Skip to Main Content
Conflicting functional effects of xylem pit structure relate to the growth-longevity trade-off in a conifer speciesAuthor(s): Beth Roskilly; Eric Keeling; Sharon Hood; Arnaud Giuggiola; Anna Sala
Source: PNAS. doi: /10.1073/pnas.1900734116.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
Download Publication (1.0 MB)
DescriptionConsistent with a ubiquitous life history trade-off, trees exhibit a negative relationship between growth and longevity both among and within species. However, the mechanistic basis of this life history trade-off is not well understood. In addition to resource allocation conflicts among multiple traits, functional conflicts arising from individual morphological traits may also contribute to life history trade-offs. We hypothesized that conflicting functional effects of xylem structural traits contribute to the growth-longevity trade-off in trees. We tested this hypothesis by examining the extent to which xylem morphological traits (i.e., wood density, tracheid diameters, and pit structure) relate to growth rates and longevity in two natural populations of the conifer species Pinus ponderosa. Hydraulic constraints arise as trees grow larger and xylem anatomical traits adjust to compensate. We disentangled the effects of size through ontogeny in individual trees and growth rates among trees on xylem traits by sampling each tree atmultiple trunk diameters. We found that the oldest trees had slower lifetime growth rates compared with younger trees in the studied populations, indicating a growth-longevity trade-off.We further provide evidence that a single xylem trait, pit structure, with conflicting effects on xylem function (hydraulic safety and efficiency) relates to the growth-longevity trade-off in a conifer species. This study highlights that, in addition to trade-offs among multiple traits, functional constraints based on individual morphological traits like that of pit structure provide mechanistic insight into how and when life history trade-offs arise.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationRoskilly, Beth; Keeling, Eric; Hood, Sharon; Giuggiola, Arnaud; Sala, Anna. 2019. Conflicting functional effects of xylem pit structure relate to the growth-longevity trade-off in a conifer species. PNAS. doi: /10.1073/pnas.1900734116.
Keywordslife history, plant hydraulics, xylem anatomy, growth-longevity trade-off, pit structure
- Growth and longevity in freshwater mussels: evolutionary and conservation implications
- Expression of functional traits during seedling establishment in two populations of Pinus ponderosa from contrasting climates
- Divergence in strategies for coping with winter embolism among co-occurring temperate tree species: the role of positive xylem pressure, wood type and tree stature
XML: View XML