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Article

Pre-Anthesis Cytokinin Applications Increase Table Grape Berry Firmness by Modulating Cell Wall Polysaccharides

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Centro de Estudios Postcosecha, Facultad de Ciencias Agronómicas, Universidad de Chile, Santiago 8831314, Chile
2
Centro de Biotecnología Vegetal, Facultad de Ciencias de la Vida, Universidad Andrés Bello, Santiago 8370186, Chile
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Departamento de Fruticultura y Enología, Facultad de Agronomía e Ingeniería Forestal, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
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Horticulture and Product Physiology, Department of Plant Sciences, Wageningen University, P.O. Box 16, 6700 AA Wageningen, The Netherlands
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INIA La Platina, Instituto de Investigaciones Agropecuarias, Santiago 8831314, Chile
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Escuela de Agronomía, Facultad de Ciencias Agronómicas y de los Alimentos, Pontificia Universidad Católica de Valparaíso, Quillota 2260000, Chile
*
Authors to whom correspondence should be addressed.
Academic Editor: Matthew Tucker
Plants 2021, 10(12), 2642; https://doi.org/10.3390/plants10122642
Received: 28 September 2021 / Revised: 22 November 2021 / Accepted: 29 November 2021 / Published: 1 December 2021
(This article belongs to the Special Issue Postharvest Physiology of Fruit and Vegetable)
The use of plant growth regulators (PGRs) is widespread in commercial table grape vineyards. The synthetic cytokinin CPPU is a PGR that is extensively used to obtain higher quality grapes. However, the effect of CPPU on berry firmness is not clear. The current study investigated the effects of pre-anthesis applications (BBCH15 and BBCH55 stages) of CPPU on ‘Thompson Seedless’ berry firmness at harvest through a combination of cytological, morphological, and biochemical analyses. Ovaries in CPPU-treated plants presented morphological changes related to cell division and cell wall modification at the anthesis stage (BBCH65). Moreover, immunofluorescence analysis with monoclonal antibodies 2F4 and LM15 against pectin and xyloglucan demonstrated that CPPU treatment resulted in cell wall modifications at anthesis. These early changes have major repercussions regarding the hemicellulose and pectin cell wall composition of mature fruits, and are associated with increased calcium content and a higher berry firmness at harvest. View Full-Text
Keywords: Vitis vinifera; pre-anthesis; cytokinin; CPPU; cell wall; Thompson Seedless Vitis vinifera; pre-anthesis; cytokinin; CPPU; cell wall; Thompson Seedless
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MDPI and ACS Style

Rojas, B.; Suárez-Vega, F.; Saez-Aguayo, S.; Olmedo, P.; Zepeda, B.; Delgado-Rioseco, J.; Defilippi, B.G.; Pedreschi, R.; Meneses, C.; Pérez-Donoso, A.G.; Campos-Vargas, R. Pre-Anthesis Cytokinin Applications Increase Table Grape Berry Firmness by Modulating Cell Wall Polysaccharides. Plants 2021, 10, 2642. https://doi.org/10.3390/plants10122642

AMA Style

Rojas B, Suárez-Vega F, Saez-Aguayo S, Olmedo P, Zepeda B, Delgado-Rioseco J, Defilippi BG, Pedreschi R, Meneses C, Pérez-Donoso AG, Campos-Vargas R. Pre-Anthesis Cytokinin Applications Increase Table Grape Berry Firmness by Modulating Cell Wall Polysaccharides. Plants. 2021; 10(12):2642. https://doi.org/10.3390/plants10122642

Chicago/Turabian Style

Rojas, Bárbara, Felipe Suárez-Vega, Susana Saez-Aguayo, Patricio Olmedo, Baltasar Zepeda, Joaquín Delgado-Rioseco, Bruno G. Defilippi, Romina Pedreschi, Claudio Meneses, Alonso G. Pérez-Donoso, and Reinaldo Campos-Vargas. 2021. "Pre-Anthesis Cytokinin Applications Increase Table Grape Berry Firmness by Modulating Cell Wall Polysaccharides" Plants 10, no. 12: 2642. https://doi.org/10.3390/plants10122642

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