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United States Department of Agriculture

Agricultural Research Service

Title: Apparently Unique Resistances in Durum Wheats to Durum Wheat Left Rust

Authors
item Mishra, Akhilesh - UNIVERSITY OF MINNESOTA
item Roelfs, Alan

Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 16, 1995
Publication Date: N/A

Technical Abstract: A total of 22 durum wheats, mostly land races from around the world, were tested as seedlings with 191 durum wheat leaf rust isolates from 11 countries. 'Immer' was resistant to all the isolates with usually a '0;1=' infection type (IT). 'Arabian durum', 'Local Red', 'RL 6089', and 'Karkov' were susceptible to most isolates while the other lines responded as differentials. The resistance response of 'Arendeto', 'Mocha de Espiga Branca', and 'Rojal de Almeria' was characterized by a 'Y' IT (a more compatible response near the leaf tip compared with the leaf base). However, 'Rojal de Almeria' displayed marked necrosis in the lower and middle parts of the leaf. The low IT was generally a 'Z' (pattern opposite of 'Y' with greater compatibility towards the leaf base) in case of 'Kubanka' and 'Acme'. Other lines exhibited a range of ITs from ';1' through 'X' with fairly common 'Z' and 'Y' tendencies. Several isolates that were virulent on most of the durum test lines were avirulent on 'Thatcher' or many of its isolines carrying singly known Lr genes. These observations indicate the presence of apparently unique resistance in the durum wheat and apparently unique virulence in the durum wheat leaf rust pathogen.

Last Modified: 7/28/2014
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