Research on the meaning of the enzymatic systems (GPI and PGM) as parameters for the definition of varieties (<i>Vitis</i> sp.): The Italian case of Cabernet franc

Authors

  • A. Calo
  • A. Costacurta
  • R. Di Stefano
  • G. Calo
  • G. Paludetti

DOI:

https://doi.org/10.5073/vitis.1990.29.special-issue.5-23

Keywords:

variety of vine, biotype, Italy, ampelography, biometry, analysis, morphology, leaf, berry, enzyme, pyrazine, polyphenol, phenol

Abstract

Several studies carried out at Davis and Conegliano showed that isozyme analysis of the GPI and PGM enzymatic systems agrees with the conventional definition of the variety in ampelography. Differences were reported among varieties but not among biotypes of the same varieties. The only exception recorded was in the population of Cabernet franc in which GPI and PGM reveal two different types (A - the traditional type encountered in France and B - type encountered in the Italian region of Veneto). Further ampelographic, ampelometric, phenological and chemical studies on the polyphenolic and aromatic substances in fruits have shown considerable differences between the two types. Such differences demonstrate that the type B is a different variety and not a clone of Cabernet franc. Preliminary ampelographic analysis and the equality in GPI and PGM patterns lead to the conclusion that the type B very probably is Carmenère.
Therefore, the hypothesis of variety discrimination based on the analysis of GPI and PGM is valid and this method is useful to help to characterize the varieties.

Downloads

Published

2015-10-27

Issue

Vol. 29 (1990): Vitis (Special Issue)

Section

Section 1: Genetic resources, evaluation and screening

License

The content of VITIS is published under a Creative Commons Attribution 4.0 license. Any user is free to share and adapt (remix, transform, build upon) the content as long as the original publication is attributed (authors, title, year, journal, issue, pages) and any changes to the original are clearly labeled. We do not prohibit or charge a fee for reuse of published content. The use of general descriptive names, trade names, trademarks, and so forth in any publication herein, even if not specifically indicated, does not imply that these names are not protected by the relevant laws and regulations. The submitting author agrees to these terms on behalf of all co-authors when submitting a manuscript. Please be aware that this license cannot be revoked. All authors retain the copyright on their work and are able to enter into separate, additional contractual arrangements.