Foliar Application of 24-Epibrassinolide Improved Salt Stress Tolerance of Perennial Ryegrass

Sun, Shanshan; An, Malaviya; Han, Liebao; Yin, Shaowu

doi:10.21273/hortsci.50.10.1518

Cited by 28 publications

(27 citation statements)

References 31 publications

(44 reference statements)

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“…When exogenous BL was applied to the apple leaves, Na + content decreased with increased K + content, and thus the leaf Na + /K + ratio decreased ( Figure 5). This condition is consistent with the findings of Sun et al (2015b) in which 10 nM BL treatment reduced leaf Na + /K + and increased K + content in perennial ryegrass under salt stress. However, in the roots, exogenous BL notably increased K + content.…”

Section: Discussionsupporting

confidence: 92%

Exogenous Brassinolide Alleviates Salt Stress in Malus hupehensis Rehd. by Regulating the Transcription of NHX-Type Na+(K+)/H+ Antiporters

Zheng

Tian

2020

Front. Plant Sci.

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Brassinolide (BL) mediates various physiological processes and improves plant tolerance to abiotic stresses. However, the effects and mechanism of exogenous BL on the salt tolerance of apple seedlings remain unclear. Herein, we investigated the role of BL in the salt stress response of Malus hupehensis Rehd., a widely grown apple rootstock. Saltstressed apple seedlings showed significant decline in chlorophyll content and photosynthetic rate, and the application of 0.2 mg/L exogenous BL alleviated salt stress and maintained photosynthetic capacity. Exogenous BL application can strengthen the activities of superoxide dismutase and catalase and thereby eliminates reactive oxygen species (ROS) production induced by salt stress and promote the accumulation of proline and soluble sugar, thus maintaining osmotic balance. Furthermore, exogenous BL application decreased Na + accumulation and increased K + content in shoots and roots under salt stress by regulating the expression levels of Na + (K +)/H + antiporter genes (MhNHXs). MhBZR1 and MhBZR2, which are the key transcription factors in the BR signal transduction pathway, can directly bind to the promoter of MhSOS1 and MhNHX4-1, respectively, and inhibit their expression. Our findings would provide a theoretical basis for analyzing the mechanism of exogenous BL application on the salt tolerance of apples.

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Section: Discussionsupporting

confidence: 92%

Exogenous Brassinolide Alleviates Salt Stress in Malus hupehensis Rehd. by Regulating the Transcription of NHX-Type Na+(K+)/H+ Antiporters

Zheng

Tian

2020

Front. Plant Sci.

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“…Additionally, application of exogenous polyamines such as spermidine could improve salt stress tolerance in Kentucky bluegrass and zoysiagrass [25,31]. Some hormones such as epibrassinolide, salicylic acid and glycinebetaine could enhance the salt tolerance of weeping alkaligrass (Puccinellia distans) tall fescue, perennial ryegrass and Kentucky bluegrass [38][39][40][41][42]. Ethylene is a negative regulating hormone in the plant stress response pathway, and its suppression can protect perennial ryegrass against salt stress [43].…”

Section: Salt Stressmentioning

confidence: 99%

Mechanisms of Environmental Stress Tolerance in Turfgrass

et al. 2020

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Turfgrasses constitute a vital part of the landscape ecological systems for sports fields, golf courses, home lawns and parks. However, turfgrass species are affected by numerous abiotic stresses include salinity, heat, cold, drought, waterlogging and heavy metals and biotic stresses such as diseases and pests. Harsh environmental conditions may result in growth inhibition, damage in cell structure and metabolic dysfunction. Hence, to survive the capricious environment, turfgrass species have evolved various adaptive strategies. For example, they can expel phytotoxic matters; increase activities of stress response related enzymes and regulate expression of the genes. Simultaneously, some phytohormones and signal molecules can be exploited to improve the stress tolerance in turfgrass. Generally, the mechanisms of the adaptive strategies are integrated but not necessarily the same. Recently, metabolomic, proteomic and transcriptomic analyses have revealed plenty of stress response related metabolites, proteins and genes in turfgrass. Therefore, the regulation mechanism of turfgrass’s response to abiotic and biotic stresses was further understood. However, the specific or broad-spectrum related genes that may improve stress tolerance remain to be further identified. Understanding stress response in turfgrass species will contribute to improve stress tolerance of turfgrass.

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“…Brassinosteroids (BRs) belong to a class of polyhydroxylated steroid phytohormones that are implicated in the resistance to a broad spectrum of environmental cues such as heavy metals, drought, pesticides and salinity 18 – 20 , Exogenous application of the natural BR, 24-epibrassinolide (EBR), has enhanced growth, pigment constituents, photosynthetic attributes, osmolytes and antioxidant enzyme activity in crop plants under abiotic stresses 20 – 23 . Foliar application of EBR to plants controls a range of biochemical and physiological responses to salt stress 24 , 25 .…”

Section: Introductionmentioning

confidence: 99%

Exogenous application of calcium to 24-epibrassinosteroid pre-treated tomato seedlings mitigates NaCl toxicity by modifying ascorbate–glutathione cycle and secondary metabolites

Ahmad

Allah

Alyemeni

et al. 2018

Sci Rep

120

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The present study tested the efficacy of 24-epibrassinolide (EBL) and calcium (Ca) for mediating salinity tolerance in tomato. Salinity stress affected the morphological parameters of tomato as well as leaf relative water content (LRWC), photosynthetic and accessory pigments, leaf gas exchange parameters, chlorophyll fluorescence and the uptake of essential macronutrients. The salt (NaCl) treatment induced oxidative stress in the form of increased Na+ ion concentration by 146%, electrolyte leakage (EL) by 61.11%, lipid peroxidation (MDA) 167% and hydrogen peroxide (H2O2) content by 175%. Salt stress also enhanced antioxidant enzyme activities including those in the ascorbate–glutathione cycle. Plants treated with EBL or Ca after salt exposure mitigated the ill effects of salt stress, including oxidative stress, by reducing the uptake of Na+ ions by 52%. The combined dose of EBL + Ca reversed the salt-induced changes through an elevated pool of enzymes in the ascorbate–glutathione cycle, other antioxidants (superoxide dismutase, catalase), and osmoprotectants (proline, glycine betaine). Exogenously applied EBL and Ca help to optimize mineral nutrient status and enable tomato plants to tolerate salt toxicity. The ability of tomato plants to tolerate salt stress when supplemented with EBL and Ca was attributed to modifications to enzymatic and non-enzymatic antioxidants, osmolytes and metabolites.

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Foliar Application of 24-Epibrassinolide Improved Salt Stress Tolerance of Perennial Ryegrass

Cited by 28 publications

References 31 publications

Exogenous Brassinolide Alleviates Salt Stress in Malus hupehensis Rehd. by Regulating the Transcription of NHX-Type Na+(K+)/H+ Antiporters

Exogenous Brassinolide Alleviates Salt Stress in Malus hupehensis Rehd. by Regulating the Transcription of NHX-Type Na+(K+)/H+ Antiporters

Mechanisms of Environmental Stress Tolerance in Turfgrass

Exogenous application of calcium to 24-epibrassinosteroid pre-treated tomato seedlings mitigates NaCl toxicity by modifying ascorbate–glutathione cycle and secondary metabolites

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