MyNews24 is a user-generated section of The stories here come from users.

Jerry Rodrigues
Comments: 0
Article views: 1286
Latest Badges:

View all Jerry Rodrigues's badges.

The amazing Cabernet franc

04 May 2016, 07:44

The amazing Cabernet franc...
DNA sequence analysis performed on the oldest South African grapevine rootstock cultivar has now revealed that the long sought-after identity of its Vitis vinifera parent could be the ancient European cultivar, Cabernet franc! This is very good news for grapevine breeders in the future if they want to produce a good South African disease-resistant grapevine variety. Its disease-resistance qualities are derived from its other parent, a North American 'wild' Vitis species called Vitis aestivalis or 'the Summer grape'.

The Jacquez grapevine has had a colourful history (since the phylloxera outbreak). It is a red grapevine cultivar that has been used literally for centuries as both a wine grape (so-called direct-producer) as well as a fairly successful rootstock that saved many a vineyard from the initial ravages of the mildew diseases and later the phylloxera in both Europe and America. The European viticultural industry was eventaully saved from the root-sucking phylloxera insect by grafting vinifera varieties onto American hybrid rootstocks such as Jacquez and others which were 'immune' to that insect. 

We now have 'evidence' that Jacquez was naturally generated from hybridization events involving the Vitis vinifera cultivar, Cabernet franc, with a 'wild' Vitis aestivalis grapevine species that took place at some point in early colonial America (around the middle of the 18th century). One possible reason why Cabernet franc was more successful than other European cultivars in growing reasonably successfully at that time in the eastern American colonies could be because it is one of the most cold-hardy Vitis vinifera varieties known. This fact most likely played an important 'role' in that region that resulted in the eventaul hybridization event that gave rise to the 'amazing' Jacquez cultivar.

However, the Madeira Islands (Portuguese archipelago in the north Atlantic Ocean) played an equally important pivotal role in the propagation and dissemination of this early rootstock to the New World (e.g. America, South Africa and Australia).Although we suspect that the Jacquez (also known as Black Spanish or Lenoir) cultivar was rescued by some early French or Portuguese settlers in America (either from South Carolina or Georgia), Americans were, initially, not aware of the importance of Jacquez in combating the aforementioned ravages to the European vineyards. The result was that Jacquez was brought to the Madeira islands by some settlers returning to Europe due to their dissatisfaction with the viticultural failures in those Eastern American colonies. The rest of the story is history...the European viticultural industry was 
well on its way to being rescued...

Aside from the fact that 'Jacquez' was one of the first 'natural' direct-producers (bearing varieties) to have been used on European soil (because of its relatively 'good' resistance to the mildews), even today, some 150 years later after the outbreak of the 

phylloxera epidemic in Europe, Jacquez and other hybrid rootstocks containing Jacquez 'genes' have been successfully used in South Africa and elsewhere, supplementing the rootstock arsenal in the fight against the phylloxera pest which has never really permanently left our vineyards.

All this drama...thanks to Cabernet franc!
by Dr Jerry Rodrigues (May, 2016)

Disclaimer: All articles and letters published on MyNews24 have been independently written by members of News24's community. The views of users published on News24 are therefore their own and do not necessarily represent the views of News24. News24 editors also reserve the right to edit or delete any and all comments received.


Read more from our Users

Submitted by
Thandisizwe Mgudlwa
Don't take Zuma's accusations lig...

Zuma's accusations that two of his comrades Ngoako Ramatlhodi and Siphiwe Nyanda, among others, were agents of the apartheid regime, hence they want to destroy him, can not be taken lightly. Read more...

0 comments 3702 views
Submitted by
Submitted by
LETTER: Zuma's testimony meant to...

I would have rather not allowed Jacob Zuma to derail the focus of the country and the movement away from mandate of the Zondo commission of inquiry because that is precisely what his outburst is intended to achieve.  Read more...

0 comments 670 views
Submitted by
Thandisizwe Mgudlwa
Ramaphosa doomsayers' criticism p...

It may be naive to seek to predict what the outcome of a nation's leader would turn out to be. South Africa's sixth administration is still coming out of the starting blocks. Read more...

0 comments 1380 views
Submitted by
An exodus of talent caused by cor...

When the country sees the very top of the pile getting away with blatant corruption it is little wonder why crime flourishes. Read more...

0 comments 2954 views
Submitted by
Patient abuse: Sharing content mu...

It is extremely easy, taking a mere split-second to share a video, but pre-sharing it, it is the duty and responsibility of the sharer to ethically deem whether the to-be shared content is an infringement on the basic privacy rights of the subject within the video.  Read more...

0 comments 697 views


Press Code We subscribe to the Press Code.

E-mail Newsletters You choose what you want

News24 on Android Get the latest from News24 on your Android device.

Terms and Conditions Terms and Conditions - Updated April 2012

Interactive Advertising Bureau
© 2019 All rights reserved.
There are new stories on the homepage. Click here to see them.


Create Profile

Creating your profile will enable you to submit photos and stories to get published on News24.

Please provide a username for your profile page:

This username must be unique, cannot be edited and will be used in the URL to your profile page across the entire network.


Location Settings

News24 allows you to edit the display of certain components based on a location. If you wish to personalise the page based on your preferences, please select a location for each component and click "Submit" in order for the changes to take affect.

Facebook Sign-In

Hi News addict,

Join the News24 Community to be involved in breaking the news.

Log in with Facebook to comment and personalise news, weather and listings.