CO2 elevation modulates the response of leaf gas exchange to progressive soil drying in tomato plants

Liu, Jie; Hu, Tiantian; Fang, Liang; Peng, Xiaoying; Liu, Fulai

doi:10.1016/j.agrformet.2019.01.026

Cited by 55 publications

(46 citation statements)

References 42 publications

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“…However, these greater ABA levels had no corresponding impact on g s since the 700-plants tended to higher g s values than 380ones, and g s did not differ significantly between WW and MWD conditions in either genotype. This is in good agreement with reports of a delayed g s response to soil drought under eCO 2 in coffee (Avila et al 2020b) and tomato (Liu et al 2019). Moreover, eCO 2 might have altered the ABA regulated stomatal control under moderate drought.…”

Section: Can Eco 2 Mitigate the Drought Impacts At The Photosynthetic Level In Coffee?supporting

confidence: 92%

Intrinsic non-stomatal resilience to drought of the photosynthetic apparatus in Coffea spp. is strengthened by elevated air [CO2]

et al. 2020

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Growing water restrictions associated with climate changes constitute daunting challenges to crop performance. This study unveils the impacts of moderate (MWD) or severe (SWD) water deficit, and their interaction with air [CO2], on the photosynthetic apparatus of Coffea canephora Pierre ex A. Froehner cv. Conilon Clone 153 (CL153) and Coffea arabica L. cv. Icatu. Seven year-old potted plants grown under 380 (aCO2) or 700 μl l −1 (eCO2) [CO2] gradually reached predawn water potentials between −1.6 and −2.1 MPa (MWD), and below −3.5 MPa (SWD). Under drought, stomata closure was chiefly related to abscisic acid (ABA) rise. Increasing drought severity progressively affected gas exchange and fluorescence parameters in both genotypes, with non-stomatal limitations becoming gradually dominating, especially regarding the photochemical and biochemical components of CL153 SWD plants. In contrast, Icatu plants were highly tolerant to SWD, with minor, if any, negative impacts on the potential photosynthetic functioning and components (e.g., Amax, Fv/Fm, electron carriers, photosystems (PSs) and ribulose-1,5-bisphosphate carboxylase oxygenase (RuBisCO) activities). Besides, drought-stressed Icatu plants displayed increased abundance of a large set of proteins associated with the photosynthetic apparatus (PSs, light-harvesting complexes, cyclic electron flow, RuBisCO activase) regardless of [CO2]. Single eCO2 did not promote stomatal and photosynthetic down-regulation in both genotypes. Instead, eCO2 increased photosynthetic performance, moderately reinforced photochemical (PSs activity, electron carriers) and biochemical (RuBisCO, ribulose-5-phosphate kinase) components, whereas photoprotective mechanisms and protein abundance remained mostly unaffected. In both genotypes, under MWD, eCO2 superimposition delayed stress severity and promoted photosynthetic functioning with lower energy dissipation and PSII impacts, whereas stomatal closure was decoupled from increases in ABA. In SWD plants, most impacts on the photosynthetic performance were reduced by eCO2, especially in the moderately drought affected CL153 genotype, although maintaining RuBisCO as the most sensitive component, deserving special breeder’s attention to improve coffee sustainability under future climate scenarios.

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Section: Can Eco 2 Mitigate the Drought Impacts At The Photosynthetic Level In Coffee?supporting

confidence: 92%

Intrinsic non-stomatal resilience to drought of the photosynthetic apparatus in Coffea spp. is strengthened by elevated air [CO2]

et al. 2020

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“…For instance, drought and cold are significant factors that limit agricultural crop production [ 3 , 4 ]. Elevated CO 2 concentration (e[CO 2 ]) enhances plant photosynthesis and biomass even under adverse environmental conditions [ 5 , 6 ]. The e[CO 2 ] can increase water-use efficiency and enhance plant growth, leading to higher water use [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…The e[CO 2 ] can increase water-use efficiency and enhance plant growth, leading to higher water use [ 7 ]. On the one hand, Liu et al (2019) reported that e[CO 2 ] retarded tomato leaf’s response to progressive drought stress (DS) as reflected by the slow response of the net photosynthetic rate (P N ) and stomatal conductance (g s ) to DS under e[CO 2 ] than control [CO 2 ] [ 6 ]. On the other hand, plants grown under e[CO 2 ] showed greater cold tolerance than control [CO 2 ] [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, e[CO 2 ] together with decreased irrigation improve tomato water-use efficiency [ 18 ]. Liu et al (2019) suggested that e[CO 2 ] enhanced P N , increased the shoot C/N ratio, and retarded tomato responses to progressive soil drying [ 6 ]. On the other hand, melatonin was proved to be a crucial molecule involved in the tomato response to abiotic stresses [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

