Pre-anthesis cytokinin applications increase table grape berry firmness by modulating cell wall polysaccharides

Bárbara Rojas, Felipe Suárez-Vega, Susana Saez-Aguayo, Patricio Olmedo, Baltasar Zepeda, Joaquín Delgado-Rioseco, Bruno G. Defilippi, Romina Pedreschi, Claudio Meneses, Alonso G. Pérez-Donoso*, Reinaldo Campos-Vargas*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)


The use of plant growth regulators (PGRs) is widespread in commercial table grape vine-yards. 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.

Original languageEnglish
Article number2642
Issue number12
Publication statusPublished - 1 Dec 2021


  • Cell wall
  • CPPU
  • Cytokinin
  • Pre-anthesis
  • Thompson Seedless
  • Vitis vinifera


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