Ecological adaptations in Douglas-fir (Pseudotsugamenziesii var. glauca) populations. III. Central Idaho

1983 ◽  
Vol 13 (4) ◽  
pp. 626-632 ◽  
Author(s):  
Gerald E. Rehfeldt
Keyword(s):  
Cold Hardiness ◽  
High Growth ◽  
Frost Damage ◽  
Douglas Fir ◽  
Growth Potential ◽  
Bud Burst ◽  
Population Means ◽  
Spring Frost ◽  
Selection For ◽  
Central Idaho

Growth, phenology, and cold hardiness of seedlings from 74 populations of Douglas-fir (Pseudotsugamenziesii var. glauca (Beissn.) Franco) from central Idaho were compared in four contrasting environments. Analyses of 3-year-old seedlings revealed population differentiation for eight variables: bud burst, bud set, multiple flushing, height, deviation from regression of 3-year height on 2-year height, spring frost damage, fall frost damage, and winter injury. These analyses, as well as high intercorrelations among population means, suggested that adaptations result from a balance between selection for a high growth potential in mild environments and selection for cold hardiness in severe environments. Consequently, genetic variation among populations was closely related to the elevation, geography, and climate of the seed source.

Genetic variation in fall cold hardiness in coastal Douglas-fir in western Oregon and Washington

2006 ◽  
Vol 84 (7) ◽  
pp. 1110-1121 ◽  
Author(s):  
J. Bradley St. Clair
Keyword(s):  
Genetic Variation ◽  
Cold Hardiness ◽  
Environmental Gradients ◽  
Large Population ◽  
Common Garden ◽  
Cold Season ◽  
Douglas Fir ◽  
Bud Burst ◽  
Population Differences ◽  
Bud Set

Genetic variation in fall cold damage in coastal Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco var. menziesii ) was measured by exposing excised branches of seedlings from 666 source locations grown in a common garden to freezing temperatures in a programmable freezer. Considerable variation was found among populations in fall cold hardiness of stems, needles, and buds compared with bud burst, bud set, and biomass growth after 2 years. Variation in fall cold hardiness was strongly correlated (r = 0.67) with cold-season temperatures of the source environment. Large population differences corresponding with environmental gradients are evidence that natural selection has been important in determining genetic variation in fall cold hardiness, much more so than in traits of bud burst (a surrogate for spring cold hardiness), bud set, and growth. Seed movement guidelines and breeding zones may be more restrictive when considering genetic variation in fall cold hardiness compared with growth, phenology, or spring cold hardiness. A regional stratification system based on ecoregions with latitudinal and elevational divisions, and roughly corresponding with breeding zones used in Oregon and Washington, appeared to be adequate for minimizing population differences within regions for growth and phenology, but perhaps not fall cold hardiness. Although cold hardiness varied among populations, within-population and within-region variation is sufficiently large that responses to natural or artificial selection may be readily achieved.

Growth, phenology, and cold hardiness of 32 Douglas-fir full-sib families

2009 ◽  
Vol 39 (10) ◽  
pp. 1821-1834 ◽  
Author(s):  
B. J. Hawkins ◽  
M. Stoehr
Keyword(s):  
Cold Hardiness ◽  
Shoot Growth ◽  
Final Height ◽  
Leaf Nitrogen ◽  
Douglas Fir ◽  
Bud Burst ◽  
Freezing Damage ◽  
Family Selection ◽  
Growing Period ◽  
Sib Families

Thirty-two full-sib families of coastal Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco var. menziesii) with a range of predicted breeding values were monitored for growth rate, phenology, and cold hardiness over 2 years on two sites to investigate if other traits are being selected when family selection is based on height. Significant differences among families existed in most phenological, growth, and cold-hardiness traits. On average, taller families burst bud later but did not have significantly different growth rates or length of growing period than other families. We found no significant correlations between family date of bud burst and cold hardiness in late spring or between duration of shoot growth or height and autumn freezing damage. Family differences in freezing tolerance were greatest in September and October. In these months, family current-year leaf nitrogen was positively correlated with cold hardiness. Families that were most hardy in the autumn were not the most hardy families in spring. We conclude that, for the studied breeding series, selection based on height does not have a significant impact on cold hardiness. We found no consistent relationships between phenological, growth, or cold-hardiness parameters and final height that could explain family ranking by height. Relationships between grandparent elevation and dates of bud burst and cold hardiness were observed.

