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Article

Bark Extract of Uncaria tomentosa L. for the Control of Strawberry Phytopathogens †

1
Department of Agricultural and Forestry Engineering, ETSIIAA, Universidad de Valladolid, 34004 Palencia, Spain
2
Instituto Universitario de Investigación en Ciencias Ambientales de Aragón (IUCA), EPS, Universidad de Zaragoza, Carretera de Cuarte, s/n, 22071 Huesca, Spain
3
Centre of Molecular and Environmental Biology (CBMA), Department of Biology, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
4
Department of Agricultural, Forest and Environmental Systems, Agrifood Research and Technology Centre of Aragón, Instituto Agroalimentario de Aragón—IA2 (CITA-Universidad de Zaragoza), Avda. Montañana 930, 50059 Zaragoza, Spain
*
Author to whom correspondence should be addressed.
In Memoriam of Prof. Manuel Berrocal del Brío (16 March 2021).
Academic Editors: Jelena Popović-Djordjević and Luiz Fernando Cappa de Oliveira
Horticulturae 2022, 8(8), 672; https://doi.org/10.3390/horticulturae8080672
Received: 10 July 2022 / Revised: 20 July 2022 / Accepted: 21 July 2022 / Published: 23 July 2022
Gray mold (Botrytis cinerea Pers.), crown and fruit rot (Phytophthora cactorum (Lebert and Cohn) J.Schröt), and verticillium wilt (Verticillium dahliae Kleb.) are among the main diseases that affect the strawberry crop. In the study presented herein, the bark extract of Uncaria tomentosa (Willd. ex Schult.) DC, popularly known as “cat’s claw”, has been evaluated for its capability to act as a sustainable control method. The bioactive compounds present in the aqueous ammonia extract were characterized by gas chromatography–mass spectroscopy, and the antimicrobial activity of the extract—alone and in combination with chitosan oligomers (COS)—was assessed in vitro and as a coating for postharvest treatment during storage. Octyl isobutyrate (30.7%), 19α methyl-2-oxoformosanan-16-carboxylate (9.3%), tetrahydro-2-methyl-thiophene (4.7%), and α-methyl manofuranoside (4.4%) were identified as the main phytoconstituents. The results of in vitro growth inhibition tests showed that, upon conjugation of the bark extract with COS, complete inhibition was reached at concentrations in the 39–93.75 μg∙mL−1 range, depending on the pathogen. Concerning the effect of the treatment as a coating to prolong the storage life and control decay during post-harvest storage, high protection was observed at a concentration of 1000 μg∙mL−1. Because of this effectiveness, higher than that attained with conventional synthetic fungicides, the bark extracts of cat’s claw may hold promise for strawberry crop protection. View Full-Text
Keywords: cat’s claw; chitosan oligomers; coating; crown rot; GC–MS; gray mold; leather rot; postharvest; verticillium wilt cat’s claw; chitosan oligomers; coating; crown rot; GC–MS; gray mold; leather rot; postharvest; verticillium wilt
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MDPI and ACS Style

Sánchez-Hernández, E.; Martín-Ramos, P.; Martín-Gil, J.; Santiago-Aliste, A.; Hernández-Navarro, S.; Oliveira, R.; González-García, V. Bark Extract of Uncaria tomentosa L. for the Control of Strawberry Phytopathogens. Horticulturae 2022, 8, 672. https://doi.org/10.3390/horticulturae8080672

AMA Style

Sánchez-Hernández E, Martín-Ramos P, Martín-Gil J, Santiago-Aliste A, Hernández-Navarro S, Oliveira R, González-García V. Bark Extract of Uncaria tomentosa L. for the Control of Strawberry Phytopathogens. Horticulturae. 2022; 8(8):672. https://doi.org/10.3390/horticulturae8080672

Chicago/Turabian Style

Sánchez-Hernández, Eva, Pablo Martín-Ramos, Jesús Martín-Gil, Alberto Santiago-Aliste, Salvador Hernández-Navarro, Rui Oliveira, and Vicente González-García. 2022. "Bark Extract of Uncaria tomentosa L. for the Control of Strawberry Phytopathogens" Horticulturae 8, no. 8: 672. https://doi.org/10.3390/horticulturae8080672

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