z-logo
open-access-imgOpen Access
Identification and Molecular Characterization of Leaf Rust Resistance Gene Lr14a in Durum Wheat
Author(s) -
Sybil A. Herrera-Foessel,
Ravi P. Singh,
Julio Huerta Espino,
H. M. William,
Valéria Augusta García,
Annika Djurle,
Jonathan Yuen
Publication year - 2008
Publication title -
plant disease
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.663
H-Index - 108
eISSN - 1943-7692
pISSN - 0191-2917
DOI - 10.1094/pdis-92-3-0469
Subject(s) - biology , bulked segregant analysis , common wheat , rust (programming language) , amplified fragment length polymorphism , plant disease resistance , gene , agronomy , botany , genetics , chromosome , population , gene mapping , demography , sociology , computer science , genetic diversity , programming language
Leaf rust, caused by Puccinia triticina, is an important disease of durum wheat (Triticum turgidum subsp. durum) and only a few designated resistance genes are known to occur in this crop. A dominant leaf rust resistance gene in the Chilean durum cv. Llareta INIA was mapped to chromosome arm 7BL through bulked segregant analysis using the amplified fragment length polymorphism (AFLP) technique, and by mapping three polymorphic markers in the common wheat (T. aestivum) International Triticeae Mapping Initiative population. Several simple sequence repeat (SSR) markers, including Xgwm344-7B and Xgwm146-7B, were associated with the leaf rust resistance gene. Resistance response and chromosomal position indicated that this gene is likely to be Lr14a. The SSR markers Xgwm344-7B and Xgwm146-7B and one AFLP marker also differentiated common wheat cv. Thatcher from the near-isogenic line with Lr14a, as well as durum ‘Altar C84’ from durum wheat with Lr14a. This is the first report of the presence of Lr14a in durum wheat, although the gene originally was transferred from emmer wheat ‘Yaroslav’ to common wheat. Lr14a is also present in CIMMYT-derived durum ‘Somateria’ and effective against Mexican and other P. triticina races of durum origin. Lr14a should be deployed in combination with other effective leaf rust resistance genes to prolong its effectiveness in durum wheat.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here