Physiological mechanism of strigolactone enhancing tolerance to low light stress in cucumber seedlings

Zhou, Xinpeng; Tan, Zhanming; Zhou, Yaguang; Guo, Shirong; Shen, Tong; Shu, Sheng

doi:10.1186/s12870-021-03414-7

Cited by 43 publications

(25 citation statements)

References 47 publications

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“…In addition, GR24 increased nitric acid (NO) in the Cd-sensitive genotype, which was associated with modulation of the NO signaling pathway, increased SOD and POD activities, augmented AsA and GSH levels, and improved the activity of ascorbate-glutathione cycle enzymes, including APX, GPX, GR, DHAR, and MDHAR ( Qiu et al, 2021 ). Likewise, 10 μM GR24 enhanced the accumulation of carbohydrates and the synthesis of sucrose-related enzyme activities, increased the photosynthetic efficiency and plant biomass, antioxidant enzyme activities, and antioxidant substance contents, and reduced H 2 O 2 and MDA levels in cucumber ( Cucumis sativus ) seedlings under low light stress ( Zhou et al, 2022 ). Similarly, exogenous SL relieved oxidative damage and photosynthetic inhibition of cucumber seedlings under salt stress through the MAPK cascade pathway ( Zhang et al, 2022 ).…”

Section: Interplay Of Plant Hormones In Conferring Abiotic-induced Ox...mentioning

confidence: 99%

Plant hormones and neurotransmitter interactions mediate antioxidant defenses under induced oxidative stress in plants

et al. 2022

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Due to global climate change, abiotic stresses are affecting plant growth, productivity, and the quality of cultivated crops. Stressful conditions disrupt physiological activities and suppress defensive mechanisms, resulting in stress-sensitive plants. Consequently, plants implement various endogenous strategies, including plant hormone biosynthesis (e.g., abscisic acid, jasmonic acid, salicylic acid, brassinosteroids, indole-3-acetic acid, cytokinins, ethylene, gibberellic acid, and strigolactones) to withstand stress conditions. Combined or single abiotic stress disrupts the normal transportation of solutes, causes electron leakage, and triggers reactive oxygen species (ROS) production, creating oxidative stress in plants. Several enzymatic and non-enzymatic defense systems marshal a plant’s antioxidant defenses. While stress responses and the protective role of the antioxidant defense system have been well-documented in recent investigations, the interrelationships among plant hormones, plant neurotransmitters (NTs, such as serotonin, melatonin, dopamine, acetylcholine, and γ-aminobutyric acid), and antioxidant defenses are not well explained. Thus, this review discusses recent advances in plant hormones, transgenic and metabolic developments, and the potential interaction of plant hormones with NTs in plant stress response and tolerance mechanisms. Furthermore, we discuss current challenges and future directions (transgenic breeding and genome editing) for metabolic improvement in plants using modern molecular tools. The interaction of plant hormones and NTs involved in regulating antioxidant defense systems, molecular hormone networks, and abiotic-induced oxidative stress tolerance in plants are also discussed.

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Section: Interplay Of Plant Hormones In Conferring Abiotic-induced Ox...mentioning

confidence: 99%

Plant hormones and neurotransmitter interactions mediate antioxidant defenses under induced oxidative stress in plants

et al. 2022

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“…Membrane lipid peroxidation is the major cause of oxidative damage in plants exposed to abiotic stresses [ 37 ]. Specifically, LL stress primarily causes the generation of ROS, such as O 2 ∙ − and H 2 O 2 , which consequently induces a lipid peroxidation and membrane permeability increase, and ultimately triggers the occurrence of oxidative stress [ 38 , 39 ]. In our present study, the level of ROS is remarkably increased when plants are exposed to LL stress, but exogenous PBZ application attenuates this effect.…”

Section: Discussionmentioning

confidence: 99%

Paclobutrazol Ameliorates Low-Light-Induced Damage by Improving Photosynthesis, Antioxidant Defense System, and Regulating Hormone Levels in Tall Fescue

