Featured Research

from universities, journals, and other organizations

Resistance Genes Discovered In Ancestral Tomato Species

Date:
October 12, 2004
Source:
Netherlands Organization For Scientific Research
Summary:
Dutch researcher Marco Kruijt has discovered two resistance genes that were probably present in an ancestral tomato species, prior to the evolution of modern tomato species. The phytopathologist found these same two genes, which provide resistance against a certain fungus, in several wild tomato species.

Dutch researcher Marco Kruijt has discovered two resistance genes that were probably present in an ancestral tomato species, prior to the evolution of modern tomato species. The phytopathologist found these same two genes, which provide resistance against a certain fungus, in several wild tomato species.

Tomatoes resistant to the fungus Cladosporium fulvum possess the so-called Cf resistance genes. Kruijt investigated the evolution of these genes in wild tomato species. The researcher managed to demonstrate that a number of these Cf resistance genes were already present in an ancestral tomato species. In all probability, the fungus C. fulvum was already a pathogen of this ancestral tomato species, and therefore the resistance genes Cf-4 and Cf-9 have been retained in the various modern wild tomato species.

The researcher also discovered that wild plants on which the Peruvian or berry tomatoes grow contain not one but three resistance genes, all of which recognise the same fungal factor. These three genes are the result of a series of changes that have led to complete pieces of DNA being duplicated.

Kruijt also demonstrated that DNA exchange between the various Cf genes has led to a new Cf resistance gene.

Cladosporium fulvum causes a fungal disease in tomato plants. Wild tomato species contain many resistance genes against this fungus. In particular, the Cf-9 gene from the wild berry tomato Lycopersicon pimpinellifolium is frequently used in commercial tomato varieties. Each of the Cf resistance genes recognises a different product from the fungus and this recognition in the tomato leaf causes a number of cells around the fungus to die. This 'scorched earth tactic' ensures that the fungus cannot infect the rest of the plant.

The research was funded by the Netherlands Organisation for Scientific Research.


Story Source:

The above story is based on materials provided by Netherlands Organization For Scientific Research. Note: Materials may be edited for content and length.


Cite This Page:

Netherlands Organization For Scientific Research. "Resistance Genes Discovered In Ancestral Tomato Species." ScienceDaily. ScienceDaily, 12 October 2004. <www.sciencedaily.com/releases/2004/10/041012084358.htm>.
Netherlands Organization For Scientific Research. (2004, October 12). Resistance Genes Discovered In Ancestral Tomato Species. ScienceDaily. Retrieved August 30, 2014 from www.sciencedaily.com/releases/2004/10/041012084358.htm
Netherlands Organization For Scientific Research. "Resistance Genes Discovered In Ancestral Tomato Species." ScienceDaily. www.sciencedaily.com/releases/2004/10/041012084358.htm (accessed August 30, 2014).

Share This




More Plants & Animals News

Saturday, August 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Killer Amoeba Found in Louisiana Water System

Killer Amoeba Found in Louisiana Water System

AP (Aug. 28, 2014) — State health officials say testing has confirmed the presence of a killer amoeba in a water system serving three St. John the Baptist Parish towns. (Aug. 28) Video provided by AP
Powered by NewsLook.com
Raw: Australian Sheep Gets Long Overdue Haircut

Raw: Australian Sheep Gets Long Overdue Haircut

AP (Aug. 28, 2014) — Hoping to break the record for world's wooliest, Shaun the sheep came up 10 pounds shy with his fleece weighing over 50 pounds after being shorn for the first time in years. (Aug. 28) Video provided by AP
Powered by NewsLook.com
Minds Blown: Scientists Develop Fish That Walk On Land

Minds Blown: Scientists Develop Fish That Walk On Land

Newsy (Aug. 28, 2014) — Canadian scientists looking into the very first land animals took a fish out of water and forced it to walk. Video provided by Newsy
Powered by NewsLook.com
Huge Ancient Wine Cellar Found In Israel

Huge Ancient Wine Cellar Found In Israel

Newsy (Aug. 28, 2014) — An international team uncovered a large ancient wine celler that likely belonged to a Cannonite ruler. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins