International Journal of Agronomy

International Journal of Agronomy / 2018 / Article

Research Article | Open Access

Volume 2018 |Article ID 2015073 |

Dylan N. Dillaway, Michael C. Tyree, John K. Jackson, "Effects of Light and Nutrition Manipulations on Thermal Respiratory Acclimation and Nocturnal Dynamics of Leaf Dark Respiration", International Journal of Agronomy, vol. 2018, Article ID 2015073, 10 pages, 2018.

Effects of Light and Nutrition Manipulations on Thermal Respiratory Acclimation and Nocturnal Dynamics of Leaf Dark Respiration

Academic Editor: Yong In Kuk
Received11 Jul 2018
Accepted15 Nov 2018
Published02 Dec 2018


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.

1. Introduction

Tissue dark respiration (RD) not only provides energy and carbon (C) skeletons for most plant metabolic processes [1] but also accounts for up to 50% of gross productivity [2]. Climate clearly exerts a strong influence on plant C balance as a whole, and this impact on tissue RD is an important determinant of that balance being positive or negative [2]. In the short term, RD has been shown to be quite sensitive to variations in temperature [3]; however, respiratory metabolism is often adjusted to minimize acceleration of C loss at higher temperatures [4]. The 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]. Clearly, the nature and extent of thermal RD acclimation appear to differ significantly across species and growth environments [712]. When thermal acclimation is detected, it may be a result of changes in RD at a predetermined base or cool temperature [10, 13], changes in the temperature response [7], or both [14].

Exponential functions are commonly used to describe the relationship between temperature and RD. However 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]. Some studies have indicated correlations between this observed temperature response and leaf chemical traits [18]; however, there are a number of studies which have suggested that the mechanisms underlying RD may differ at warmer versus cooler growth temperatures, and as a result, EO (shape of temperature response curve) will be a function of these rates [4, 17]. For example, 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]). Thus, 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 equally but separately.

Studies which assess the respiratory response of plant tissues typically do not account for changes in respiration rates and or the temperature response of respiration throughout the nocturnal period [7, 14, 1925]. Cumulative night-time respiration is often calculated using the temperature response of respiration measured at one point-in-time (usually just after sunset or just prior to sunrise) [19]. However, it is unknown whether this temperature response of respiration at the onset of darkness is in fact identical to the temperature response of respiration found at the conclusion of the nocturnal period [26, 27]. One theory proposed to explain the observed differences in the temperature response of respiration across climate gradation is changes in [N] [2, 28, 29]. However, none of the previously correlated variables can explain why the temperature response of respiration might change either throughout the night or as a result of longer-term adjustments to growth temperature (i.e., thermal acclimation). Given that leaf [N] should be a relatively stable leaf chemical property (at least in the short-term), if a differential decline in respiration rates at contrasting temperature regimes is observed throughout the night, it should result mainly from changes in warm respiration indicating that this decline may be driven by carbohydrate concentration in the leaf.

This research addresses three important and related issues concerning leaf dark respiration:(i)We assessed the effects of growth temperature, light, and fertilization on the temperature response of respiration and thus respiratory thermal acclimation. Thermal acclimation of respiration depends in large part on two important respiratory parameters including base respiration (cool respiration) and the temperature response of respiration (EO, analogous to Q10) [4, 17]. For the purpose of this study, we adopted the theoretical construct of Atkin and Tjoelker [4] in which two types of acclimations are possible (Type I and Type II). Type I is theorized to be a result of a shift in the temperature response of RD (i.e., Q10 or EO), and Type II is theorized to be a result of a shift in RD at low temperatures (i.e., cool respiration (R13 in our study)). Based on current research, additional insight regarding the mechanistic underpinnings driving shifts in these variables is needed. We hypothesized that EO would decrease with increased growth temperature due to a decline in warm respiration (R25). Cool respiration (R13) will not change as a result of growth temperature.(ii)We assessed the temporal temperature response of respiration throughout the dark period. Cumulative night-time respiration and the nature of thermal acclimatory adjustments cannot be predicted with a high level of confidence, to date. It is unknown whether these variables change throughout the dark period of a 24-hour span. We hypothesize that EO and R25 will decline throughout the night regardless of treatment but the decline will be more pronounced in the “warm” grown plants owing to faster depletion of carbohydrate stores. R13 will remain stable throughout the night due to its strong correlation with leaf [N].(iii)Another principal goal of this research is to understand the fundamental mechanistic underpinnings of leaf dark respiration (warm respiration, cool respiration, and the temperature response of respiration) through manipulations of leaf carbohydrate concentration and leaf [N] status of plants growing at contrasting growth temperatures. In this regard, we hypothesized that EO and R25 will be lower in the low-light treatments due to their positive correlation with total leaf nonstructural carbohydrate (TNC), while R13 will be nonresponsive to light treatments due to its lack of correlation with leaf TNC. Because of the strong relationship between leaf [N] and cool respiration (R13), the no fertilization treatment will exhibit a lower R13 relative to the fertilization treatment; however, fertilization will show no apparent effect on R25 or EO.

