Soil Temperature Effects on Root Respiration and the Ecology of Alpine and Subalpine Plants

Higgins, Paul D.; Spomer, George G.

doi:10.1086/336849

Cited by 37 publications

(17 citation statements)

References 37 publications

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“…A survey of the literature shows that Q 10 values (typically within the 10-30 • C measurement temperature range) range from 1.4 to 4.2 for leaf R (Azcón-Bieto 1992; Larigauderie and Körner 1995;Tjoelker et al 2001) and 1.1 to 4.6 for root R (Higgins and Spomer 1976;Boone et al 1998;Tjoelker et al 1999b). This suggests that there is little difference in overall range of Q 10 values exhibited by leaves and roots.…”

Section: Leaves V Rootsmentioning

confidence: 99%

The hot and the cold: unravelling the variable response of plant respiration to temperature

Atkin¹,

Bruhn

Hurry

et al. 2005

Functional Plant Biol.

441

410

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This paper is part of The Evans Review series, named for Dr Lloyd Evans. The series contains reviews that are critical,state-of-the-art evaluations that aim to advance our understanding, rather than being exhaustive compilations of information, and are written by invitation.Abstract. When predicting the effects of climate change, global carbon circulation models that include a positive feedback effect of climate warming on the carbon cycle often assume that (1) plant respiration increases exponentially with temperature (with a constant Q 10 ) and (2) that there is no acclimation of respiration to long-term changes in temperature. In this review, we show that these two assumptions are incorrect. While Q 10 does not respond systematically to elevated atmospheric CO 2 concentrations, other factors such as temperature, light, and water availability all have the potential to influence the temperature sensitivity of respiratory CO 2 efflux. Roots and leaves can also differ in their Q 10 values, as can upper and lower canopy leaves. The consequences of such variable Q 10 values need to be fully explored in carbon modelling. Here, we consider the extent of variability in the degree of thermal acclimation of respiration, and discuss in detail the biochemical mechanisms underpinning this variability; the response of respiration to long-term changes in temperature is highly dependent on the effect of temperature on plant development, and on interactive effects of temperature and other abiotic factors (e.g. irradiance, drought and nutrient availability). Rather than acclimating to the daily mean temperature, recent studies suggest that other components of the daily temperature regime can be important (e.g. daily minimum and / or night temperature).In some cases, acclimation may simply reflect a passive response to changes in respiratory substrate availability, whereas in others acclimation may be critical in helping plants grow and survive at contrasting temperatures. We also consider the impact of acclimation on the balance between respiration and photosynthesis; although environmental factors such as water availability can alter the balance between these two processes, the available data suggests that temperature-mediated differences in dark leaf respiration are closely linked to concomitant differences in leaf photosynthesis. We conclude by highlighting the need for a greater process-based understanding of thermal acclimation of respiration if we are to successfully predict future ecosystem CO 2 fluxes and potential feedbacks on atmospheric CO 2 concentrations.

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Section: Leaves V Rootsmentioning

confidence: 99%

The hot and the cold: unravelling the variable response of plant respiration to temperature

Atkin¹,

Bruhn

Hurry

et al. 2005

Functional Plant Biol.

441

410

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“…varies with measurement temperature (e.g. Higgins & Spomer, 1976 ;Berry & Raison, 1981 ;Crawford & Palin, 1981). An example is the decline in Q "!…”

Section:   Q "!     mentioning

confidence: 99%

Response of root respiration to changes in temperature and its relevance to global warming

2000

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Global warming over the next century is likely to be associated with a change in the extent to which atmospheric and soil temperatures fluctuate, on both a daily and a seasonal basis. The average annual temperature of the Earth's surface is expected to increase, as is the frequency of hot days. In this review, we explore what effects short-term and long-term changes in temperature are likely to have on root respiratory metabolism, and what impacts such changes will have on daily, seasonal and annual CO # release by roots under field conditions. We demonstrate that Q "! values, and the degree of acclimation, differ between and within plant species. Changes in the temperature sensitivity of respiration with measuring temperature are highlighted. Temperature-dependent changes in adenylate control and substrate supply are likely to control the Q "! and degree of acclimation of root respiration. Limitations in respiration capacity are unlikely to control respiratory flux at most temperatures. The potential role of nonphosphorylating pathways such as the alternative oxidase in controlling Q "! values is highlighted. The possibility that potentially rapid changes in adenylate control might underlie the acclimation response (rather than slow changes in enzyme capacity) has implications for the total amount of CO # respired by roots daily and annually. Our modelling suggests that rapid acclimation will result in near-perfect homeostasis of respiration rates and minimize annual CO # release. However, annual CO # release increases substantially if the speed of full acclimation is lower. Our modelling exercise also shows that high Q "! values have the potential to increase daily and annual CO # release substantially, particularly if the frequency of hot days increases after global warming.

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“…

ABSTRACT whe effect of temperature upon ion uptake and respiration was investigated with excised roots ofcorn ( Ze mays) and barley ( Horden_ vgae).A strong Iibition (Qlo -5 to 8) of ion uptake was observed at temperatures below 10 C. At It is well known that low soil temperatures may affect plant growth and that there are great differences among species in their tolerance of low soil temperature (2,(6)(7)(8)13 (approximately 0.07 ,uCi/,umol). This concentration of Rb was assumed to be rate-saturating for the low concentration isotherm mechanism (4).

…”

mentioning

confidence: 99%

“…It is well known that low soil temperatures may affect plant growth and that there are great differences among species in their tolerance of low soil temperature (2,(6)(7)(8)13). Presumably these effects are due to an inhibition of root function by low temperature.…”

mentioning

confidence: 99%

Effects of Low Temperature on Respiration and Uptake of Rubidium Ions by Excised Barley and Corn Roots

Carey¹

1978

Plant Physiol.

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whe effect of temperature upon ion uptake and respiration was investigated with excised roots ofcorn ( Ze mays) and barley ( Horden_ vgae).A strong Iibition (Qlo -5 to 8) of ion uptake was observed at temperatures below 10 C. At It is well known that low soil temperatures may affect plant growth and that there are great differences among species in their tolerance of low soil temperature (2,(6)(7)(8)13 (approximately 0.07 ,uCi/,umol). This concentration of Rb was assumed to be rate-saturating for the low concentration isotherm mechanism (4). Separate samples of excised roots with a fresh wt of 200 to 300 mg in a "tea bag" (5) were conditioned for 20 min in a 0.5 mM CaSO4 solution at the measurement temperature. The "tea bags" were then transferred into 300 ml of labeled solution at the appropriate temperature for either 20 min below 15 C or 10 min above 15 C.After the uptake period, any 'Rb present in the readily exchangeable "free spaces" of the roots was removed by desorption in 0.05 mM RbNO3 and 0.5 mm CaSO4 at 0 C for I min and 30 min at 25 C. The 'Rb retained by the roots was determined by immersing the roots in 10 ml of liquid scintillation fluid (Toluene, Triton X100, Omnifluor, water, 1000:500:6.66:166) (Fig. 1). The data for ion uptake when graphed as an Arrhenius plot (Fig. 2)

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Soil Temperature Effects on Root Respiration and the Ecology of Alpine and Subalpine Plants

Cited by 37 publications

References 37 publications

The hot and the cold: unravelling the variable response of plant respiration to temperature

The hot and the cold: unravelling the variable response of plant respiration to temperature

Response of root respiration to changes in temperature and its relevance to global warming

Effects of Low Temperature on Respiration and Uptake of Rubidium Ions by Excised Barley and Corn Roots

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