Genetic variation in Pinus strobiformis growth and drought tolerance from southwestern US populations

Betsy A. Goodrich, Kristen M Waring, Thomas E Kolb

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The persistence of some tree species is threatened by combinations of novel abiotic and biotic stressors. To examine the hypothesis that Pinus strobiformis Engelm., a tree threatened by an invasive forest pathogen and a changing climate, exhibits intraspecific genetic variation in adaptive traits, we conducted a common garden study of seedlings at one location with two watering regimes using 24 populations. Four key findings emerged: (i) growth and physiological traits were low to moderately differentiated among populations but differentiation was high for some traits in water-stressed populations; (ii) seedlings from warmer climates grew larger, had higher stomatal density and were more water-use efficient (as measured by the carbon isotope ratio) than populations from colder climates; (iii) seedlings from the northern edge of the species' distribution had lower water-use efficiency, higher stomatal conductance, slower growth and longer survival in a lethal drought experiment compared with seedlings from more southern populations; and (iv) based on non-metric multidimensional scaling analyses, populations clustered into southern and northern groups, which did not correspond to current seed transfer zones. Our discovery of a clinal geographic pattern of genetic variation in adaptive traits of P. strobiformis seedlings will be useful in developing strategies to maintain the species during ongoing climate change and in the face of an invasive pathogen.

Original languageEnglish (US)
Pages (from-to)1219-1235
Number of pages17
JournalTree Physiology
Volume36
Issue number10
DOIs
StatePublished - Oct 1 2016

Fingerprint

Pinus
Droughts
drought tolerance
Seedlings
genetic variation
Growth
seedlings
Population
Climate
Water
climate change
Carbon Isotopes
Cold Climate
Endangered Species
pathogens
Climate Change
cold zones
water use efficiency
gardens
stomatal conductance

Keywords

  • Adaptive Traits
  • Carbon Isotope Ratio
  • Five-Needle Pine
  • Southwestern White Pine

ASJC Scopus subject areas

  • Medicine(all)
  • Physiology
  • Plant Science

Cite this

Genetic variation in Pinus strobiformis growth and drought tolerance from southwestern US populations. / Goodrich, Betsy A.; Waring, Kristen M; Kolb, Thomas E.

In: Tree Physiology, Vol. 36, No. 10, 01.10.2016, p. 1219-1235.

Research output: Contribution to journalArticle

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