Adenylate control contributes to thermal acclimation of sugar maple fine‐root respiration in experimentally warmed soil

Jarvi, Mickey P.; Burton, Andrew J.

doi:10.1111/pce.13098

Cited by 21 publications

(35 citation statements)

References 69 publications

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“…ATP is the key energy currency in cells and, as such, supports the broad functions of growth, maintenance, ion uptake, and assimilation in roots. The findings of Jarvi and Burton (2018) of a 20% to 30% increase in respiration rates upon removal of adenylate control are comparable to a prior in situ field study of loblolly pine (Pinus taeda) fine roots (Drake, Stoy, Jackson, & DeLucia, 2008). Clearly, fine root respiratory capacity appears more than adequate to meet energy demands.…”

Section: Response Of Respiration To Temperature At Multiple Scalessupporting

confidence: 75%

The role of thermal acclimation of plant respiration under climate warming: Putting the brakes on a runaway train?

Tjoelker

2018

Plant Cell & Environment

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Section: Response Of Respiration To Temperature At Multiple Scalessupporting

confidence: 75%

The role of thermal acclimation of plant respiration under climate warming: Putting the brakes on a runaway train?

Tjoelker

2018

Plant Cell & Environment

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“…Supposedly, the smaller C uptake in the heatdrought treatment decreased phloem transport (Ruehr et al, 2009;Sevanto, 2014Sevanto, , 2018, which caused a strong depletion of soluble sugars and starch storage in roots. Total NSC levels were close to zero in the roots of the heat-drought seedlings, which may indicate critical C shortage in roots, limiting the otherwise high maintenance respiration in roots at high temperatures (Jarvi and Burton, 2018;Tjoelker, 2018). This could have affected root functionality and hence contributed to the observed large mortality rates in the heat-drought treatment.…”

Section: Metabolic Responses Toward Heat-drought Stressmentioning

confidence: 88%

Heat Waves Alter Carbon Allocation and Increase Mortality of Aleppo Pine Under Dry Conditions

Birami

Gattmann

Heyer

et al. 2018

Front. For. Glob. Change

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Climate extremes are likely to occur more frequently in the future, including a combination of heat waves and drought. However, the responses of trees to combined stress and their post-stress recovery are not fully understood yet. Therefore, this study investigated the responses of semi-arid Pinus halepensis seedlings to moderate drought, heat and combined heat-drought stress, as well as post-stress recovery. The seedlings were grown under controlled conditions and exposed to two 4-days-long heat periods, reaching air temperature maxima of 42 • C and vapor pressure deficit (VPD) of 7 kPa. Day-and nighttime canopy gas exchange was measured and differences in shoot and root allocation of non-structural carbohydrate (NSC) compounds (soluble sugars, starch, cyclitols, and carboxylic acids) assessed. Fluorescence parameters, nitrate levels, proline content and shoot water potential (ψ) provided additional indicators for stress severity and recovery performance. During the heat periods, net photosynthesis and stomatal conductance decreased immediately. This decline was modest under well-watered conditions, with transpiration and dark respiration rates remaining high and despite reductions in root NSC content, trees recovered following heat release. This was not the case in the heat-drought treatment, where stress resulted in high mortality rates and the few surviving seedlings showed reduced gas exchange rates and low root NSC content, while leaf nitrate and proline remained elevated even 3 weeks after heat release. Shoot ψ indicated that hydraulic failure was not the reason for mortality in the heat-drought seedlings. Instead, we argue that low transpiration rates, which resulted in needle temperatures >47 • C during heat stress (6 • C above air temperature) have caused irreversible damage. In summary, it could be demonstrated that heat waves in combination with moderate drought can either result in increased mortality or, if the seedlings survive, in delayed recovery. This highlights the potential of an increase in heat wave temperatures to trigger forest decline in semi-arid regions.

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“…Studies on how stem and root respiration are affected by warming under differential water regimes are uncommon in the literature. Several studies report decreased root respiration rates in response to decreased soil moisture (Bryla, Bouma, Hartmond, & Eissenstat, 2001;Burton, Pregitzer, Zogg, & Zak, 1998;Huang & Fu, 2000;Jarvi & Burton, 2018), but others suggest that root respiration is not significantly affected by combined effect of warming and reduced water availability (Bryla, Bouma, & Eissenstat, 1997). However, such comparisons are rare for stem respiration.…”

Section: Respirationmentioning

confidence: 99%

The temperature optima for tree seedling photosynthesis and growth depend on water inputs

Kumarathunge

Drake

Tjoelker

et al. 2020

Global Change Biology

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Understanding how tree growth is affected by rising temperature is a key to predicting the fate of forests in future warmer climates. Increasing temperature has direct effects on plant physiology, but there are also indirect effects of increased water limitation because evaporative demand increases with temperature in many systems. In this study, we experimentally resolved the direct and indirect effects of temperature on the response of growth and photosynthesis of the widely distributed species Eucalyptus tereticornis. We grew E. tereticornis in an array of six growth temperatures from 18 to 35.5°C, spanning the climatic distribution of the species, with two watering treatments: (a) water inputs increasing with temperature to match plant demand at all temperatures (Wincr), isolating the direct effect of temperature; and (b) water inputs constant for all temperatures, matching demand for coolest grown plants (Wconst), such that water limitation increased with growth temperature. We found that constant water inputs resulted in a reduction of temperature optima for both photosynthesis and growth by ~3°C compared to increasing water inputs. Water limitation particularly reduced the total amount of leaf area displayed at Topt and intermediate growth temperatures. The reduction in photosynthesis could be attributed to lower leaf water potential and consequent stomatal closure. The reduction in growth was a result of decreased photosynthesis, reduced total leaf area display and a reduction in specific leaf area. Water availability had no effect on the response of stem and root respiration to warming, but we observed lower leaf respiration rates under constant water inputs compared to increasing water inputs at higher growth temperatures. Overall, this study demonstrates that the indirect effect of increasing water limitation strongly modifies the potential response of tree growth to rising global temperatures.

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Adenylate control contributes to thermal acclimation of sugar maple fine‐root respiration in experimentally warmed soil

Cited by 21 publications

References 69 publications

The role of thermal acclimation of plant respiration under climate warming: Putting the brakes on a runaway train?

The role of thermal acclimation of plant respiration under climate warming: Putting the brakes on a runaway train?

Heat Waves Alter Carbon Allocation and Increase Mortality of Aleppo Pine Under Dry Conditions

The temperature optima for tree seedling photosynthesis and growth depend on water inputs

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