Differential Responses of Antioxidants, Abscisic Acid, and Auxin to Deficit Irrigation in Two Perennial Ryegrass Cultivars Contrasting in Drought Tolerance

Zhang, Xunzhong; Ervin, Erik H.; Liu, Yiming; Hu, Guofu; Shang, Chaoqun; Fukao, T.; Alpuerto, Jasper B.

doi:10.21273/jashs.140.6.562

Cited by 34 publications

(47 citation statements)

References 45 publications

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“…The results of this study indicate that the drought tolerant cultivar Alamo had greater ability to scavenge ROS than the drought sensitive Dacotah. Our results agreed with the previous studies, which showed that various drought-tolerant plants present different isozyme patterns during drought stress conditions [40, 41].…”

Section: Discussionsupporting

confidence: 93%

Differential responses of antioxidants and dehydrin expression in two switchgrass (Panicum virgatum) cultivars contrasting in drought tolerance

Liu

et al. 2018

Preprint

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1 switchgrass (Panicum virgatum) cultivars contrasting in drought 2 tolerance 3 4 5 Abstract 28 Drought stress is a major limiting factor for plant growth and development in many regions of the 29 world. This study was designed to investigate antioxidant metabolism and dehydrin expression 30 responses to drought stress in two switchgrass cultivars (drought tolerant Alamo, and drought 31 sensitive Dacotah) contrasting in drought tolerance. The plants were subjected to well-watered 32 [100% evapotranspiration (ET)] or drought stress (30%-50% ET) conditions for up to 24 d in 33 growth chambers. Drought stress decreased leaf relative water content (RWC), increased leaf 34 electrolyte leakage (EL), leaf malondialdehyde (MDA) content in two cultivars, but Alamo 35 exhibited higher leaf RWC level, lower leaf EL and MDA when compared to Dacotah at 24 d of 36 drought treatment. Drought stress also increased superoxide dismutase (SOD), catalase (CAT) and 37 ascorbate peroxidase (APX) activities in two cultivars, Alamo had relatively higher SOD, CAT 38 and APX activities and greater abundance of SOD and APX isozymes than Dacotah at 24 d of 39 drought treatment. Alamo had higher abundance of 55 KDa and 18 KDa dehydrin accumulation 40 than Dacotah under drought treatment. Relative genes expression level of PvCAT1, PvAPX2, 41 PvERD and PvPIP1;5 in Alamo were significantly higher than Dacotah at 24 d of drought 42 treatment. These results suggest that increase in antioxidant enzymes and accumulation of 43 dehydrin were highly related with switchgrass drought tolerance. Antioxidant enzyme activity, 44 isozyme expression and dehydrin abundance could provide a useful screening tool to identify 45 relative drought tolerance in switchgrass cultivars.46 47 48 3 49 50 51 Introduction 52 Drought occurs in all climates and many parts of the world every year when sufficient water 53 needed to sustain an area is not available, causing significantly impacts on plants growth, 54 development and crop yield [1]. Worldwide losses in crop yields from drought probably exceed 55 the losses from all other abiotic stress combined [2, 3]. Drought stresses cause oxidative stress by 56 contributing to reactive oxygen species (ROS) such as superoxide radical (O •-2), hydrogen 57 peroxide (H2O2), hydroxyl radical (OH•) and singlet oxygen ( 1 O2) [4]. ROS can seriously disrupt 58 normal metabolism through oxidative damage to nucleic acids, lipids, protein and damage 59 membrane function [5]. However, ROS may also serve as a transduction signal during drought 60 stress and improve stress defense mechanisms of plant [6]. ROS levels that are too low or too high 61 affect plant growth and development, maintaining ROS levels within a moderate range is important 62 for plants [7, 8]. 63 Plants have developed an antioxidant defense system in response to the high level of ROS [9]. 64 There are generally two repairing mechanisms that plants have developed to scavenge free ROS: 65 (i) production of antioxidants or antioxidant enzymes that directly react with and s...

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Section: Discussionsupporting

confidence: 93%

Differential responses of antioxidants and dehydrin expression in two switchgrass (Panicum virgatum) cultivars contrasting in drought tolerance

Liu

et al. 2018

Preprint

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“…Man et al (2011) noted that IAA in tall fescue declined in response to drought stress. Zhang et al (2015) found that deficit irrigation increased leaf IAA in perennial ryegrass ( Lolium perenne L.). A similar result was found with Kentucky bluegrass by Krishnan and Merewitz (2015).…”

Section: Discussionmentioning

confidence: 99%

“…Alterations in hormone metabolism are associated with plant responses to abiotic stresses (Zhang et al, 2009;Man et al, 2011;Huang et al, 2014;Zhang et al, 2015). Abscisic acid (ABA), cytokinins, and indole-3-acetic acid (IAA) are hormones that mediate signaling events involved in plant acclimation to stress and are involved in senescence (Strivastava, 2002;Davies, 2010).…”

