Trees of the people: the growing science of poplars in Canada and worldwideThis commentary is one of a selection of papers published in the Special Issue on Poplar Research in Canada.

Cooke, Janice E. K.; Rood, Stewart B.

doi:10.1139/b07-125

Cited by 32 publications

(7 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fremont cottonwood (P. fremontii, S. Watson) is increasingly abundant with distance from the coast and becomes the dominant tree species in the warmer, interior portion of the catchment. This pattern matches the distributions of these species throughout North America, with P. trichocarpa found in wetter and more temperate regions and P. fremontii in more arid landscapes (Braatne et al, 1996;Cooke & Rood, 2007).…”

Section: Site and Species Descriptionsupporting

confidence: 75%

See 1 more Smart Citation

Seasonal and Species‐Level Water‐Use Strategies and Groundwater Dependence in Dryland Riparian Woodlands During Extreme Drought

Williams,

Stella,

Singer

et al. 2024

Water Resources Research

View full text Add to dashboard Cite

Drought‐induced groundwater decline and warming associated with climate change are primary threats to dryland riparian woodlands. We used the extreme 2012–2019 drought in southern California as a natural experiment to assess how differences in water‐use strategies and groundwater dependence may influence the drought susceptibility of dryland riparian tree species with overlapping distributions. We analyzed tree‐ring stable carbon and oxygen isotopes collected from two cottonwood species (Populus trichocarpa and P. fremontii) along the semi‐arid Santa Clara River. We also modeled tree source water δ18O composition to compare with observed source water δ18O within the floodplain to infer patterns of groundwater reliance. Our results suggest that both species functioned as facultative phreatophytes that used shallow soil moisture when available but ultimately relied on groundwater to maintain physiological function during drought. We also observed apparent species differences in water‐use strategies and groundwater dependence related to their regional distributions. P. fremontii was constrained to more arid river segments and ostensibly used a greater proportion of groundwater to satisfy higher evaporative demand. P. fremontii maintained ∆13C at pre‐drought levels up until the peak of the drought, when trees experienced a precipitous decline in ∆13C. This response pattern suggests that trees prioritized maintaining photosynthetic processes over hydraulic safety, until a critical point. In contrast, P. trichocarpa showed a more gradual and sustained reduction in ∆13C, indicating that drought conditions induced stomatal closure and higher water use efficiency. This strategy may confer drought avoidance for P. trichocarpa while increasing its susceptibility to anticipated climate warming.

show abstract

Section: Site and Species Descriptionsupporting

confidence: 75%

“…trichocarpa found in wetter and more temperate regions and P . fremontii in more arid landscapes (Braatne et al., 1996; Cooke & Rood, 2007).…”

Section: Methodsmentioning

confidence: 99%

Seasonal and Species‐Level Water‐Use Strategies and Groundwater Dependence in Dryland Riparian Woodlands During Extreme Drought

Williams,

Stella,

Singer

et al. 2024

Water Resources Research

View full text Add to dashboard Cite

show abstract

“…Populus angustifolia James is a dominant riparian tree species distributed from the south of Alberta, Canada along the U.S. Rocky Mountains and into the north of Chihuahua, Mexico 49 spanning approximately 1700 km of latitude. The species exhibits a wide range of physiological, growth, and phenological trait variation across this large geographic range and gradient of climates 35 and is thus ideal for examining how genetic variation for functional traits are distributed on the landscape and may shift in response to climate change.…”

Section: Methodsmentioning

confidence: 99%

Stacked distribution models predict climate-driven loss of variation in leaf phenology at continental scales

