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Thus, innovative strategies have been explored to improve crop tolerance to drought. This work focused on one natural peptide (PpT-2) with antioxidant activity, unexplored in plant applications, to evaluate its effectiveness in mitigating drought effect on <jats:italic>Solanum lycopersicum<\/jats:italic> L. plants. For that, tomato plants were foliar sprayed with different doses of PpT-2 (0, 15 or 150\u00a0mg L<jats:sup>\u22121<\/jats:sup>) and exposed to water Stressed and UnStressed conditions. The plant growth, photosynthesis and oxidative stress-related parameters were evaluated. Plant treatment with PpT-2, mostly at the highest concentration, alleviated diverse effects induced by water restriction: stimulated CO<jats:sub>2<\/jats:sub> assimilation; improved \u03a6<jats:sub>PSII<\/jats:sub>, Fv\/Fm and Fv\u2019\/Fm\u2019; amended net CO<jats:sub>2<\/jats:sub> assimilation rate and water use efficiency; restricted H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> accumulation and lipid peroxidation; stimulated SOD activity. Under UnStressed conditions, PpT-2 induced some degree of stomatal closure, nevertheless without restricting CO<jats:sub>2<\/jats:sub> availability for the non-photochemical processes of photosynthesis, besides of decreasing H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> content and CAT activity. Overall, PpT-2 application controlled H<jats:sub>2<\/jats:sub>O<jats:sub>2<\/jats:sub> accumulation, and under water limitations improved both photochemical and non-photochemical processes of photosynthesis and promoted drought tolerance, underscoring its potential for managing drought stress in crop species.<\/jats:p>","DOI":"10.1007\/s00344-024-11569-4","type":"journal-article","created":{"date-parts":[[2024,11,20]],"date-time":"2024-11-20T18:00:36Z","timestamp":1732125636000},"page":"2569-2582","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Bioprospecting a Natural Antioxidant Peptide for Tomato Biostimulation Under Water Limitations: Physiological Approach"],"prefix":"10.1007","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1291-2667","authenticated-orcid":false,"given":"S\u00f3nia","family":"Silva","sequence":"first","affiliation":[]},{"given":"C\u00e1tia","family":"Teixeira","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3083-6218","authenticated-orcid":false,"given":"Maria Celeste","family":"Dias","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8500-7364","authenticated-orcid":false,"given":"Renato B.","family":"Pereira","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6018-4724","authenticated-orcid":false,"given":"Paula","family":"Gomes","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2861-8286","authenticated-orcid":false,"given":"Artur M. 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