Section: S-131mentioning

confidence: 99%

“…A s a consequence of climate change and increasing demands on potable water in growing urban areas, water for use in turfgrass irrigation is becoming increasingly limited. Given irrigation restrictions, deficit irrigation may contribute to turfgrass quality decline, especially during summer months in many regions (Zhang et al, 2012, 2015). Creeping bentgrass ( Agrostis stolonifera L.) is a cool‐season species widely used for golf course putting greens and tees in temperate climates.…”

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Auxin and Trinexapac‐Ethyl Impact on Root Viability and Hormone Metabolism in Creeping Bentgrass under Water Deficit

Zhang

Ervin

et al. 2017

Crop Science

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Plant growth regulators have been used to improve turfgrass quality and drought tolerance. This study was designed to investigate if foliar application of auxin (indole‐3‐butyric acid [IBA] at 2 μM) and trinexapac‐ethyl (TE, 45 g ha−1), alone or in a combination, improves creeping bentgrass (Agrostis stolonifera L.) root growth and hormone metabolism under water‐deficit conditions. The plants were subjected to well‐watered or water‐deficit stress (40–50% evapotranspiration replacement) conditions for up to 42 d in growth chambers. Water deficit reduced turf quality and net photosynthetic rate (Pn), leaf indole‐3‐acetic acid (IAA), isopentenyl adenosine (iPA) content, and root viability. Exogenous application of TE or IBA, alone or in a combination, improved turf quality, Pn, and stomatal conductance under water‐deficit conditions. Under water deficit, TE, IBA, and TE + IBA treatments also increased leaf IAA, iPA, and abscisic acid content relative to the control. The combination treatment (TE + IBA) increased root biomass relative to the control under water‐deficit and well‐watered conditions. Under water deficit, TE, IBA, TE + IBA increased root viability by 16.7, 32.2, and 56.2%, respectively, relative to the control. Under well‐watered conditions, IBA, with or without TE, also increased leaf IAA and iPA, as well as root viability. Results suggest that foliar application of auxin and TE at proper rates may promote root viability and hormonally mediated adjustments to drought, resulting in improved turf quality under water‐deficit conditions.

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“…Hormone content of JA, OPDA, ABA, and IAA was analyzed using liquid chromatography–tandem mass spectrometry (LC‐MS/MS) following the procedure described by Zhang et al (2015b) with some modifications. Leaf tissue was collected at 23 d of drought stress, immediately frozen with liquid N, and stored at −80°C for subsequent analysis.…”

Section: Methodsmentioning

confidence: 99%

Stimulation of Growth and Alteration of Hormones by Elevated Carbon Dioxide for Creeping Bentgrass Exposed to Drought

et al. 2019

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Drought stress inhibits shoot growth of cool‐season turfgrass species, and elevated CO2 concentration may mitigate the adverse effects of drought through alteration of hormone production. The objective of this study was to determine whether elevated CO2–enhanced drought tolerance in creeping bentgrass (Agrostis stolonifera L.) was associated with the stimulation of tiller and stolon growth and the alteration of stress‐regulating and growth‐regulating hormone accumulation. Creeping bentgrass (cv. Penncross) plants were established for 24 d at ambient (400 μL L−1) or elevated (800 μL L−1) CO2 concentration and subsequently exposed to drought stress for 23 d by withholding irrigation. Drought stress caused significant reduction in leaf relative water content and tiller density, whereas both parameters, as well as stolon length, were maintained at significantly higher values in CO‐treated plants compared with those at ambient CO2 under drought stress. The positive effects of elevated CO2 on the maintenance of leaf hydration and the promotion of tiller density and stolon growth in creeping bentgrass exposed to drought stress could be associated with the suppression of drought‐induced accumulation of abscisic acid and the increase in the endogenous content of isopentenyladenosine, jasmonic acid, and the jasmonic acid precursor 12‐oxo‐phytodienoic acid. These results suggest that the elevated CO2–enhanced growth of tillers and stolons in creeping bentgrass under drought stress could be regulated in part by the adjustment of endogenous hormone levels.

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Differential Responses of Antioxidants, Abscisic Acid, and Auxin to Deficit Irrigation in Two Perennial Ryegrass Cultivars Contrasting in Drought Tolerance

Cited by 34 publications

References 45 publications

Differential responses of antioxidants and dehydrin expression in two switchgrass (Panicum virgatum) cultivars contrasting in drought tolerance

Differential responses of antioxidants and dehydrin expression in two switchgrass (Panicum virgatum) cultivars contrasting in drought tolerance

Auxin and Trinexapac‐Ethyl Impact on Root Viability and Hormone Metabolism in Creeping Bentgrass under Water Deficit

Stimulation of Growth and Alteration of Hormones by Elevated Carbon Dioxide for Creeping Bentgrass Exposed to Drought

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