jeanne A. Martin
Keyword(s):  
Seed Production ◽  
Analytical Techniques ◽  
Cost Effective ◽  
Seed Orchard ◽  
Induction Treatment ◽  
Marginal Analysis ◽  
Orchard Management ◽  
Improvement Programs ◽  
Four Quadrant ◽  
The Cost

We use marginal analysis for three seed orchard management decisions. First we consider the roguing of a seed orchard established with many untested trees. We show that inferior parents should be rogued to the point where the number of orchard trees times the average expected volume gain of trees from seed produced by that orchard is maximized. Marginal analysis also is useful where one must choose the number of trees to establish in an orchard planted after progeny tests have identified superior parents. The cost of establishing many ramets to meet early seed production goals can be balanced with the projected value of seed. For the example presented, an additional orchard tree is cost effective if its seed is needed at an orchard age of 12 to 15 years. Finally, we use marginal analysis to determine whether to induce a seed orchard to increase its seed production when there is an excess demand for seed. This decision is guided by balancing the cost of the induction treatment with the combined effect of expected increase in seed harvest, the amount of genetic gain, and the discount rate. We present a four-quadrant decision diagram for estimating this balance. In designing tree improvement programs, these analytical techniques can be applied to proposed alternatives as one way to structure decision making and to provide comparable economic assessments from which cost-effective choices can be made.

Pollen contamination and mating patterns in a Douglas-fir seed orchard as measured by simple sequence repeat markers

2005 ◽  
Vol 35 (7) ◽  
pp. 1592-1603 ◽  
Author(s):  
Gancho T Slavov ◽  
Glenn T Howe ◽  
W Thomas Adams
Keyword(s):  
Ssr Markers ◽  
Simple Sequence Repeat ◽  
Female Parent ◽  
Seed Orchard ◽  
Douglas Fir ◽  
Sequence Repeat ◽  
Female Receptivity ◽  
Mating Patterns ◽  
Pollen Contamination ◽  
Simple Sequence

Pollen contamination is detrimental to the genetic quality of seed orchard crops. Highly variable simple sequence repeat (SSR) markers make it possible to accurately measure pollen contamination and characterize patterns of within-orchard mating by directly identifying the male and female parent of each seed produced in the orchard. We used nine SSR markers to measure pollen contamination and characterize mating patterns based on seed samples collected in 3 years (1999, 2000, and 2003) from one block of a nonisolated, open-pollinated, clonal seed orchard of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in western Oregon. Pollen contamination was consistently high across the 3 years (mean = 35.3%, range = 31.0%-41.3%) and appeared to result primarily from cross-pollination among the orchard blocks. Levels of pollen contamination varied substantially among clones and were higher in clones with early female receptivity (mean = 55.5%) than in those with either mid (mean = 36.4%) or late (mean = 28.3%) female receptivity. We detected low rates of self-pollination (mean = 1.8% per clone) and over 10-fold differences in the relative paternal contributions of the clones. There was a clear pattern of positive assortative mating with respect to floral phenology. This study illustrates that SSR markers are powerful tools for characterizing seed lots and improving the design and management of Douglas-fir seed orchards.

scholarly journals Survival and Growth of Douglas-Fir Relating to Weeding, Fertilization, and Seed Source

1996 ◽  
Vol 11 (2) ◽  
pp. 62-69 ◽  
Author(s):  
Brian E. Roth ◽  
Michael Newton
Keyword(s):  
Weed Control ◽  
Nitrogen Fertilization ◽  
Seedling Survival ◽  
Seed Orchard ◽  
Douglas Fir ◽  
Seed Source ◽  
Interactive Effects ◽  
Dominant Factor ◽  
Local Source ◽  
Survival And Growth

Abstract The goal of this study was to quantitatively evaluate the individual and interactive effects of weed control, nitrogen fertilization, and seed source on Douglas-fir (Pseudotsuga menziesii) survival and growth in a range of sites and growing conditions in western Oregon. Weed control was the dominant factor influencing seedling survival and growth and accounted for 49% of the explained variation in seedling volume after 2 yr. Nitrogen fertilization had no effect when used in conjunction with weed control and a negative effect when used without weed control. Seedlings from a seed orchard source were significantly larger in diameter and volume than those from a wild local source after two growing seasons, but second-year heights were similar for the two seedling types. Initial seedling size was positively correlated with growth rate. West. J. Appl. For. 11(2):00-00.

Clonal variation in pollen-related characteristics of Douglas-fir

1982 ◽  
Vol 12 (2) ◽  
pp. 403-408 ◽  
Author(s):  
W. T. Adams
Keyword(s):  
Genetic Variation ◽  
Pollen Grains ◽  
Seed Orchard ◽  
Douglas Fir ◽  
Clonal Variation ◽  
Pollen Production ◽  
The Mean ◽  
Pollen Cone ◽  
Grain Diameter

The mean number of pollen grains produced per pollen cone (P) ranged from 37 310 to 62 960 ([Formula: see text], SE = 1584) among eight seed-orchard clones of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) and correlated significantly (r = 0.87, p < 0.05) with the mean number of microsporophylls per cone but not significantly with pollen cone length. The number of pollen grains per milligram (G) also differed among clones (range 2323–3112; [Formula: see text], SE = 32) and correlated significantly and negatively (r = −0.86) with grain diameter. Although this study provides evidence for genetic variation in both P and G, the differences were relatively small. Adjusting pollen-cone counts for P would add little, if any, precision to estimates of pollen production in seed-orchard clones. If balanced clonal representation in pollen mixes is desired, equal weights of pollen would probably suffice for most breeding applications.

Evaluation of seed production in a first-generation seed orchard of Chinese pine (Pinus tabuliformis)

2016 ◽  
Vol 27 (5) ◽  
pp. 1003-1008 ◽  
Author(s):  
Huwei Yuan ◽  
Shihui Niu ◽  
Xianqing Zhou ◽  
Qingping Du ◽  
Yue Li ◽  
...  
Keyword(s):  
Seed Production ◽  
First Generation ◽  
Seed Orchard ◽  
Chinese Pine ◽  
Pinus Tabuliformis
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