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Seaweed Extract-based Biostimulant Impacts on Nitrate Reductase Activity and Root Viability of Ultradwarf Bermudagrass Subjected to Heat and Drought Stress

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dc.contributor.authorZhang, Xunzhongen
dc.contributor.authorTaylor, Zacharyen
dc.contributor.authorGoatley, Mikeen
dc.contributor.authorBooth, Jordanen
dc.contributor.authorBrown, Isabelen
dc.contributor.authorKosiarski, Kellyen
dc.date.accessioned2023-01-12T15:26:00Zen
dc.date.available2023-01-12T15:26:00Zen
dc.date.issued2022-10-01en
dc.date.updated2023-01-12T15:05:38Zen
dc.description.abstractBermudagrass is a warm-season turfgrass species widely used for sports fields, home lawns, and golf courses. Ultradwarf bermudagrass has been used for golf course greens, but its quality declines with abiotic stresses. This 2-year study was designed to investigate if foliar applications of seaweed extract-based biostimulant UtilizeVR could improve ultradwarf bermudagrass photosynthetic function, nitrate reductase activity, root growth, and root function while under heat stress and drought stress conditions. UtilizeVR was applied to ultradwarf bermudagrass canopy at 0, 88, 117, 175, and 234 lL•m22. Two weeks after the initial application of UtilizeVR , bermudagrass was subjected to heat (40/36 ◦C, day/night) and drought stress (40–50% evapotranspiration replacement) for up to 42 days. Heat stress and drought stress caused decline of the turf quality. Foliar application of UtilizeVR at 117, 175, and 234 lL•m22 biweekly consistently improved turf quality and leaf color ratings and increased leaf chlorophyll and carotenoid concentrations, net photosynthetic rate, nitrate reductase activity, and root growth and viability. On average, UtilizeVR at 117, 175, and 234 lL•m22 increased turf quality ratings by 9.1%, 12.1%, and 10.6%, respectively, net photosynthetic rates by 32.4%, 45.0%, and 35.0%, respectively, and nitrate reductase activity by 16.7%, 18.8%, and 14.6%, respectively, compared with the control. UtilizeVR at 117, 175, and 234 lL•m22 increased the root biomass, root length, surface area, and root volume compared with the control. UtilizeVR at 88, 117, 175, and 234 lL•m22 increased root viability by 46.2%, 73.1%, 88.5%, and 74.4%, respectively, relative to the control. The results of this study suggest that seaweed extract-based biostimulant UtilizeVR improves nitrogen metabolism, photosynthetic function, root growth, and root viability. Foliar application of UtilizeVR at rates between 117 and 175 lL•m22 biweekly can be considered an effective approach to improving ultradwarf bermudagrass performance under heat stress and drought stress environments.en
dc.description.versionPublished versionen
dc.format.extentPages 1328-1333en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.21273/HORTSCI16746-22en
dc.identifier.eissn2327-9834en
dc.identifier.issn0018-5345en
dc.identifier.issue10en
dc.identifier.urihttp://hdl.handle.net/10919/113147en
dc.identifier.volume57en
dc.language.isoenen
dc.publisherAmerican Society for Horticultural Scienceen
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.titleSeaweed Extract-based Biostimulant Impacts on Nitrate Reductase Activity and Root Viability of Ultradwarf Bermudagrass Subjected to Heat and Drought Stressen
dc.title.serialHortScienceen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherJournal Articleen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciencesen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/School of Plant and Environmental Sciencesen
pubs.organisational-group/Virginia Tech/Agriculture & Life Sciences/School of Plant and Environmental Sciences/Turf groupen

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