The photosynthetic efficiency and carbohydrates responses of six edamame (Glycine max. L. Merrill) cultivars under drought stress

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dc.contributor.authorHlahla, Jeremiah M.
dc.contributor.authorMafa, Mpho S.
dc.contributor.authorVan der Merwe, Rouxlene
dc.contributor.authorAlexander, Orbett
dc.contributor.authorDuvenhage, Mart-Mari
dc.contributor.authorKemp, Gabre
dc.contributor.authorMoloi, Makoena J.
dc.date.accessioned2022-02-17T11:46:08Z
dc.date.available2022-02-17T11:46:08Z
dc.date.issued2022
dc.description.abstractVegetable-type soybean, also known as edamame, was recently introduced to South Africa. However, there is lack of information on its responses to drought. The aim of this study was to investigate the photosynthetic efficiency and carbohydrates responses of six edamame cultivars under drought stress. Photosynthetic efficiency parameters, including chlorophyll fluorescence and stomatal conductance, were determined using non-invasive methods, while pigments were quantified spectrophotometrically. Non-structural carbohydrates were quantified using Megazyme kits. Structural carbohydrates were determined using Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Drought stress significantly increased the Fv/Fm and PIabs of AGS429 and UVE17 at pod filling stage. Chlorophyll-a, which was most sensitive to drought, was significantly reduced in AGS429 and UVE17, but chlorophyll-b was relatively stable in all cultivars, except UVE17, which showed a significant decline at flowering stage. AGS354 and AGS429 also showed reduced chlorophyll-b at pod filling. UVE17 showed a significant reduction in carotenoid content and a substantial reduction in stomatal conductance during pod filling. Drought stress during pod filling resulted in a significant increase in the contents of trehalose, sucrose and starch, but glucose was decreased. Chlorophyll-a positively correlated with starch. The FTIR and XRD results suggest that the cell wall of UVE14, followed by UVE8 and AGS429, was the most intact during drought stress. It was concluded that carotenoids, stomatal conductance, starch and hemicellulose could be used as physiological/biochemical indicators of drought tolerance in edamame. This information expands our knowledge of the drought defense responses in edamame, and it is essential for the physiological and biochemical screening of drought tolerance.en_ZA
dc.description.versionPublisher's versionen_ZA
dc.identifierhttps://doi.org/10.3390/plants11030394
dc.identifier.citationHlahla, J.M., Mafa, M.S., Van der Merwe, R., Alexander, O., Duvenhage, M.-M., Kemp, G., & Moloi, M.J. (2022). The Photosynthetic Efficiency and Carbohydrates Responses of Six Edamame (Glycine max. L. Merrill) Cultivars under Drought Stress. Plants, 11, 394. https://doi.org/10.3390/ plants11030394en_ZA
dc.identifier.issn2223-7747
dc.identifier.urihttp://hdl.handle.net/11660/11431
dc.language.isoenen_ZA
dc.publisherMDPIen_ZA
dc.rights.holderAuthor(s)en_ZA
dc.rights.licensehttps://creativecommons.org/licenses/by/4.0/
dc.subjectCarbohydratesen_ZA
dc.subjectCarotenoidsen_ZA
dc.subjectDroughten_ZA
dc.subjectEdamameen_ZA
dc.subjectPhotosynthesisen_ZA
dc.subjectStomatal conductanceen_ZA
dc.subjectHemicelluloseen_ZA
dc.subjectLigninen_ZA
dc.titleThe photosynthetic efficiency and carbohydrates responses of six edamame (Glycine max. L. Merrill) cultivars under drought stressen_ZA
dc.typeArticleen_ZA
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