2. Materials and Methods

2.1. Study Design and Treatments

This work was conducted using university greenhouses located at Louisiana Tech University in Ruston, LA, from February to March 2010. This study employed a randomized complete block design replicated three times with the treatments arranged as a full 2 × 2 × 2 factorial. Soybean (Glycine max (L.) Merr.) seeds were sown on 23 February 2010, in 4.4 L pots filled with a uniform soil mixture (Metro mix-300, Sun-gro horticulture, Bellevue, Washington). Seeds were germinated in a common greenhouse under ambient CO2 and a constant temperature of 23°C for approximately two weeks prior to treatment initiation.

Fertilizer and growth temperature treatments were initiated on 8 Mar. 2010. Seedlings were randomly moved to one of four greenhouses. Two houses were designated “warm” houses and maintained at a day/night temperature of 30/23°C, while two houses were designated “cool” houses and maintained at a day/night temperature of 20/13°C, resulting in a ∼10°C spread in temperature both during the day and night periods. Duplicate houses were used for each growth temperature treatment to ensure any responses were an effect of our treatments and not random differences among greenhouses. Half of all seedlings within each house were fertilized with a controlled release fertilizer (Osmocote, 15-9-12, Scott’s, Marysville, OH). In each house, fertilized (F) and nonfertilized (NF) seedlings were grown under high light conditions. Soybean plants were grown for an additional two weeks after transitioning seedlings to treatment rooms in order to allow plants to fully acclimate to their new growth conditions and develop new foliage under their respective temperature regime. Shade treatments were initiated the morning prior to respiration measurements. Plants were shaded for approximately 14 hours prior to respiration measurement. During each measurement period, a subset of high light plants was moved into a shade house. Shade houses provided approximately 30% of full sunlight and were designed to reduce daily C fixation of “low-light” plants relative to “high-light” plants (LL and HL, respectively).

2.2. Respiration Measurements

Respiration measurements were conducted for three consecutive days (23rd, 24th, and 25th Mar.). During each measurement period, nocturnal measurements were taken three times (beginning at 1800, 2300, and 0400 h) in order to examine the variability in key respiratory parameters throughout the night. Leaf dark respiration and its response to temperature were measured, for each treatment, during three “campaigns” throughout the night, using a Li-Cor 6400 portable photosynthesis machine (Li-Cor Biosciences, Lincoln, NE) with a 6 cm2 cuvette. Dark respiration (RD) was determined on the youngest, fully expanded leaf from six plants per treatment, at three cuvette temperatures (13°, 18°, and 23°C). Partial pressure of CO2 (pCO2) inside the cuvette reference chamber was maintained at 400 ppm (∼40 Pa) using the CO2 mixer on the Li-Cor 6400. As in recent studies of leaf gas exchange [19, 30], we included a correction factor recommended by Pons and Welschen [31] in order to account for the “gasket effect” of commercially available photosynthesis systems.

The response of RD to temperature was calculated using a modified Arrhenius equation [16, 18, 28]. The Arrhenius equation was chosen (as opposed to the Q10 approach) so that estimates were not dependent on measurement temperature. The use of the Arrhenius equation allows us to calculate RD for a particular leaf (with its unique EO and temperature-adjusted RD) at any temperature of interest. Respiratory responses to growth environments were examined using several calculated parameters, including temperature-adjusted rates (Respiration at 25°C (R25) and respiration at 13°C (R13)), along with the temperature response of respiration (EO). Respiration rates at temperatures as low as or lower than 15°C are commonly used to assess “cool” respiratory metabolism in studies of RD acclimation [4, 10, 18].

