Effect of water regimes and harvest times on yield and phytochemical accumulation of two ginger species

dc.contributor.authorGatabazi, Auges
dc.contributor.authorMarais, Diana
dc.contributor.authorSteyn, Martin J.
dc.contributor.authorAraya, Hintsa
dc.contributor.authorDu Plooy, Christian
dc.contributor.authorNcube, Bhekumthetho
dc.contributor.authorMokgehle, Salmina
dc.date.accessioned2023-07-13T05:02:44Z
dc.date.issued2022-10
dc.description.abstractIn South Africa, both Commercial ginger (Zingiber officinale Roscoe) and African ginger (Siphonochilus aethiopicus (Schweinf.) BL Burtt) are significant medicinal plants. This study aimed to determine the effect of water regimes on the two-ginger species' phenolic content, antioxidant properties and yield at various harvest times. During the 2015/2016 and 2016/2017 crop seasons, a field experiment was conducted. The experiment used a randomised complete block design (RCBD) and included two ginger species, four irrigation regimes, and three replicate blocks. Four different levels of soil water availability (20-25%, 40-45%, 60-65%, and 80-85% maximum allowable depletion, MAD) were used. The severely stressed treatment (80-85% MAD) significantly increased total flavonoid and phenolic content and total antioxidant activity in both species, but the biomass yield was lower than the other treatments. The well-watered control (20-25% MAD) resulted in a significant increase in rhizome yield at different harvesting times but resulted in lower total flavonoid and phenolic content and total antioxidant activity for both species. However, the moderately stressed treatment (40-45% MAD) obtained a higher WUE, flavonoid, phenolic and antioxidant content without reducing yield significantly in both species. The results indicated a similar trend in phytochemical constituents for leaves and rhizomes. The species can be harvested seven to eight months after planting under open field conditions. The accumulation of phytochemicals is dependent on water regime, harvesting time, and plant part; growers should consider 40-45% MAD and harvest seven to eight months after planting when growing ginger species to save the scarce resource (water), high phytochemical content and rhizome yield.en_US
dc.description.departmentPlant Production and Soil Scienceen_US
dc.description.embargo2023-07-17
dc.description.librarianhj2023en_US
dc.description.sponsorshipThe University of Pretoria (UP), National Research Foundation (NRF), Oppenheimer Memorial Trust (OMT), Agricultural Research Council (ARC), Vegetable Industrial Medicinal Plants (VIMP) and Fortuna Company.en_US
dc.description.urihttps://www.elsevier.com/locate/scihortien_US
dc.identifier.citationGatabazi, A., Marais, D., Steyn, M. et al. 2022, 'Effect of water regimes and harvest times on yield and phytochemical accumulation of two ginger species', Scientia Horticulturae, vol. 304, art. 111353, pp. 1-10. doi : 10.1016/j.scienta.2022.111353.en_US
dc.identifier.issn0304-4238 (print)
dc.identifier.issn1879-1018 (online)
dc.identifier.other10.1016/j.scienta.2022.111353
dc.identifier.urihttp://hdl.handle.net/2263/91386
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.rights© 2022 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Scientia Horticulturae. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Scientia Horticulturae, vol. 304, art. 111353, pp. 1-10. doi : 10.1016/j.scienta.2022.111353.en_US
dc.subjectCommercial ginger (Zingiber officinale Roscoe)en_US
dc.subjectAntioxidant activityen_US
dc.subjectFlavonoidsen_US
dc.subjectPhenolicsen_US
dc.subjectAfrican ginger (Siphonochilus aethiopicus (Schweinf.) BL Burtt)en_US
dc.subjectMaximum allowable depletion (MAD)en_US
dc.subjectRhizome yielden_US
dc.subjectWater use efficiencyen_US
dc.subjectMedicinal plantsen_US
dc.subjectSDG-06: Clean water and sanitationen_US
dc.subjectSDG-15: Life on landen_US
dc.titleEffect of water regimes and harvest times on yield and phytochemical accumulation of two ginger speciesen_US
dc.typePostprint Articleen_US

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