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p. 239-241

Identification of molecular markers associated with partial resistance to powdery mildew, leaf rust and stripe rust in bread wheat line Saar

Lillemo M., Bjørnstad A., Asalf B., Singh R.P., Huerta-Espino J., Chen X.M., He Z.H.

The CIMMYT bread wheat line Saar has a high level of partial resistance to powdery mildew (PM), leaf rust (LR) and stripe rust (YR). Saar is known to carry Lr34/Yr18, and experiments were set up to test whether the same genetic factor could also be involved in the resistance to PM. A population of 113 recombinant inbred F6 lines from a cross between Saar and the susceptible line Avocet-YrA was tested for LR and YR in Mexico and PM in Norway and China. There was a strong association among the disease scores, and they were all strongly correlated with leaf tip necrosis (LTN). A bulked segregant analysis with SSR markers was conducted to identify molecular markers associated with the resistance to PM. Two major QTLs were identified, one on chromosome 7D and the other on chromosome 1B, corresponding to the adult plant rust resistance loci Lr34/Yr18 and Lr46/Yr29, respectively.

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Mots-clés

BLE TENDRE, LOCUS DES CARACTERES QUANTITATIFS, MARQUEUR GENETIQUE, RESISTANCE AUX MALADIES, RESISTANCE GENETIQUE, TRITICUM AESTIVUM

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Lillemo M., Bjørnstad A., Asalf B., Singh R.P., Huerta-Espino J., Chen X.M., He Z.H. Identification of molecular markers associated with partial resistance to powdery mildew, leaf rust and stripe rust in bread wheat line Saar. In : Molina-Cano J.L. (ed.), Christou P. (ed.), Graner A. (ed.), Hammer K. (ed.), Jouve N. (ed.), Keller B. (ed.), Lasa J.M. (ed.), Powell W. (ed.), Royo C. (ed.), Shewry P. (ed.), Stanca A.M. (ed.). Cereal science and technology for feeding ten billion people: genomics era and beyond. Zaragoza : CIHEAM / IRTA, 2008. p. 239-241. (Options Méditerranéennes : Série A. Séminaires Méditerranéens; n. 81). Meeting of the Eucarpia Cereal Section, 2006/11/13-17, Lleida (Spain). http://om.ciheam.org/om/pdf/a81/00800850.pdf