Thermal acclimation of leaf and root respiration: an investigation comparing inherently fast‐ and slow‐growing plant species

作者：B. R. Loveys, Lindsey Atkinson, David Sherlock, R L Roberts, Alastair Fitter, Owen K. Atkin · 发表于：Global Change Biology · 年份：2003 · DOI：10.1046/j.1365-2486.2003.00611.x · 被引用次数：286 · 研究领域：Plant Water Relations and Carbon Dynamics、Plant responses to elevated CO2、Plant Stress Responses and Tolerance

Abstract We investigated the extent to which leaf and root respiration ( R ) differ in their response to short‐ and long‐term changes in temperature in several contrasting plant species (herbs, grasses, shrubs and trees) that differ in inherent relative growth rate (RGR, increase in mass per unit starting mass and time). Two experiments were conducted using hydroponically grown plants. In the long‐term (LT) acclimation experiment, 16 species were grown at constant 18, 23 and 28 °C. In the short‐term (ST) acclimation experiment, 9 of those species were grown at 25/20 °C (day/night) and then shifted to a 15/10 °C for 7 days. Short‐term Q 10 values (proportional change in R per 10 °C) and the degree of acclimation to longer‐term changes in temperature were compared. The effect of growth temperature on root and leaf soluble sugar and nitrogen concentrations was examined. Light‐saturated photosynthesis (A sat ) was also measured in the LT acclimation experiment. Our results show that Q 10 values and the degree of acclimation are highly variable amongst species and that roots exhibit lower Q 10 values than leaves over the 15–25 °C measurement temperature range. Differences in RGR or concentrations of soluble sugars/nitrogen could not account for the inter‐specific differences in the Q 10 or degree of acclimation. There were no systematic differences in the ability of roots and leaves to acclimate when plants developed under contrasting temperatures (LT acclimation). However, acclim...