Morphological acclimation to light intensity in Douglas-fir seedlings

1977 ◽  
Vol 55 (15) ◽  
pp. 2033-2042 ◽  
Author(s):  
Allan P. Drew ◽  
William K. Ferrell
Keyword(s):  
Light Intensity ◽  
Root Growth ◽  
Dry Weight ◽  
Frost Damage ◽  
Douglas Fir ◽  
Stem Length ◽  
Low Light ◽  
Spring Frost ◽  
Terminal Bud ◽  
Leaf Surface Area

Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were grown outdoors under 9, 44, and 100% light intensity and were sampled periodically over their first growing season for stem, leaf, and root dry weights, and the data were analyzed allometrically. In addition, seedlings were assessed for number of needles per stem length, ratio leaf surface area: leaf dry weight, and maximum seedling dry weight. The experiment was repeated during a 2nd, warmer, year.Maximum growth occurred under partial shade and moderate temperatures. In the 1st year, seedlings allocated progressively more dry matter to shoot than to root growth as light intensity decreased. In the 2nd year, root growth was favored at the expense of shoot growth. In both years, shoot structural alterations were such as to favor enhanced photosynthesis under low light. Acclimative changes are explained in terms of an interaction between light, temperature, and seedling size.A second experiment showed that seedlings grown under low light set a terminal bud sooner in the fall and broke bud sooner the next spring than seedlings preconditioned to high light. They also suffered more spring frost damage and showed greater incidence of lammas growth in the 2nd year. No effect of 1st-year preconditioning on timing of budbreak was evident in the 3rd year.

Genetic control of bud phenology in pole-size trees and seedlings of coastal Douglas-fir

1993 ◽  
Vol 23 (6) ◽  
pp. 1043-1051 ◽  
Author(s):  
Peng Li ◽  
W.T. Adams
Keyword(s):  
Genetic Control ◽  
Growth Traits ◽  
Douglas Fir ◽  
Bud Burst ◽  
Age Classes ◽  
Breeding Programs ◽  
Bud Set ◽  
Bud Phenology ◽  
Selection For ◽  
Lateral Branches

The extent to which bud phenology is genetically controlled and related to growth traits was examined in seedlings and pole-size trees of coastal Douglas-fir (Pseudotsugamenziesii var. menziesii (Mirb.) Franco). Data on bud burst, bud set, and stem growth were collected from pole-size trees of 60 open-pollinated families growing in four plantations, and from seedlings of 45 of these same families growing in three trials. In both age-classes, bud burst was under moderate to strong genetic control (h2 ≥ 0.44) and family breeding values were stable across test environments, indicating that this trait could be readily altered in breeding programs. Bud set was inherited strongly in pole-size trees (h2 = 0.81) but weakly in seedlings (h2 < 0.30). Both bud burst and bud set were positively correlated with growth in seedlings and pole-size trees. Thus, selection for greater growth at either age-class is expected to delay bud burst and bud set. We also evaluated the accuracy of two alternatives for assessing bud burst phenology in pole-size trees compared with the traditional method. We show that bud-burst date on lateral branches can be used to accurately rank both individuals and families for bud-burst date on less accessible leader shoots. In addition, we found that families can be ranked for mean bud-burst date by the proportion of trees per family that have flushed on a given scoring day. This method is only effective, however, when between 25 and 75% of all trees in the test have flushed at the time of scoring.

Genetic variation at early ages for several traits of interest for timber-production breeding of Juglans regia

2005 ◽  
Vol 35 (2) ◽  
pp. 235-243 ◽  
Author(s):  
R Díaz ◽  
J Fernández-López
Keyword(s):  
Phytophthora Cinnamomi ◽  
Juglans Regia ◽  
Frost Damage ◽  
Late Spring ◽  
Bud Burst ◽  
Stem Form ◽  
Spring Frost ◽  
Growing Seasons ◽  
Apical Bud ◽  
Late Spring Frost

Several traits of common walnut (Juglans regia L.) were assessed during the first three growing seasons in a progeny test of 43 open-pollinated families at two sites in northwestern Spain. Variance components, heritabilities and correlations between traits were calculated for all characteristics measured. Significant differences were found among families with regard to growth, phenology, frost damage, number of apical branches, and Phytophthora cinnamomi Rands damage, but not for growth-habit traits (number of branches, stem form, and apical dominance). Heritabilities were moderate for total height (h2i ≥ 0.32; h2f ≥ 0.63) and late-spring frost damage (h2i = 0.29; h2f = 0.57), high for resistance to P. cinnamomi (h2i = 0.76; h2f = 0.85), and low for phenology (h2i = 0.15; h2f = 0.39 for bud burst, and h2i = 0.14–0.36; h2f= 0.44–0.70 for leaf fall) and root-collar diameter (h2i = 0.18–0.29; h2f = 0.41–0.58). High age–age correlations were found for growth and phenology traits during the first three growing seasons. Some interesting correlations were also found between several of the traits studied. The families whose buds burst the earliest had more late-spring frost damage and, consequently, more apical branches (i.e., branches near the apical bud). Furthermore, the greater the resistance to P. cinnamomi and frost damage, the taller the families.

scholarly journals Cold Hardiness Dynamics and Spring Phenology: Climate-Driven Changes and New Molecular Insights Into Grapevine Adaptive Potential

2021 ◽  
Vol 12 ◽  
Author(s):  
Valeria De Rosa ◽  
Giannina Vizzotto ◽  
Rachele Falchi
Keyword(s):  
Climate Change ◽  
Cold Hardiness ◽  
Frost Damage ◽  
The Other ◽  
Adaptive Potential ◽  
Spring Phenology ◽  
Large Variability ◽  
Spring Frost ◽  
Bud Phenology ◽  
Geographical Locations

Climate change has become a topic of increasing significance in viticulture, severely challenged by this issue. Average global temperatures are increasing, but frost events, with a large variability depending on geographical locations, have been predicted to be a potential risk for grapevine cultivation. Grape cold hardiness encompasses both midwinter and spring frost hardiness, whereas the avoidance of spring frost damage due to late budbreak is crucial in cold resilience. Cold hardiness kinetics and budbreak phenology are closely related and affected by bud’s dormancy state. On the other hand, budbreak progress is also affected by temperatures during both winter and spring. Genetic control of bud phenology in grapevine is still largely undiscovered, but several studies have recently aimed at identifying the molecular drivers of cold hardiness loss and the mechanisms that control deacclimation and budbreak. A review of these related traits and their variability in different genotypes is proposed, possibly contributing to develop the sustainability of grapevine production as climate-related challenges rise.

Ecological genetics of Pinuscontorta in the Wasatch and Uinta Mountains of Utah

1985 ◽  
Vol 15 (3) ◽  
pp. 524-530 ◽  
Author(s):  
G. E. Rehfeldt
Keyword(s):  
Regression Models ◽  
Laboratory Tests ◽  
Cold Hardiness ◽  
Geographic Location ◽  
Shoot Elongation ◽  
Ecological Genetics ◽  
Growth Potential ◽  
Uinta Mountains ◽  
Population Means ◽  
Seed Transfer

Genetic differentiation of 45 populations of Pinuscontorta primarily from the Wasatch and Uinta Mountains was studied in field, greenhouse, and laboratory tests. Analyses of variables reflecting growth potential, morphology, cold hardiness, and periodicity of shoot elongation revealed population differentiation for a variety of traits. Regression models related as much as 77% of the variance among population means to the elevation and geographic location of the seed source. For genetic variation to be arranged along relatively steep environmental clines implies pronounced adaptive differentiation. As a result, seed transfer in reforestation should be restricted severely if maladaptation is to be controlled.

