Exogenous applied proline may enhance the tolerance of sweet sorghum (Sorghum bicolor (L.) Moench) under water deficit stress

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dc.contributor.authorTas, Timucin
dc.contributor.authorBabacan, Orkun
dc.contributor.authorIsik, Yahya
dc.contributor.authorGenc, Tulay Turgut
dc.contributor.authorGungor, Huseyin
dc.date.accessioned2026-07-01T11:39:15Z
dc.date.available2026-07-01T11:39:15Z
dc.date.issued2026
dc.departmentDüzce Üniversitesi
dc.description.abstractDrought is a major abiotic stress that threatens global food security by reducing crop yield and quality. Foliar application of osmoprotectants such as proline offers a promising means to mitigate drought-induced damage. This study examined the effects of exogenous proline (P0, P200, P400, and P600 mg.L-1), sorghum genotype, and their interaction on morphological, physiological, biochemical, forage quality, and microbial traits under different drought levels (I100, I75, I50, and I25). Proline application increased dry matter by over 100 % under medium to severe deficits and enhanced root dry weight by 90 % at 75 % water reduction. The strongest response occurred in chlorophyll content (SPAD), reflecting improved photosynthetic stability. Exogenous proline reduced leaf drying by 25 % and alleviated drought-related declines in forage quality, as evidenced by improvements in NDF, ADF, and ADL. It also boosted peroxidase activity more than superoxide dismutase and catalase, minimizing hydrogen peroxide (H2O2) toxicity and oxidative stress. Even under extreme drought (I25), proline maintained plant vigor and improved water-use efficiency by 25-40 % at the seedling stage. Compared with the control, leaf chlorophyll content (SPAD values) decreased by 13.91 %, 24.28 %, and 31.85 % under the I75, I50, and I25 treatments, respectively, suggesting that SPAD measurements at the seedling stage may serve as a practical and cost-effective indicator for identifying drought-tolerant sorghum genotypes.
dc.identifier.doi10.47280/RevFacAgron(LUZ).v43.n1.X
dc.identifier.issn0378-7818
dc.identifier.issn2477-9407
dc.identifier.issue1
dc.identifier.scopus2-s2.0-105029168576
dc.identifier.scopusqualityQ4
dc.identifier.urihttps://doi.org/10.47280/RevFacAgron(LUZ).v43.n1.X
dc.identifier.urihttps://hdl.handle.net/20.500.12684/23193
dc.identifier.volume43
dc.identifier.wosWOS:001682191000001
dc.identifier.wosqualityQ4
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherUniv Zulia, Facultad Agronomia
dc.relation.ispartofRevista de la Facultad de Agronomia de la Universidad Del Zulia
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WOS_20260623
dc.subject[Keyword Not Available]
dc.titleExogenous applied proline may enhance the tolerance of sweet sorghum (Sorghum bicolor (L.) Moench) under water deficit stress
dc.typeArticle

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