2.3. Leaf Morphology and Chemistry

At the conclusion of each respiration campaign, all measured leaves were harvested, their projected leaf areas determined, and placed in a 70°C oven. After 72 hours, the leaves were removed from the oven and weighed. Leaf area and dry mass were used to calculate specific leaf area (SLA), which was used to convert leaf RD to a mass basis (nmol g−1·s−1). Leaves were then ground to a fine-powder and sent for C and N analysis (Brookside Laboratories, Ohio).

An additional set of leaves, proximal to (and serving as a proxy for) those measured for RD, were harvested simultaneously with individual RD measurement campaigns. These samples were immediately frozen in a −20°C freezer. Leaves were then freeze-dried using a benchtop lyophilizer (VirTis Bench Top, SP Industries Inc., NY), ground to a fine-powder with a mortar and pestle, and analyzed for concentrations of total nonstructural carbohydrate (TNC) and its components (starch and soluble sugars), employing enzyme digestion and colorimetric assays similar to those detailed in Kaelke et al. [32]. Leaf starch and leaf [N] were then regressed against respiratory parameters (i.e., R25, EO, and R13) in order to determine the variables driving changes in the temperature response of respiration and temperature-adjusted rates of respiration.

2.4. Data Analyses

Determination of respiratory thermal acclimation was analyzed using analysis of variance with repeated measures where block, growth temperature, light, and fertilization main effects and interactions were treated as fixed effects. Time of night and all associated interaction terms were treated as random effects. All subsamples were averaged and assumptions checked using plots of normality curves and residuals prior to statistical analysis. For regression analysis, outlier observations were identified using Cook’s distance procedure and removed when appropriate. All analyses were conducted using PROC MIXED and PROC REG in SAS 9.3 [33].

3. Results

3.1. Comparisons of Leaf Respiration at Common Temperatures

Estimates of RD at a common temperature were calculated for cool metabolism and warm metabolism (R13 and R25). R25 was higher in the cool treatment under high light regardless of the associated fertilization treatment (Figure 1(c)).

Under low light, R25 was not significantly different from the “warm” grown plants under either fertilization treatment (Figure 1(c)). R13 in “cool” grown plants was higher than “warm” grown plants only in the high light, fertilized (HL,F) treatment but did not appear to vary under other combinations of light and fertilization (either low light or low nutrition) (Figure 1(b)). Within temperature regimes, R13 in “warm” grown plants was unaffected by light and nutrition manipulations ( and , respectively). R25 in “warm” grown plants did not differ within HL or LL, but both HL,F and HL,NF were higher than their LL counterparts ( and , respectively) (Figure 1(c)). Within “cool” grown plants, R13 was significantly higher in the HL,F combination than all other light and fertilization combinations (). R25 in “cool” grown plants was significantly higher in the HL,F combination than the HL,NF plants (). Both the F and NF plants under HL were significantly greater ( and , respectively) than their LL counterparts. R25 showed no difference between the LL,F and LL,NF plants (; Figure 1(c)).

3.2. Temperature Sensitivity of Leaf Respiration

The temperature sensitivity of respiration (EO) was significantly increased in “cool” grown plants relative to “warm” grown plants in all treatments with the exception of the LL,NF treatment (Figure 1(a)). Within the “cool” grown plants, EO was significantly greater in the HL treatments than the LL treatments, regardless of the associated fertilization treatment (). Within the “warm” grown plants, there was no significant difference among any light-fertilization combinations with the exception of HL,F plants being greater than LL,F ().

3.3. Temporal Dynamics of Leaf Respiration and Leaf Carbohydrate

Throughout the night, we observed no significant change in R13, R25, or EO in any treatment combination or temperature environment (Table 1). In addition, leaf starch, leaf soluble carbohydrate (TSC), and leaf total nonstructural carbohydrate (TNC) did not differ throughout the night (Table 1).

Num.Den.Resp. parametersNonstructural C

Between subject effects
Temp. (TC)1130.0020.03<0.00010.020.030.01
Light (L)1130.00040.002<0.00010.010.060.23
Fert. (F)1130.650.420.21<0.00010.01<0.0001
TC × L1130.380.060.0020.630.210.77
TC × F1130.850.830.
L × F1130.200.310.040.840.090.51
TC × L × F1130.360.050.110.450.710.45

Within subject effects
TC × time2300.490.210.940.960.530.90
L × time2300.750.190.120.590.120.41
F × time2300.850.870.600.990.680.79
TC × L × time2300.230.760.200.590.970.71
TC × F × time2300.970.770.940.890.260.49
L × F × time2300.830.310.320.920.370.93

3.4. Leaf Carbohydrate Concentration

Leaf carbohydrate concentration (both starch and soluble carbohydrates) was affected by our treatments (Figure 2). Fertilization had the greatest effect on both starch () and soluble carbohydrate () (Table 1). Temperature and light also had a significant effect on starch ( and , respectively) and soluble carbohydrates ( and , respectively). We did not, however, find any interactions between light, temperature, and fertilization with the exception of starch which showed an interaction between temperature and fertilization (; Table 1).

