Physiological and Genetic Approaches to Studying Endodormancy-related Traits in Populus

Howe, Glenn T.; Davis, Joel; Jeknić, Zoran; Chen, Tony H. H.; Frewen, Barbara; Bradshaw, H. D.; Saruul, Purev

doi:10.21273/hortsci.34.7.1174b

Cited by 45 publications

(35 citation statements)

References 88 publications

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“…We observed latitudinal variation in cold hardiness in both plains cottonwood and saltcedar. This variation was expected for the native cottonwood, which is known to exhibit inherited latitudinal variation in the timing of growth cessation (Pauley and Perry 1954; Kaszkurewicz and Fogg 1967; Howe et al. 1995, 1999; Dunlap and Stettler 1996), but not for saltcedar, a woody species that has been present in North America for only about 150 years (Robinson 1965).…”

Section: Discussionmentioning

confidence: 86%

Latitudinal variation in cold hardiness in introduced Tamarix and native Populus

Friedman

Roelle

Gaskin

et al. 2008

Evolutionary Applications

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To investigate the evolution of clinal variation in an invasive plant, we compared cold hardiness in the introduced saltcedar (Tamarix ramosissima, Tamarix chinensis, and hybrids) and the native plains cottonwood (Populus deltoides subsp. monilifera). In a shadehouse in Colorado (41°N), we grew plants collected along a latitudinal gradient in the central United States (29–48°N). On 17 occasions between September 2005 and June 2006, we determined killing temperatures using freeze-induced electrolyte leakage and direct observation. In midwinter, cottonwood survived cooling to −70°C, while saltcedar was killed at −33 to −47°C. Frost sensitivity, therefore, may limit northward expansion of saltcedar in North America. Both species demonstrated inherited latitudinal variation in cold hardiness. For example, from September through January killing temperatures for saltcedar from 29.18°N were 5–21°C higher than those for saltcedar from 47.60°N, and on September 26 and October 11, killing temperatures for cottonwood from 33.06°N were >43°C higher than those for cottonwood from 47.60°N. Analysis of nine microsatellite loci showed that southern saltcedars are more closely related to T. chinensis while northern plants are more closely related to T. ramosissima. Hybridization may have introduced the genetic variability necessary for rapid evolution of the cline in saltcedar cold hardiness.

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Section: Discussionmentioning

confidence: 86%

Latitudinal variation in cold hardiness in introduced Tamarix and native Populus

Friedman

Roelle

Gaskin

et al. 2008

Evolutionary Applications

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“…Temperature, moisture, and photoperiod also act as important environmental signals that help trees acclimate to adverse conditions (Howe et al 1999. Short days and low night temperatures promote bud set, cold acclimation, and winter dormancy in the fall.…”

Section: Silvical Characteristicsmentioning

confidence: 99%

“…The timing of bud flush is affected by chilling and flushing requirements (Howe et al 1999;. High chilling requirements help prevent mid-winter bud flush and cold injury in climates with winter temperatures that fluctuate above and below freezing.…”

Section: Genecologymentioning

confidence: 99%

Breeding Douglas‐Fir

Howe

Jayawickrama

Cherry

et al. 2005

Plant Breeding Reviews

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“…In order to provide insights into these questions, we investigated the ecological genomics of bud-break in black cottonwood (Populus trichocarpa), a species used extensively to investigate heritable adaptive traits in woody plants (Bradshaw & Stettler, 1995;Howe et al, 1999;Frewen et al, 2000;Evans et al, 2014;McKown et al, 2014b). Poplars (Populus spp.)…”

Section: Introductionmentioning

confidence: 99%

Ecological genomics of variation in bud‐break phenology and mechanisms of response to climate warming in Populus trichocarpa

et al. 2018

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Spring bud-break phenology is a critical adaptive feature common to temperate perennial woody plants. Understanding the molecular underpinnings of variation in bud-break is important for elucidating adaptive evolution and predicting outcomes relating to climate change. Field and controlled growth chamber tests were used to assess population-wide patterns in bud-break from wild-sourced black cottonwood (Populus trichocarpa) genotypes. We conducted a genome-wide association study (GWAS) with single nucleotide polymorphisms (SNPs) derived from whole genome sequencing to test for loci underlying variation in bud-break. Bud-break had a quadratic relationship with latitude, where southern- and northern-most provenances generally broke bud earlier than those from central parts of the species' range. Reduced winter chilling increased population-wide variation in bud-break, whereas greater chilling decreased variation. GWAS uncovered 16 loci associated with bud-break. Phenotypic changes connected with allelic variation were replicated in an independent set of P. trichocarpa trees. Despite phenotypic similarities, genetic profiles between southern- and northern-most genotypes were dissimilar based on our GWAS-identified SNPs. We propose that the GWAS-identified loci underpin the geographical pattern in P. trichocarpa and that variation in bud-break reflects different selection for winter chilling and heat sum accumulation, both of which can be affected by climate warming.

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Physiological and Genetic Approaches to Studying Endodormancy-related Traits in Populus

Cited by 45 publications

References 88 publications

Latitudinal variation in cold hardiness in introduced Tamarix and native Populus

Latitudinal variation in cold hardiness in introduced Tamarix and native Populus

Breeding Douglas‐Fir

Ecological genomics of variation in bud‐break phenology and mechanisms of response to climate warming in Populus trichocarpa

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