Cytochrome and alternative pathway respiration in white spruce (Picea glauca) roots. Effects of growth and measurement temperature

Abstract

Interactions between growth temperature and measurement temperature were examined for their effects on white spruce [Picea glauca (Moench) Voss] root respiration. Total dark respiration rates increased with measurement temperature and were unaffected by growth temperature. Partitioning of respiratory electron flow between the cytochrome and alternative pathways was also unaffected by growth temperature. The proportion of respiration mediated by the alternative pathway was constant at measurement temperatures between 4°C and 18°C, but was increased at higher temperatures. Changes in alternative pathway activity were paralleled by changes in capacity, and the alternative pathway was almost fully engaged at all temperatures. Roots grown at low temperature displayed higher carbohydrate levels than roots grown at higher temperatures, but respiration rate was unaffected. Spruce root respiration did not appear to acclimate to growth temperature, and the alternative pathway was not preferentially engaged at low temperature.

Impact of temperature on the relationship between respiration and nitrogen concentration in roots: an analysis of scaling relationships, Q10 values and thermal acclimation ratios

“…Variability in the degree of thermal acclimation of root R is common (Atkin et al, 2005). For example, both Burton et al (2002) and Weger & Guy (1991) found no evidence of acclimation in roots of woody species, whereas acclimation of root R has been observed in saplings or young trees grown at constant elevated temperatures (Bryla et al, 1997;Tjoelker et al, 1999) or at elevated field temperatures (Bryla et al, 2001). Similarly, the degree of acclimation of root R was highly variable amongst 16 species in the study by Loveys et al (2003).…”

Carbon use in root respiration as affected by elevated atmospheric O2

“…Root respiration increases as a function of temperature, with the degree of increase being dependent on the temperature coefficient of respiration. Acclimation of root respiration to temperature occurs in Plantago lanceolata (Smakman and Hofstra, 1982) and Zostera marina (Zimmerman et al, 1989), but not in Helianthus annuus (Szaniawski and Kielkiewicz, 1982), Picea glauca (Weger and Guy, 1991), Picea engelmannii and Abies lasiocarpa (Sowell and Spomer, 1986). Acclimation of respiration to the growth temperature results in homeostasis of respiration, such that warm-acclimated and cold-acclimated plants display similar rates of respiration when measured at their respective growth temperatures (K6rner and Larcher, 1988).…”

Modelled net carbon gain responses to climate change in boreal trees: Impacts of photosynthetic parameter selection and acclimation

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