Liu

Long

Liu

et al. 2022

IJMS

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Paclobutrazol (PBZ) is a plant-growth regulator (PGR) in the triazole family that enhances plant tolerance to environmental stresses. Low-light (LL) intensity is a critical factor adversely affecting the growth of tall fescue (Festuca arundinacea Schreb.). Therefore, in this study, tall fescue seedlings were treated with PBZ under control and LL conditions to investigate the effects of PBZ on enhancing LL stress resistance by regulating the growth, photosynthesis, oxidative defense, and hormone levels. Our results reveal that LL stress reduced the total biomass, chlorophyll (Chl) content, photosynthetic capacity, and photochemical efficiency of photosystem II (PSII) but increased the membrane lipid peroxidation level and reactive oxygen species (ROS) generation. However, the application of PBZ increased the photosynthetic pigment contents, net photosynthetic rate (Pn), maximum quantum yield of PSII photochemistry (Fv/Fm), ribulose-1,5-bisphosphate carboxylase (RuBisCO) activity, and starch content. In addition, PBZ treatment activated the antioxidant enzyme activities, antioxidants contents, ascorbate acid-glutathione (AsA-GSH) cycle, and related gene expression, lessening the ROS burst (H2O2 and O2∙−). However, the gibberellic acid (GA) anabolism was remarkably decreased by PBZ treatment under LL stress, downregulating the transcript levels of kaurene oxidase (KO), kaurenoic acid oxidase (KAO), and GA 20-oxidases (GA20ox). At the same time, PBZ treatment up-regulated 9-cis-epoxycarotenoid dioxygenase (NCED) gene expression, significantly increasing the endogenous abscisic acid (ABA) concentration under LL stress. Thus, our study revealed that PBZ improves the antioxidation and photosynthetic capacity, meanwhile increasing the ABA concentration and decreasing GA concentration, which ultimately enhances the LL stress tolerance in tall fescue.

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“…Particularly, T1 and T2 had the most significant enhancement effect, whereas T4 had an insignificant alleviation effect, indicating that the low concentration of SL could alleviate the inhibitory effect of drought stress on P. purpureum , and enhance its photosynthesis capacity. This finding may be due to the fact that SL can regulate the binding of Chl to membrane proteins and thus maintain the stability of chloroplast cyst-like membranes, thereby enhancing the plant’s ability to use light energy to overcome photosystem damage and the photosynthesis performance of the plant [ 17 ]. Sedaghat et al [ 46 ] obtained similar findings in their study on the effect of SL on wheat ( Triticum aestivum L.) under drought stress, in which SL application enhances the net Pn, Gs, and Tr of wheat.…”

Section: Discussionmentioning

confidence: 99%

“…SLs further reportedly inhibit plant branching, control shape root morphology, enhance primary root cell growth to inhibit adventitious root development and growth, and regulate plant secondary growth [ 12 , 13 ]. They are also associated with drought resistance, cold tolerance, salt tolerance and other stress tolerance [ 14 – 17 ], and photomorphogenesis [ 18 ] and serve as positive regulators of plant responses to certain abiotic stresses [ 19 ]. Sattar et al [ 20 ] applied SL to maize ( Zea mays L.) under drought stress and found that SL improves the water relationship of maize seedlings, increases photosynthesis pigments and gas-exchange parameters, and improves antioxidant enzyme activity.…”

Section: Introductionmentioning

confidence: 99%

Effects of exogenous Strigolactone on the physiological and ecological characteristics of Pennisetum purpureum Schum. Seedlings under drought stress

Feng

et al. 2022

BMC Plant Biol

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Background Drought is one of the main environmental factors limiting plant growth and development. Pennisetum purpureum Schum. was used to explore the mitigation effects of exogenous strigolactone (SL) on drought stress during the seedling stage. The effects of different concentrations (1, 3, 5, and 7 μmol·L− 1) of SL on the photosynthesis characteristics, growth performance, and endogenous abscisic acid (ABA) of P. purpureum under drought stress were studied. Results Exogenous SL could effectively alleviate the inhibitory effect of drought stress on P. purpureum growth. Compared with drought stress, the net photosynthesis rate, stomatal conductance, transpiration rate, and water-use efficiency of the leaves of P. purpureum after SL treatment significantly increased, thereby exerting a significant mitigation effect on the decrease in photosystem II maximum photochemical efficiency and the performance index based on light absorption caused by drought. Moreover, the exogenous application of SL can effectively increase the fresh and dry weight of the leaves and roots and the main-root length. After applying SL for 120 h, the ABA content of P. purpureum decreased significantly. The activity of key enzymes of photosynthesis significantly increased after 48 h of external application of SL to P. purpureum. Conclusions SL treatment can improve the photosynthesis performance of P. purpureum leaves under drought conditions and increase the antioxidant capacity of the leaves, thereby reducing the adverse effects of drought, promoting the growth of P. purpureum, and effectively improving the drought resistance of P. purpureum.

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Physiological mechanism of strigolactone enhancing tolerance to low light stress in cucumber seedlings

Cited by 43 publications

References 47 publications

Plant hormones and neurotransmitter interactions mediate antioxidant defenses under induced oxidative stress in plants

Plant hormones and neurotransmitter interactions mediate antioxidant defenses under induced oxidative stress in plants

Paclobutrazol Ameliorates Low-Light-Induced Damage by Improving Photosynthesis, Antioxidant Defense System, and Regulating Hormone Levels in Tall Fescue

Effects of exogenous Strigolactone on the physiological and ecological characteristics of Pennisetum purpureum Schum. Seedlings under drought stress

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