High humidity alleviates photosynthetic inhibition and oxidative damage  of tomato seedlings under heat stress

Xu, Chao; Yang, Zhong-Jian; Yang, Shouping; Wang, L.; Wang, M.T.

doi:10.32615/ps.2019.168

Cited by 10 publications

(8 citation statements)

References 59 publications

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“…Increasing temperatures cause more and more severe problems for both the natural vegetation, and the agricultural crop production, worldwide (Niu and Xiang 2018, Xu et al 2020). Furthermore, not only the rising average temperature, but also the increasing frequency of temperature extremes is responsible for the troubles (Meehl and Tebaldi 2004).…”

Section: Introductionmentioning

confidence: 99%

Acclimation of photosynthetic processes and metabolic responses to elevated temperatures in cereals

Janda

Tajti

Hamow

et al. 2020

Physiologia Plantarum

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The aim of the present work was to better understand the molecular mechanisms of heat acclimation processes in cereals. A large number of winter and spring wheat, barley and oat varieties were grown under either control conditions (22/20°C) or under a mild heat stress (30°C) that induce the acclimation processes. The temperature dependence of chlorophyll a fluorescence induction and gas exchange parameters showed that heat acclimation increased the thermotolerance of the photosynthetic apparatus, but these changes did not differ sharply in the winter–spring type cereals. Similarly, to wheat, elevated temperature also led to increasing transpiration rate and reduced water use efficiency in barley and oat plants. A non‐targeted metabolomic analysis focusing on polar metabolites in two selected barley (winter type Mv Initium and spring type Conchita) and in two oat varieties (winter type Mv Hópehely and spring type Mv Pehely) revealed substantial differences between both the two species and between the acclimated and non‐acclimated plants. Several compounds, including sugars, organic acids, amino acids and alcohols could be separated and detected. The expression level of the CYP707, HSP90, galactinol synthase, raffinose synthase and α‐galactosidase genes showed genotype‐dependent changes after 1 day; however, the CYP707 was the only one, which was still upregulated in at least some of the genotypes. Results suggest that heat acclimation itself does not require general induction of primary metabolites. However, induction of specific routes, e.g. the induction of the raffinose family oligosaccharides, especially the synthesis of galactinol, may also contribute the improved heat tolerance in cereals.

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Section: Introductionmentioning

confidence: 99%

Acclimation of photosynthetic processes and metabolic responses to elevated temperatures in cereals

Janda

Tajti

Hamow

et al. 2020

Physiologia Plantarum

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“…The concentration determination of chlorophyll and carotenoids by using the method of Xu et al, 29 Healthy leaf samples were ground and extracted with 25 mL of acetone. Then, the mixture was centrifuged at room temperature at 4000 × g for 25 min.The absorbance was measured at 448 and 428 nm by using an ultraviolet spectrophotometer (UV-9100, LabTech, China).…”

Section: Methodsmentioning

confidence: 99%

Cold acclimation alleviates photosynthetic inhibition and oxidative damage induced by cold stress in citrus seedlings

Xu,

Wang,

Yang

et al. 2023

Plant Signaling & Behavior

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Cold stress seriously inhibits plant growth and development, geographical distribution, and yield stability of plants. Cold acclimation (CA) is an important strategy for modulating cold stress, but the mechanism by which CA induces plant resistance to cold stress is still not clear. The purpose of this study was to investigate the effect of CA treatment on the cold resistance of citrus seedlings under cold stress treatment, and to use seedlings without CA treatment as the control (NA). The results revealed that CA treatment increased the content of photosynthetic pigments under cold stress, whereas cold stress greatly reduced the value of gas exchange parameters. CA treatment also promoted the activity of Rubisco and FBPase, as well as led to an upregulation of the transcription levels of photosynthetic related genes ( rbcL and rbcS )，compared to the NA group without cold stress. In addition, cold stress profoundly reduced photochemical chemistry of photosystem II (PSII), especially the maximum quantum efficiency (F v /F m ) in PSII. Conversely, CA treatment improved the chlorophyll a fluorescence parameters, thereby improving electron transfer efficiency. Moreover, under cold stress, CA treatment alleviated oxidative stress damage to cell membranes by inhibiting the concentration of H 2 O 2 and MDA, enhancing the activities of superoxide dismutase (SOD), catalase (CAT), ascorbic acid peroxidase (APX) and glutathione reductase (GR), accompanied by an increase in the expression level of antioxidant enzyme genes ( CuZnSOD1 , CAT1, APX and GR ). Additionally, CA also increased the contents of abscisic acid (ABA) and salicylic acid (SA) in plants under cold stress. Overall, we concluded that CA treatment suppressed the negative effects of cold stress by enhancing photosynthetic performance, antioxidant enzymes functions and plant hormones contents.

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“…The stomatal limit value (Ls) was calculated by the equation Ls = 1 − C i / C a , where C a represents the atmospheric CO 2 concentration. 8 …”

Section: Methodsmentioning

confidence: 99%

“…Enzymatic antioxidants include superoxide dismutase (SOD), peroxidase (POD) and ascorbate peroxidase (APX), etc., which can maintain the balance between the production and scavenging of ROS by removing excess ROS in plants and protect plants from ROS-induced damage. 7 , 8 Therefore, the photosynthetic capacity and antioxidant capacity are highly important for normal growth and development of plants under HT stress. Non-enzymatic antioxidants include ascorbic acid (AsA), glutathione (GSH), phenolic compounds, and tocopherols, which can regulate the functions of main cells and participate in the…”

Section: Introductionmentioning

confidence: 99%

Exogenous spermidine enhances the photosynthetic and antioxidant capacity of citrus seedlings under high temperature

Tang

Liu

et al. 2022

Plant Signaling & Behavior

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Studies have not fully explained the underlying mechanism of spermidine-mediated heat tolerance. This study investigated the possible role of spermidine (Spd) in regulating citrus heat tolerance. The results showed that exogenous Spd effectively alleviated the limitation of high temperature (HT) on photosynthesis. Exogenous Spd increased the chlorophyll content, net photosynthetic rate, intercellular carbon dioxide concentration, stomatal conductance, maximum and effective quantum yield of PSII photochemistry, nonphotochemical quenching coefficient, and electron transport rate in citrus seedlings under HT stress, but declined the stomatal limitation value. In addition, Spd treatment promoted the dynamic balance of the citrus enzymatic and non-enzymatic antioxidants system. Spd application significantly increased the activity of superoxide dismutase, peroxidase, catalase, ascorbic acid, and glutathione and the expression level of corresponding genes at high temperature, while reducing the content of H 2 O 2 and malondialdehyde. Therefore, our findings suggested exogenous Spd significantly ameliorated citrus physiological and photosynthetic adaptation under HT stress, thereby providing helpful guidance for citrus cultivation in HT events.

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High humidity alleviates photosynthetic inhibition and oxidative damage of tomato seedlings under heat stress

Cited by 10 publications

References 59 publications

Acclimation of photosynthetic processes and metabolic responses to elevated temperatures in cereals

Acclimation of photosynthetic processes and metabolic responses to elevated temperatures in cereals

Cold acclimation alleviates photosynthetic inhibition and oxidative damage induced by cold stress in citrus seedlings

Exogenous spermidine enhances the photosynthetic and antioxidant capacity of citrus seedlings under high temperature

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