CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Crop & Pasture Science   
Crop & Pasture Science
Journal Banner
  Plant Sciences, Sustainable Farming Systems & Food Quality
 
blank image Search
 
blank image blank image
blank image
 
  Advanced Search
   

Journal Home
About the Journal
Editorial Board
Contacts
Content
Online Early
Current Issue
Just Accepted
All Issues
Special Issues
Research Fronts
Farrer Reviews
Sample Issue
For Authors
General Information
Notice to Authors
Submit Article
Open Access
For Referees
Referee Guidelines
Review an Article
Annual Referee Index
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter youtube

red arrow Farrer Reviews
blank image

Invited Farrer Review Series. More...


red arrow PrometheusWiki
blank image
PrometheusWiki
Protocols in ecological and environmental plant physiology

 

Article << Previous     |     Next >>   Contents Vol 58(6)

Avirulence proteins of rust fungi: penetrating the host–haustorium barrier

Peter N. Dodds A B, Ann-Maree Catanzariti A, Greg J. Lawrence A, Jeffrey G. Ellis A

A CSIRO-Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia.
B Corresponding author. Email: peter.dodds@csiro.au
 
PDF (177 KB) $25
 Export Citation
 Print
  


Abstract

The continued deployment of resistance genes in Australian wheat varieties plays a crucial role in the prevention of crop losses as a result of rust infection. Resistance genes in plants act as an immune system by recognising specific components of the rust pathogen, encoded by avirulence (Avr) genes, and initiating defence responses. Recent advances in the model rust species, Melampsora lini, which infects cultivated flax (Linum usitatissimum), has led to the identification of several avirulence genes. These encode secreted proteins that are expressed in haustoria, specialised rust structures that penetrate the host cell wall. The AvrL567, AvrM, AvrP4, and AvrP123 proteins are recognised when expressed intracellularly in resistant plants, and the AvrL567 proteins interact directly with the corresponding L5 and L6 cytoplasmic resistance proteins. These observations imply that rusts deliver a range of small effector proteins directly into the plant cytoplasm, which are likely to perform key functions in facilitating pathogen infection. The plants’ resistance protein system has evolved to recognise the presence of these effectors during infection. Selection imposed by host resistance genes has led to the diversification of flax rust Avr genes to escape recognition. Nevertheless, virulent strains of flax rust retain variant forms of the Avr genes, suggesting that they have a positive fitness value to the pathogen. This knowledge is now being applied to develop screens for avirulence and pathogenicity-related proteins from important rust pathogens of wheat.

   
Subscriber Login
Username:
Password:  

    
Legal & Privacy | Contact Us | Help

CSIRO

© CSIRO 1996-2015