scholarly journals Effects of elevated CO2 and temperature on cold hardiness and spring bud burst and growth in Douglas-fir (Pseudotsuga menziesii)

1998 ◽  
Vol 18 (10) ◽  
pp. 671-679 ◽  
Author(s):  
S. Guak ◽  
D. M. Olsyzk ◽  
L. H. Fuchigami ◽  
D. T. Tingey
Keyword(s):  
Elevated Co2 ◽  
Pseudotsuga Menziesii ◽  
Cold Hardiness ◽  
Douglas Fir ◽  
Bud Burst ◽  
Elevated Co2 And Temperature

Interactive effects of selection for growth and protein supply on the consequences of gastrointestinal parasitism on growth performance in mice

2007 ◽  
Vol 2007 ◽  
pp. 92-92 ◽  
Author(s):  
J.G.M. Houdijk ◽  
L. Bünger
Keyword(s):  
Genetic Resistance ◽  
High Growth ◽  
Growth Potential ◽  
Interactive Effects ◽  
Farm Animals ◽  
Production Potential ◽  
High Production ◽  
Gastrointestinal Parasitism ◽  
Selection For ◽  
Protein Supply

The consequence of sub-clinical gastrointestinal parasitism in farm animals, i.e. reduced food intake and growth, is often more pronounced in breeds with a high production potential compared with breeds with a low one (Houdijk et al., 2001). It cannot be excluded that such differences in disease resistance may arise from between-breed differences in genetic resistance to parasites rather than production potential per se, as within-breed selected farm animals with sufficiently different production potentials are not readily available. However, appropriately selected mouse lines are available (Bünger et al., 2001) to explore the hypothesis that selection for growth may reduce the animal’s capacity to cope with pathogens. We have recently shown in mice divergently selected for growth potential that in some lines, the absolute penalty of sub-clinical parasitism on high growth mice was higher than in their low growth counterparts (Houdijk and Bünger, 2006). Here, we test the hypothesis that this penalty on growth in one of these lines can be reduced through increased protein supply.

scholarly journals Fall Fertilization with N and K: Effects on Douglas-Fir Seedling Quality and Performance

2001 ◽  
Vol 16 (2) ◽  
pp. 71-79 ◽  
Author(s):  
Todd M. Birchler ◽  
Robin Rose ◽  
Diane L. Haase
Keyword(s):  
Pseudotsuga Menziesii ◽  
Cold Hardiness ◽  
Dry Weight ◽  
Growing Season ◽  
Douglas Fir ◽  
Growth Potential ◽  
Root Growth Potential ◽  
And Performance ◽  
Kjeldahl Nitrogen ◽  
Chloride Concentrations

Abstract Coastal Douglas-fir (Pseudotsuga menziesii) 1+1 seedlings were fertilized with two fertilizers [NH4NO3+K2SO4 and (NH4)2SO4+KCl] at four rates (0, 80, 160, 320 kg N and K/ha) split over three application dates (September 19, October 13, November 1, 1996). Fertilizer type did not affect total Kjeldahl nitrogen (TKN) levels on any of the sampling dates. By January 10, TKN concentrations had increased 16, 30, and 34%, and chloride concentrations had increased 57, 77, and 112% relative to the unfertilized seedlings for the 80, 160, and 320 kg N+K/ha treatments, respectively. Nitrate levels increased briefly after the first application of NH4NO3+K2SO4. Potassium levels remained relatively unchanged. Levels of most other nutrients, as well as foliar dry weight, increased between September 16 and January 10, but these increases were generally unrelated to the fertilizer treatments. Root growth potential and cold hardiness did not differ among treatments. Seedlings that received 160 or 320 kg N/ha broke bud an average of 3 days earlier than did the unfertilized seedlings. Chlorophyll fluorescence (Fv/Fm) of fertilized seedlings was consistently higher than that of unfertilized seedlings on November 13 and December 30. These treatment differences were not reflected in seedling outplanting performance after one growing season. West. J. Appl. For. 16(2):71–79.

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