3.5. Leaf Nitrogen Concentration

Leaf [N] did not differ among fertilized plants between “cool” and “warm” grown plants in either HL or LL (Table 2). However, we did find significant differences in leaf [N] between “cool” and “warm” grown plants under HL () and LL (). Lowest leaf [N] concentrations occurred in the HL,NF in the “warm” grown plants.

Leaf attributesLight,FertWarmCoolP value

Mass-based leaf C (mg·g−1)HL,NF418 ± 6417 ± 20.96
HL,F425 ± 8422 ± 100.87
LL,NF394 ± 42423 ± 70.20
LL,F413 ± 4416 ± 40.87

Mass-based leaf N (mg·g−1)HL,NF38 ± 347 ± 20.04
HL,F59 ± 259 ± 31.00
LL,NF45 ± 556 ± 20.01
LL,F63 ± 265 ± 20.63

Area-based leaf N (g·cm−2)HL,NF1.48 ± 0.111.57 ± 1.100.74
HL,F2.18 ± 0.162.03 ± 0.190.66
LL,NF2.11 ± 0.222.25 ± 0.190.61
LL,F2.94 ± 0.282.63 ± 0.140.25

SLA (g·cm−2)HL,NF39.5 ± 2.733.8 ± 1.90.11
HL,F36.9 ± 2.434.2 ± 1.90.48
LL,NF46.9 ± 2.240.0 ± 1.60.06
LL,F46.3 ± 3.940.3 ± 2.40.10

3.6. Relationships among Respiration Parameters and Associated Leaf Traits

R13 was not correlated with leaf [N] under any treatment combination with the exception of “cool” grown plants under HL which was only marginally significant (r2 = 0.29; ; Figure 3(a)). No relationship was evident between leaf [N] and R25 or EO (data not shown). R25 was significantly correlated with leaf starch across treatments in both “warm” and “cool” grown plants (r2 = 0.46; and r2 = 0.29; , respectively; Figure 4). However, within the cold grown plants the low light, fertilization treatment was anomalous and was left out of the regression analysis (Figure 4(a)). Analysis of covariance (ANACOVA) showed a slightly significant () difference in the relationship (slopes) among our treatments.

4. Discussion

Accurately accounting for thermal acclimation in carbon cycle models can have a profound effect on annual respiration estimates [34, 35, 36]. Given that studies which report on the presence or absence of thermal respiratory acclimation are often contradictory, for example, [6, 7, 10, 11, 14, 18, 19, 24, 3744], our study is unique in that it was designed to manipulate precursors for warm, i.e., carbohydrates, [19] and cool respiration, i.e., leaf [N] [11,19, 43, 4549], in order to analyse the mechanistic underpinnings of the temperature response of respiration (EO), warm respiration (R25 in our case), and cool respiration (R13 in our case). This was done in an attempt to help explain why these contradictory results in published findings of acclimation, or lack thereof, exist.

Our results, however, only partially supported our hypotheses in that we did observe respiratory acclimation, and this acclimation did result from a decrease in EO with increasing growth temperature, as expected. Interestingly, these acclimatory responses were only evident in plants grown with no light or nutrition manipulations, indicating that plants growing in less than ideal situations (LL and NF) may be incapable of acclimating to increased temperatures. It was also apparent that this lack of acclimation in our LL, NF combinations were much stronger when two manipulations were combined as opposed to just one (i.e., either light or nutrition). It appears that light controlled these acclimatory responses much more strongly than nutrition evidenced by the fact that the HL,NF plants were still capable of thermal respiratory acclimation while the LL,F plants showed no evidence of acclimation. We observed no overall change in R13 with changes in growth temperature with very few exceptions across treatments. This was not expected due to the strong previously published relationships between cool respiration and leaf [N] [2, 19, 28], but we did not observe a change in R13 which is indicative of Type I acclimation as defined by Atkin and Tjoelker [4].

