Differential Acclimation of Enzymatic Antioxidant Metabolism and Photosystem II Photochemistry in Tall Fescue under Drought and Heat and the Combined Stresses

Bi, Aoyue; Fan, Jibiao; Hu, Zhengrong; Wang, Guangyang; Amombo, Erick; Fu, Jinmin; Hu, Tao

doi:10.3389/fpls.2016.00453

Cited by 52 publications

(35 citation statements)

References 69 publications

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“…When changes are not too rapid or severe, there is an acclimation and protection of the PSII (e.g. Bi et al 2016). Paired with our measurements of leaf water content and maximum efficiency of PSII photochemistry (F v / fm), we found that the allocation of root length to deeper roots allowed seedlings to kept track with the lowering of the water table and provide shoots with sufficient water throughout the 8-week drought period to prevent damages to the photosystem.…”

Section: Rooting Depth and Total Root Lengthsmentioning

confidence: 67%

Root growth plasticity to drought in seedlings of perennial grasses

2019

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Aim Root growth strategies may be critical for seeding survival and establishment under dry conditions, but these strategies and their plasticity are little known. We aim to document the ability of young grass seedlings to adjust their root system architecture, root morphology and biomass allocation to roots to promote water uptake and survival under progressive drought. Methods Seedlings growing in columns filled with sand and exposed to drought or well-watered controls were repeatedly harvested for determination of biomass fractions, root length, −architecture and-morphology in a greenhouse experiment. Allometric scaling exponents and standardised major axis regression were used to investigate allocation patterns. Results Young seedlings were able to sustain leaf turgor and functions during eight weeks of progressive drought through phenotypic plasticity of the primary root system producing deeper and simpler roots. Biomass allocation to roots decreased or did not respond, and other components of root morphology showed only moderate plasticity. Conclusion Our results suggest that morphological and architectural plasticity of the primary root system may well be key features for dehydration avoidance and survival in grass seedlings under moderate drought when allocation of biomass to roots and development of secondary roots are constrained.

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Section: Rooting Depth and Total Root Lengthsmentioning

confidence: 67%

Root growth plasticity to drought in seedlings of perennial grasses

2019

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“…Interestingly, a mutant deficient in thylakoid APX did not display similar sensitivity to the stress combination, suggesting that ROS accumulation at the cytosol plays a key regulatory role in this response (Koussevitzky et al ). In addition, the sensitivity of Festuca arundinacea plants to combined drought and heat was recently associated with lower SOD activity and higher H 2 O 2 accumulation (Bi et al ).…”

Section: Introductionmentioning

confidence: 99%

Plant adaptations to the combination of drought and high temperatures

Zandalinas

Mittler

Balfagón

et al. 2017

Physiologia Plantarum

778

499

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Under field conditions crops are routinely subjected to a number of different abiotic stress factors simultaneously. Recent studies revealed that the response of plants to a combination of different abiotic stresses is unique and cannot be directly extrapolated from simply studying each of the different stresses applied individually. These studies have also identified specific regulatory transcripts, combinations of metabolites and proteins, and physiological responses that are unique to specific stress combinations, highlighting the importance of studying abiotic stress combination in plants. Here we describe the interactions between drought and other abiotic stresses with emphasis on drought and heat stress. We compile new data about the different molecular, physiological and metabolic adaptations of different plants and crops to this stress combination and we highlight the importance of reactive oxygen species (ROS) metabolism and stomatal responses for plant acclimation to drought and heat stress combination. We further emphasize the need for developing crops with enhanced tolerance to drought and heat stress combination in order to mitigate the negative impacts of predicted global climatic changes on agricultural production worldwide.

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“…It is well established that heat stress has detrimental impacts on various key physiological, biochemical, and metabolic processes of plants, and disrupts normal cellular homeostasis [2]. It 2 of 20 promotes the overproduction and accumulation of reactive oxygen species (ROS), malondialdehyde (MDA) production due to lipid peroxidation, photoinhibition, protein denaturation, and accumulation of compatible solutes [7][8][9]. The oxidative stress caused by heat stress further leads to cellular injury, membrane proteins breakage, lipid peroxidation, photosynthetic pigment degradation, and enzymes and nucleic acid denaturation [4,10,11].…”

Section: Introductionmentioning

confidence: 99%

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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Differential Acclimation of Enzymatic Antioxidant Metabolism and Photosystem II Photochemistry in Tall Fescue under Drought and Heat and the Combined Stresses

Cited by 52 publications

References 69 publications

Root growth plasticity to drought in seedlings of perennial grasses

Root growth plasticity to drought in seedlings of perennial grasses

Plant adaptations to the combination of drought and high temperatures

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

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