Accumulation of genes for susceptibility to rust fungi for which barley is nearly a nonhost results in two barley lines with extreme multiple susceptibility
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Abstract
Nonhost resistance is the most common type of resistance in plants. Understanding the factors that make plants susceptible or resistant may help to achieve durably effective resistance in crop plants. Screening of 109 barley (Hordeum vulgare L.) accessions in the seedling stage indicated that barley is a complete nonhost to most of the heterologous rust fungi studied, while it showed an intermediate status with respect to Puccinia triticina, P. hordei-murini, P. hordei-secalini, P. graminis f. sp. lolii and P. coronata ff. spp. avenae and holci. Accessions that were susceptible to a heterologous rust in the seedling stage were much more or completely resistant at adult plant stage. Differential interaction between barley accessions and heterologous rust fungi was found, suggesting the existence of rust-species-specific resistance. In particular, many landrace accessions from Ethiopia and Asia, and naked-seeded accessions, tended to be susceptible to several heterologous rusts, suggesting that some resistance genes in barley are effective against more than one heterologous rust fungal species. Some barley accessions had race-specific resistance against P. hordei-murini. We accumulated genes for susceptibility to P. triticina and P. hordei-murini in two genotypes called SusPtrit and SusPmur, respectively. In the seedling stage, these accessions were as susceptible as the host species to the target rusts. They also showed unusual susceptibility to other heterologous rusts. These two lines are a valuable asset to further experimental work on the genetics of resistance to heterologous rust fungi.
Keywords
Hordeum Nonhost resistance Puccinia Rust fungiAbbreviations
- ff. spp
Formae speciales
- RIL
Recombinant inbred line
- DC
Double cross
- DC-S
Progeny produced by selfing of double-cross plants
Notes
Acknowledgements
S.G. Atienza and H. Jafary contributed equally to the work. We thank Anton Vels and Michel Hagendoorn for their skillful technical assistance. S.G. Atienza was supported by the Consejería de Educación y Ciencia of the Junta Andalucía (Spain) and the European Union. H. Jafary was supported by the Agricultural Research and Education Organisation (AREO) and Ministry of Science Research and Technology of I.R. of Iran. The isolate P. triticina Eriks. B9414-1cA3 was kindly provided by Dr. H. Goyeau, Lab. Pathologie Végétale, INRA, Thiverval-Grignon, France.
Supplementary material
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