Bayliss

Mueller

Ware³

et al. 2022

Commun Biol

View full text Add to dashboard Cite

Climate change is having profound effects on species distributions and is likely altering the distribution of genetic variation across landscapes. Maintaining population genetic diversity is essential for the survival of species facing rapid environmental change, and variation loss will further ecological and evolutionary change. We used trait values of spring foliar leaf-out phenology of 400 genotypes from three geographically isolated populations of Populus angustifolia grown under common conditions, in concert with stacked species distribution modeling, to ask: (a) How will climate change alter phenological variation across the P. angustifolia species-range, and within populations; and (b) will the distribution of phenological variation among and within populations converge (become more similar) in future climatic conditions? Models predicted a net loss of phenological variation in future climate scenarios on 20-25% of the landscape across the species’ range, with the trailing edge population losing variation on as much as 47% of the landscape. Our models also predicted that population’s phenological trait distributions will become more similar over time. This stacked distribution model approach allows for the identification of areas expected to experience the greatest loss of genetically based functional trait variation and areas that may be priorities to conserve as future genetic climate refugia.

show abstract

“…Here, we evaluated whether seasonality or longer-term changes in microbial community composition drive temporal dynamics of the Populus microbiome. The tree genus Populus includes numerous widespread and ecologically important riparian and early-successional species ( 43 ), which are potentially valuable biofuel feedstocks ( 44 ) and ideal model trees for the study of plant-microbe interactions due to their experimental tractability and well-characterized genetics ( 27 ). We grew 10 genotypes of two Populus spp.…”

Section: Introductionmentioning

confidence: 99%

Seasonality and longer-term development generate temporal dynamics in the Populus microbiome

Argiroff,

Carrell,

Klingeman

et al. 2024

mSystems

View full text Add to dashboard Cite

Temporal variation in community composition is central to our understanding of the assembly and functioning of microbial communities, yet the controls over temporal dynamics for microbiomes of long-lived plants, such as trees, remain unclear. Temporal variation in tree microbiomes could arise primarily from seasonal (i.e., intra-annual) fluctuations in community composition or from longer-term changes across years as host plants age. To test these alternatives, we experimentally isolated temporal variation in plant microbiome composition using a common garden and clonally propagated plants, and we used amplicon sequencing to characterize bacterial/archaeal and fungal communities in the leaf endosphere, root endosphere, and rhizosphere of two Populus spp. over four seasons across two consecutive years. Microbial community composition differed among seasons and years (which accounted for up to 21% of the variation in microbial community composition) and was correlated with seasonal dissimilarity in climatic conditions. However, microbial community dissimilarity was also positively correlated with time, reflecting longer-term compositional shifts as host trees aged. Together, our findings demonstrate that temporal patterns in tree microbiomes arise from both seasonal fluctuations and longer-term changes, which interact to generate unique seasonal patterns each year. In addition to shedding light on two important controls over the assembly of plant microbiomes, our results also suggest future studies of tree microbiomes should account for background temporal dynamics when testing the drivers of spatial patterns in microbial community composition and temporal responses of plant microbiomes to environmental change. IMPORTANCE Microbiomes are integral to the health of host plants, but we have a limited understanding of the factors that control how the composition of plant microbiomes changes over time. Especially little is known about the microbiome of long-lived trees, relative to annual and non-woody plants. We tested how tree microbiomes changed between seasons and years in poplar (genus Populus ), which are widespread and ecologically important tree species that also serve as important biofuel feedstocks. We found the composition of bacterial, archaeal, and fungal communities differed among seasons, but these seasonal differences depended on year. This dependence was driven by longer-term changes in microbial composition as host trees developed across consecutive years. Our findings suggest that temporal variation in tree microbiomes is driven by both seasonal fluctuations and longer-term (i.e., multiyear) development.

show abstract

Trees of the people: the growing science of poplars in Canada and worldwideThis commentary is one of a selection of papers published in the Special Issue on Poplar Research in Canada.

Cited by 32 publications

References 24 publications

Seasonal and Species‐Level Water‐Use Strategies and Groundwater Dependence in Dryland Riparian Woodlands During Extreme Drought

Seasonal and Species‐Level Water‐Use Strategies and Groundwater Dependence in Dryland Riparian Woodlands During Extreme Drought

Stacked distribution models predict climate-driven loss of variation in leaf phenology at continental scales

Seasonality and longer-term development generate temporal dynamics in the Populus microbiome

Contact Info

Product

Resources

About