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The Alleviation of Photosynthetic Damage in Tomato under Drought and Cold Stress by High CO2 and Melatonin

Zhou

Wan

Jiang

et al. 2020

IJMS

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The atmospheric CO2 concentration (a[CO2]) is increasing at an unprecedented pace. Exogenous melatonin plays positive roles in the response of plants to abiotic stresses, including drought and cold. The effect of elevated CO2 concentration (e[CO2]) accompanied by exogenous melatonin on plants under drought and cold stresses remains unknown. Here, tomato plants were grown under a[CO2] and e[CO2], with half of the plants pre-treated with melatonin. The plants were subsequently treated with drought stress followed by cold stress. The results showed that a decreased net photosynthetic rate (PN) was aggravated by a prolonged water deficit. The PN was partially restored after recovery from drought but stayed low under a successive cold stress. Starch content was downregulated by drought but upregulated by cold. The e[CO2] enhanced PN of the plants under non-stressed conditions, and moderate drought and recovery but not severe drought. Stomatal conductance (gs) and the transpiration rate (E) was less inhibited by drought under e[CO2] than under a[CO2]. Tomato grown under e[CO2] had better leaf cooling than under a[CO2] when subjected to drought. Moreover, melatonin enhanced PN during recovery from drought and cold stress, and enhanced biomass accumulation in tomato under e[CO2]. The chlorophyll a content in plants treated with melatonin was higher than in non-treated plants under e[CO2] during cold stress. Our findings will improve the knowledge on plant responses to abiotic stresses in a future [CO2]-rich environment accompanied by exogenous melatonin.

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“…concentration will rise globally to 550 µmol mol − 1 in the middle of the present century, and increase to 700 ~ 900 µmol mol − 1 by the end of the 21 st century [2,3]. In addition, the greenhouse industry facilitated CO 2 fertilization to enhance plant growth and productivity in the semi-closed ecosystem, which was widely applied throughout the word to improve crop productivity.…”

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confidence: 99%

The rate-limiting step for photosynthetic CO2 utilization under varying atmospheric evaporative demand in Solanum lycopersicum (tomato)

Zhang¹,

Li²,

Yamori³

et al. 2020

Preprint

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Background: Despite atmospheric vapour pressure deficit (VPD) was demonstrated as significant environmental factors affecting plant photosynthesis and productivity, the regulating mechanism under varying atmospheric evaporative demand was still unclarified. The contribution of stomatal, mesophyll resistance and biochemical limitation imposed on photosynthesis in tomato under varying evaporative demand was highlighted in the present study. Quantitative photosynthetic limitation analysis across a series of VPD was performed in well-watered tomato, by combining gas exchange and chlorophyll fluorescence. Results: Photosynthetic performance in tomato was gradually depressed with increasing in VPD. Under low VPD condition, stomatal and mesophyll conductance were sufficiently high for CO2 transport, which facilitated high chloroplast CO2 concentration for carbon fixation. Stomatal and mesophyll limitation accounted a low fraction, and photosynthetic potential was mostly constrained by biochemical limitation inside chloroplasts under low VPD condition. With increasing in VPD, plant water stress was gradually pronounced and triggered declines in stomatal and mesophyll conductance. Contribution of stomatal and mesophyll limitation on photosynthesis increased gradually with rise in VPD. Consequently, the low CO2 availability inside chloroplast substantially constrained photosynthesis under high VPD condition. Conclusion: Photosynthetic potential in tomato was mostly constrained by biochemical limitation inside chloroplasts under low VPD condition. CO2 diffusion limitation in series of stomatal and mesophyll resistance was the key rate-limiting step for photosynthesis under high VPD condition.

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CO2 elevation modulates the response of leaf gas exchange to progressive soil drying in tomato plants

Cited by 55 publications

References 42 publications

Intrinsic non-stomatal resilience to drought of the photosynthetic apparatus in Coffea spp. is strengthened by elevated air [CO2]

Intrinsic non-stomatal resilience to drought of the photosynthetic apparatus in Coffea spp. is strengthened by elevated air [CO2]

The Alleviation of Photosynthetic Damage in Tomato under Drought and Cold Stress by High CO2 and Melatonin

The rate-limiting step for photosynthetic CO2 utilization under varying atmospheric evaporative demand in Solanum lycopersicum (tomato)

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