Abstract
The ability of a plant to acclimate metabolically to thermal changes is necessary to maintain a positive carbon balance. It is likely that a plant’s acclimatory potential is a function of leaf nitrogen and/or leaf carbohydrate status. Two important issues assessed concerning leaf dark respiration (RD) were the effects of growth temperature, light, and fertilization on thermal respiratory acclimation and changes in respiratory parameters (indicative of acclimation) throughout the dark period. Soybean (Glycine max (L.) Merr.) plants were grown in greenhouses under a full factorial treatment arrangement of temperature, light, and nutrition. RD was measured at three temperatures to estimate respiratory parameters (cool respiration R13, warm respiration R25, and the temperature response of respiration EO) three times throughout the night (6 pm, 11 pm, and 4 am). Respiratory parameters did not differ throughout the night. Thermal acclimation was observed in warm grown plants under optimal growing conditions (i.e., high light and high fertilization); however, acclimation did not occur when limitations were imposed (i.e., shade or no fertilization). These findings suggest thermal acclimation will occur so long as plants do not undergo limitations. This may have major implications for natural ecosystems and may play a role in assessing an ecosystems resiliency to climate change.
Highlights
Tissue dark respiration (RD) provides energy and carbon (C) skeletons for most plant metabolic processes [1] and accounts for up to 50% of gross productivity [2]
RD has been shown to be quite sensitive to variations in temperature [3]; respiratory metabolism is often adjusted to minimize acceleration of C loss at higher temperatures [4]. e opposite effect has been observed when plants are exposed to low or declining temperatures [5], and the absence of thermal acclimation has been reported in other studies [6]
Some studies have indicated correlations between this observed temperature response and leaf chemical traits [18]; there are a number of studies which have suggested that the International Journal of Agronomy mechanisms underlying RD may differ at warmer versus cooler growth temperatures, and as a result, energy of activation (EO) will be a function of these rates [4, 17]
Summary
Tissue dark respiration (RD) provides energy and carbon (C) skeletons for most plant metabolic processes [1] and accounts for up to 50% of gross productivity [2]. When measured over a range of short-term temperature changes, Q10 (quantifying the relative rise in RD with a 10°C increase in temperature) has been shown to introduce bias into these estimates [15], which can be avoided by using a modified Arrhenius equation to calculate an energy of activation (EO) [16]. While both Q10 and EO values can range widely across tissue types, species, and environments, they are frequently large enough to result in at least a doubling of RD with a 10°C increase in temperature [17]. Dillaway and Kruger [19] reported a strong correlation between warm respiration (R30; respiration at 30°C) and mass-based photosynthesis, while cool respiration (i.e., 20°C) appeared to be a function of leaf nitrogen concentration ([N]). us, when assessing the relationships between leaf traits and respiratory temperature response, it is imperative that both cool and warm respiration (minimum of 10°C temperature spread) are assessed but separately
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