A comparative study of shoot and root development of interior and coastal Douglas-fir seedlings

Fielder, Peter; Owens, John N.

doi:10.1139/x89-184

Cited by 3 publications

(5 citation statements)

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“…In general this final leader length has been reported to depend on conditions the previous year, when needle (or fascicle) primordia were formed. Drought the previous year reduced primordia numbers and leader length, and high temperatures increased primordia numbers and leader length (e.g., Lassoie, 1982;Junttila, 1986;Fielder and Owens, 1989;cf. Kozlowski, Kramer, and Pallardy, 1991).…”

Section: Discussionmentioning

confidence: 99%

“…Leader and new needle growth on conifer saplings (except C. decurrens) is from buds formed the previous season (Cannell, Thompson, and Lines, 1976;Lanner, 1976;Hallgren and Helms, 1988;Fielder and Owens, 1989;Kozlowski, Kramer, and Pallardy, 1991), and growth of the new leader or ''candle'' was monitored. On fir saplings with lateral branches in well-defined whorls, the mean growth of the two longest lateral branches from the topmost whorl was also monitored.…”

Section: Site Characteristics and Methodsmentioning

confidence: 99%

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Mediterranean climate effects. II. Conifer growth phenology across a Sierra Nevada ecotone

Royce

Barbour

2001

American J of Botany

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Growth and xylem water potential of the lower elevation conifers Pinus jeffreyi and Abies concolor and the higher elevation Pinus monticola and Abies magnifica were monitored in their montane Mediterranean habitat of the southernmost Sierra Nevada mountains of California. Measurements were made across the ecotone between the midmontane and upper montane forests and through light and heavy snowfall years.Radial stem growth, averaging ∼1.5 mm/yr, started 2 wk after snow melt, providing that maximum air temperatures had reached 21°C, and ended when predawn water potentials fell rapidly at the onset of the summer drought. Leader growth started on or after a fixed date, providing that minimum air temperatures were above -4°C for Pinus species or +2.5°C for Abies species. The cue for leader growth was inferred to be photoperiodic. Leader growth ended when either a determinate internode length of ∼1 mm was reached or predawn water potentials fell rapidly. Abies magnifica grew more rapidly than the low-elevation species, but had a shorter growth period; its annual leader growth, as a consequence, was only 35 mm/yr vs. 50 mm/yr for the low-elevation species. Needle growth was similarly determinate in the absence of early drought. This growth phenology contributes to determining species distribution across the ecotone.

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Section: Discussionmentioning

confidence: 99%

Section: Site Characteristics and Methodsmentioning

confidence: 99%

Mediterranean climate effects. II. Conifer growth phenology across a Sierra Nevada ecotone

Royce

Barbour

2001

American J of Botany

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“…At the same time we cannot expect bud set because the association between bud set and reduced mitotic activity is even lower, especially in older trees. In the case of young seedlings, bud scales start to form at the middle of the summer as an indications of growth cessation which may take three months [17]. Meanwhile, shoot enlargement can be continued at time of scale formation which is related to the sub-apical meristem and cell elongation.…”

Section: Local Adaptation In Treesmentioning

confidence: 99%

“…In another example, Douglas-fir starts stem growth as early as February [17] and bud swelling continues through March, but bud flush is not predictable as it may not until end of April or even May. However, mitotic activity is not easy to identify by sight.…”

Section: Adaptation By Scots Pine (Pinus Sylvestris)mentioning

confidence: 99%

Adaptive variation in extent and timing of growth of Scottish Scots pine (Pinus sylvestris Linn)

Govindarajulu¹

2014

J Biodivers Endanger Species

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Local adaptation is a key consideration for forestry related activities, particularly when seed is transferred from one seed zone to another for afforestation. Locally adapted trees may show differences in growth when planted in sites other than their origin. Scots pine is one of the most valuable commercial timber trees with higher rate of growth. Although growth differences have been noted in the past, the extent to which Scottish Scots pines are locally adapted at the population level has remained unclear. In this dissertation, some aspects of local adaptation in pine are discussed and previous work is reviewed (essay review) and then (research paper) an experimental trial is presented in which genetic differences among populations and families from the Scottish Scots pine distribution are tested using growth as a measure of performance. Differences are related to climatic variables from the sites of origin of the seed. Finally, the role of provenance/progeny trials or common garden tests in researching local adaptation is also discussed.

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“…Accordingly, several common garden experiments found intra-specific trait differences among Douglas-fir provenances that were related to growth, physiology, and phenology and which showed associations with differences in source climate among provenance locations (e.g. Anekonda et al 2004; Fielder & Owens 1989; Kleiber et al 2017; Pharis & Ferrel 1966). While such trait-climate associations can indeed suggest patterns of local adaptation due to spatially varying selection (Leinonen et al 2013), their interpretation can still be doubtful, because the climatic clines at which provenances occur often show parallelism with re-colonization routes after population contraction and expansion (Nadeau et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Looking for the needle in a downsized haystack: Whole-exome sequencing unravels how selection and gene flow have shaped climatic adaptation in Douglas-fir (Pseudotsuga menziesii)

George

Schueler

Grabner

et al. 2020

Preprint

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The widespread Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) occurs along a steep gradient of diverse climates throughout its natural range, which is expected to result in spatially varying selection to local climate conditions. However, phenotypic signals of climatic adaptation can often be confounded, because unraveled clines covary with signals caused by neutral evolutionary processes such as gene flow and genetic drift. Here, we present phenotypic and genotypic data from a common garden experiment showing a putative signal of adaptation to climate after trees have been growing for 40 years in a common environment. Sixteen Douglas-fir provenances originating from a North-to-South gradient of approx. 1,000 km were analyzed and genomic information was obtained from exome capture, which resulted in an initial genomic dataset of >90,000 single nucleotide polymorphisms. We used a restrictive and conservative filtering approach which permitted us to include only SNPs and individuals in environmental association analysis (EAA) that were free of potentially confounding effects (LD, relatedness among trees, heterozygosity deficiency and deviations from Hardy-Weinberg proportions). We used four conceptually different genome scan methods based on FST outlier detection and gene-environment association in order to disentangle truly adaptive SNPs from neutral SNPs and found that a relatively small proportion of the exome showed a truely adaptive signal (0.01-0.17%) when population substructuring and multiple testing was accounted for. Nevertheless, the unraveled SNP candidates showed significant relationship with climate at provenance origins which strongly suggests that they have most likely featured adaption in Douglas-fir across a steep climatic gradient. Two SNPs were independently found by three of the employed algorithms and one could be assigned with high probability to a Picea abies homolog gene involved in circadian clock control as was also found in Populus balsamifera.

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A comparative study of shoot and root development of interior and coastal Douglas-fir seedlings

Abstract: not available

Cited by 3 publications

References 0 publications

Mediterranean climate effects. II. Conifer growth phenology across a Sierra Nevada ecotone

Mediterranean climate effects. II. Conifer growth phenology across a Sierra Nevada ecotone

Adaptive variation in extent and timing of growth of Scottish Scots pine (Pinus sylvestris Linn)

Looking for the needle in a downsized haystack: Whole-exome sequencing unravels how selection and gene flow have shaped climatic adaptation in Douglas-fir (Pseudotsuga menziesii)

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