Because of the suggested link between leaf respiration rates and mitochondrial substrate supply, i.e., carbohydrates; [20, 50], we also hypothesized that we would observe a decline in both EO and R25 throughout the night due to a depletion of leaf carbohydrate and that this decline would be much more pronounced in the warm grown plants. Previous reports have indicated that as much as a 50% decline in leaf starch can occur throughout a 12-hour dark period [51]. Surprisingly, we observed no discernible change in any of our respiration parameters or carbohydrate concentrations throughout the night. This stability of both the temperature response and warm respiration may be in part due to the stability of leaf carbohydrate concentrations.

We did observe a decline in EO and R25 in the “low-light” (LL) treatments, regardless of fertilization, but this was not a function of leaf carbohydrate status. We found a slight increase in leaf nonstructural C (starch and soluble sugars) in our low-light treatments, which is likely a function of reduced C use throughout the day as a result of the shade treatment. Both “warm” and “cool” grown plants across treatments showed a strong positive correlation between leaf starch and R25. Within the “cool” grown plants, however, the LL,F treatment was considered an outlier and was not included in the regression analysis (Figure 4; circled observations). We hypothesize that the reasoning behind this anomalous treatment is that even though starch is likely a source of energy for the enzymatic reactions associated with leaf RD, the starch concentration in a leaf is not affected by simply one day of reduced photosynthesis as designed in this experiment, and due to the decrease in photosynthetic rate, there was a drastic reduction in respiration rate indicating a direct link between photosynthesis and respiration, possibly through a decline in ATP-consumption rates [20]. This link between these two associated metabolic processes has been shown in numerous studies [11, 14, 19, 37, 5257]. It is equally as likely that this same phenomenon was not observed in the warm grown plants due to the increased demand for substrate because of the 10°C increase in night temperature associated with the “warm” treatment. Utilizing light response curves for soybean from Lauer et al. [57] and measuring ASat rates on HL plants (data not shown), we estimate that our LL plants experienced an approximately 60% reduction in photosynthetic rates as a result of our shade treatments (i.e., 30% of full sunlight). This estimate reasonably assumes that the short duration of the LL treatment (1 day) would not be enough time to impact leaf photochemical efficiency (slope) or the light saturation. Even with this substantial decrease in photosynthesis, starch and especially soluble carbohydrate concentrations in fertilized plants remained drastically higher than their NF counterparts in the “cool” treatment.

While the plants in our study were clearly not “starved” for nitrogen (even within the nonfertilized treatment based upon leaf N values of 3.8–5%), we did increase leaf [N] significantly with our fertilization treatment. We did observe shifts in allocation which are indicative of a nitrogen limitation. Ruffy et al. [58] suggested that nitrogen limitations can cause a general decline in the plants carbohydrate utilization efficiency which ultimately would result in a shift of allocation from roots to shoots. As reported in Ruffy et al. [58], we also observed a 22% increase in the shoot to root ratio although this was only marginally significant between fertilized and unfertilized plants (). It is important that more studies be conducted with more drastic nitrogen limitations imposed to tease out the mechanistic underpinnings of nutrient limitations on thermal acclimation of leaf dark respiration.

5. Conclusions

If the results of this study translate into similar findings in field situations and similar trends were to be found in photosynthetic acclimatory responses to stressors, this study has far-reaching implications for both managed and unmanaged (natural) landscapes. If plants are unable to acclimate metabolically to increased temperatures when grown in lower nutrition or low light (or a combination of these situations), agricultural (managed) and natural ecosystems which have these characteristics may be much more susceptible to current and future temperature increases associated with climate change. This limitation hypothesis which would potentially allow natural and managed ecosystems to be classified as to their potential resiliency to climate change needs to be thoroughly addressed in future studies.

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.


This work was presented as a poster and abstract at the 98th Ecological Society of America Annual Meeting, Minneapolis, MN (August 2013).

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.


The authors would like to thank Jessica LaGrone for her assistance with data collection and Roxie A. Jordan, Greenhouse Lab Supervisor, Louisiana Tech Department of Agriculture, for providing greenhouse space and technical support. This work was supported by National Science Foundation (NSF), EPSCoR Pilot funding program (grant number NSF(2010)-PFUND-200), and McIntire-Stennis formula funding (grant no. LAZ00074).


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