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Acclimation of respiratory temperature responses in northern and southern populations of Pinus banksiana
Author(s) -
Tjoelker M. G.,
Oleksyn J.,
LorencPlucinska G.,
Reich P. B.
Publication year - 2009
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2008.02624.x
Subject(s) - acclimatization , respiration , biology , population , botany , ecology , sociology , demography
Summary• Temperature acclimation of respiration may contribute to climatic adaptation and thus differ among populations from contrasting climates. • Short‐term temperature responses of foliar dark respiration were measured in 33‐yr‐old trees of jack pine ( Pinus banksiana ) in eight populations of wide‐ranging origin (44–55°N) grown in a common garden at 46.7°N. It was tested whether seasonal adjustments in respiration and population differences in this regard resulted from changes in base respiration rate at 5°C ( R 5 ) or Q 10 (temperature sensitivity) and covaried with nitrogen and soluble sugars. • In all populations, acclimation was manifest primarily through shifts in R 5 rather than altered Q 10 . R 5 was higher in cooler periods in late autumn and winter and lower in spring and summer, inversely tracking variation in ambient air temperature. Overall, R 5 covaried with sugars and not with nitrogen. Although acclimation was comparable among all populations, the observed seasonal ranges in R 5 and Q 10 were greater in populations originating from warmer than from colder sites. Population differences in respiratory traits appeared associated with autumnal cold hardening. • Common patterns of respiratory temperature acclimation among biogeographically diverse populations provide a basis for predicting respiratory carbon fluxes in a wide‐ranging species.