Antioxidant Metabolism, Photosystem II, and Fatty Acid Composition of Two Tall Fescue Genotypes With Different Heat Tolerance Under High Temperature Stress

Hu, Lianlian; Bi, Aoyue; Hu, Zhengrong; Amombo, Erick; Li, Huiying; Fu, Jinmin

doi:10.3389/fpls.2018.01242

Cited by 35 publications

(31 citation statements)

References 59 publications

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“…The membrane stability of most alfalfa cultivars was significantly affected by heat stress, which may reveal the heat sensitivity of the cultivars. Our results were in agreement with the findings of Kumar et al [32] in chickpea, Sita et al [30] in lentil, and Hu et al [21] in tall fescue, who reported higher EL under heat stress. The increase in lipid peroxidation might be as a result of the overproduction and accumulation of ROS, which then causes membrane peroxidation, protein degradation, and DNA damage to severely inhibit growth [33][34][35].…”

Section: Discussionsupporting

confidence: 94%

“…Another heat sensitive cultivar (Gibraltar) showed a significant reduction in PI ABS . A similar result was reported in tall fescue under heat stress [21]. In addition, Fahad et al [29] reported a significant reduction in the photosynthetic activities of two rice cultivars under high day and night temperatures.…”

Section: Discussionsupporting

confidence: 74%

“…Furthermore, chlorophyll a fluorescence analysis was performed on the above four cultivars to identify the most heat sensitive and heat tolerant alfalfa cultivars. Chlorophyll a fluorescence analysis is a powerful and nondestructive method to study the photosynthetic behavior of plants and is widely applied to screen tolerant species [21,47]. In this study, heat stress affected the chlorophyll a fluorescence and altered the OJIP fluorescence transient curve of all alfalfa cultivars.…”

Section: Discussionmentioning

confidence: 84%

“…The MDA content was determined by the thiobarbituric acid (TBA) method according to a previous report [21]. Briefly, previously prepared 1 mL crude enzyme extract was mixed with 2 mL of reaction mixture containing 20% (v/v) trichloroacetic acid and 0.5% (v/v) thiobarbituric acid.…”

Section: Determination Of Mda Contentmentioning

confidence: 99%

“…Based on the comprehensive heat tolerance evaluation, four alfalfa cultivars-two relatively heat tolerant (Bara310SC and Magna995) and two relatively heat sensitive (Gibraltar and WL712)-were selected and further evaluated by Chl a fluorescence analysis to select the most heat-tolerant and -sensitive alfalfa. Chl a fluorescence transient was measured using a pulse-amplitude modulation (PAM) fluorometer (PAM2500 Heinz Walz GmbH, Eichenring, Germany) according to the previous report [21]. Briefly, the leaves were kept in the dark for 30 min, and all measurements were taken using a saturating light intensity of 2000 µmol photons m −2 s −1 .…”

Section: Chlorophyll a (Chl A) Fluorescence Analysismentioning

confidence: 99%

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Effect of Heat Stress on Growth and Physiological Traits of Alfalfa (Medicago sativa L.) and a Comprehensive Evaluation for Heat Tolerance

Wassie

Zhang

et al. 2019

Agronomy

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Alfalfa (Medicago sativa L.) is a valuable forage legume, but its production is largely affected by high temperature. In this study, we investigated the effect of heat stress on 15 alfalfa cultivars to identify heat-tolerant and -sensitive cultivars. Seedlings were exposed to 38/35 °C day/night temperature for 7 days and various parameters were measured. Heat stress significantly reduced the biomass, relative water content (RWC), chlorophyll content, and increased the electrolyte leakage (EL) and malondialdehyde (MDA) content of heat-sensitive alfalfa cultivars. However, heat-tolerant cultivars showed higher soluble sugar (SS) and soluble protein (SP) content. The heat tolerance of each cultivar was comprehensively evaluated based on membership function value. Cultivars with higher mean membership function value of 0.86 (Bara310SC) and 0.80 (Magna995) were heat tolerant, and Gibraltar and WL712 with lower membership function value (0.24) were heat sensitive. The heat tolerance of the above four cultivars were further evaluated by chlorophyll a fluorescence analysis. Heat stress significantly affected the photosynthetic activity of heat-sensitive cultivars. The overall results indicate that Bara310SC and WL712 are heat-tolerant and heat-sensitive cultivars, respectively. This study provides basic information for understanding the effect of heat stress on growth and productivity of alfalfa.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 84%

