Bioprospecting a Natural Antioxidant Peptide for Tomato Biostimulation Under Water Limitations: Physiological Approach

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Silva, S (Author) Other; Catia Teixeira (Author) FCUP; Dias, MC (Author) Other; Pereira, RB (Author) Other; Paula Gomes (Author) FCUP; Silva, AMS (Author) Other

Journal

The Journal is awaiting validation by the Administrative Services.

Title: JOURNAL OF PLANT GROWTH REGULATION

ISSN: 0721-7595

Indexing

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Other information

Authenticus ID: P-017-EB3

DOI: 10.1007/s00344-024-11569-4

Abstract (EN): Drought causes major agricultural losses, threatening food security worldwide. 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 Solanum lycopersicum L. plants. For that, tomato plants were foliar sprayed with different doses of PpT-2 (0, 15 or 150 mg L-1) 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 CO2 assimilation; improved Phi PSII, Fv/Fm and Fv'/Fm'; amended net CO2 assimilation rate and water use efficiency; restricted H2O2 accumulation and lipid peroxidation; stimulated SOD activity. Under UnStressed conditions, PpT-2 induced some degree of stomatal closure, nevertheless without restricting CO2 availability for the non-photochemical processes of photosynthesis, besides of decreasing H2O2 content and CAT activity. Overall, PpT-2 application controlled H2O2 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14