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PLANT GENETIC RESOURCES

Effectiveness of Different Sources of Stem Rust Resistance in Barley

^a Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, MB, R3T 2M9 Canada
^b Research Centre, Agriculture and Agri-Food Canada, P.O. Box 1000A, R.R.#3, Brandon, MB, R7A 5Y3, Canada

dharder{at}em.agr.ca

Stem rust (Puccinia graminis Pers. f. sp. tritici Eriks. & Henn.) pathotype QCCJ is a potential threat to barley (Hordeum vulgare L.) production in North America. A field test was conducted for 3 yr to evaluate the effectiveness of several new sources of stem rust resistance to reduce losses. A randomized complete block design was used, with a split-plot arrangement of treated (propiconizole fungicide) and untreated plots. Nine lines used in the test were classed as resistant (R), moderately resistant (MR), moderately susceptible (MS), and susceptible (S). The yield losses in each group were: R—Q21861 (12%), QSM-041 (12%), BM8923-46 (12%); MR— `Diamond' (21%), SB90585 (26%); MS—`Robust' (30%), `Bonanza' (33%), `Harrington' (37%); S—`Klages' (53%). There were highly significant effects on 1000-kernel weight, test weight, and percentage kernel plumpness for all entries. The losses in kernel weight ranged from 7% (Q21861) to 43% (Klages), in test weight from 3% (Q21861) to 26% (Klages), and kernel plumpness from 5% (Q21861) to 95% (Klages). There were no significant effects of rust infection on plant height and days to heading. Effects on lodging were variable, and reduced days to maturity was highly significant for all entries. Lines with combinations of genes Rpg1/rpg4 (Q21861, Q/SM-041) and Rpg1/Rpg3 (BM8923-46) provided the highest levels of protection, with a somewhat lesser level provided by Rpg1/RpgU (Diamond). Combinations of these genes should provide effective stem rust resistance in barley breeding.

Abbreviations: AAFC, Agriculture & Agri-Food Canada • kw, 1000-kernel weight • MR, moderately resistant • MS, moderately susceptible • PGR, Plant Gene Resources of Canada • plump, percentage kernel plumpness • R, resistant • S, susceptible • tw, test weight

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