Section: Determination Of Mda Contentmentioning

confidence: 99%

Section: Chlorophyll a (Chl A) Fluorescence Analysismentioning

confidence: 99%

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Effect of Heat Stress on Growth and Physiological Traits of Alfalfa (Medicago sativa L.) and a Comprehensive Evaluation for Heat Tolerance

Wassie

Zhang

et al. 2019

Agronomy

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The use of 5‐aminolevulinic acid to reduce heat‐stress‐related damages in tall fescue

2020

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Heat stress is a major abiotic stress that damages cool‐season turfgrasses, such as tall fescue (Festuca arundinacea Schreb.), during summer months. Heat stress results in oxidative damage, reductions in photosynthesis, and ultimately can cause plant death. Exogenous applications of 5‐aminolevulinic acid (ALA) have previously been demonstrated to improve abiotic stress tolerance in a number of crops by improving chlorophyll levels and reducing oxidative damage, two major indicators of heat stress in plants. Experiments were conducted in growth chamber conditions to determine the effect of ALA application on heat stress in tall fescue plants and to confirm if ALA could alleviate damage related to inhibited photosynthesis or oxidative damages associated with high temperature. A rate of 100 mg L−1 ALA was determined to be effective in eliciting positive tall fescue responses during heat stress with plants maintaining better visual characteristics. Plants treated with ALA had greater levels of chlorophyll as well as photosynthetic performance under heat stress than plants that were not treated with ALA. Additionally, ALA plants had reduced oxidative damage associated with greater antioxidant activities of the enzymes catalase (CAT), ascorbate peroxidase (APX), and glutathione reductase (GR). The use of ALA was demonstrated to be effective in reducing heat stress related damages in tall fescue.

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Research advances in molecular mechanisms regulating heat tolerance in cool‐season turfgrasses

Rossi,

Huang

2024

Crop Science

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Cool‐season turfgrasses widely used on golf courses, athletic fields, and other landscapes are environmentally and economically important, but they are functionally and aesthetically damaged under prolonged exposure to high temperatures because of their sensitivity to heat stress. Because the consequences of climate change include elevated global temperatures, it is necessary to understand mechanisms underlying heat tolerance in cool‐season turfgrasses to improve heat tolerance and maintain high‐quality turf during the summer, when heat stress is most severe. This paper identifies major metabolic pathways associated with genes differentially expressed in heat‐tolerant cultivars or species of different turfgrasses by overviewing research from studies using comparative transcriptomics, proteomics, and biotechnological approaches and provides insight into progress toward elucidating the genetic and molecular factors regulating heat tolerance in cool‐season turfgrasses. Key molecular factors and genes associated with heat tolerance in cool‐season turfgrasses include those in the following cellular and metabolic processes or pathways: (1) cell cycle and DNA synthesis, replication, stability, and binding factors; (2) heat shock proteins for stress protection and protease enzymes controlling protein degradation or turnover; (3) carbohydrate metabolism for chloroplast development, chlorophyll degradation enzymes regulating the stay‐green phenotype, photochemical efficiency, carboxylation, and cytochrome respiratory activities; (4) activation of antioxidant metabolism for oxidation protection; (5) modulation of lipid saturation and composition to maintain cellular membrane integrity; and (6) upregulation of secondary metabolism for stress defense. Understanding how these regulatory mechanisms cohesively operate during heat stress will facilitate the development of cool‐season turfgrass germplasm with greater heat tolerance through breeding and biotechnological methods.

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Antioxidant Metabolism, Photosystem II, and Fatty Acid Composition of Two Tall Fescue Genotypes With Different Heat Tolerance Under High Temperature Stress

Cited by 35 publications

References 59 publications

Effect of Heat Stress on Growth and Physiological Traits of Alfalfa (Medicago sativa L.) and a Comprehensive Evaluation for Heat Tolerance

Effect of Heat Stress on Growth and Physiological Traits of Alfalfa (Medicago sativa L.) and a Comprehensive Evaluation for Heat Tolerance

The use of 5‐aminolevulinic acid to reduce heat‐stress‐related damages in tall fescue

Research advances in molecular mechanisms regulating heat tolerance in cool‐season turfgrasses

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