Identification of genes for resistance to a Digitaria isolate of Magnaporthe grisea in common wheat cultivars

Genome Génome / Conseil National De Recherches Canada
Nguyen Thi Thanh NgaY Tosa

Abstract

Common wheat cultivars are resistant to Magnaporthe grisea, a crabgrass (Digitaria sanguinalis)-specific species of the blast fungus. To dissect the genetic basis of this "nonhost" type of resistance, we need an exceptional cultivar that is susceptible to M. grisea. A screening under various conditions revealed that Triticum aestivum 'Chinese Spring' (CS) was susceptible to M. grisea isolate Dig41 when incubated at high temperature (26 degrees C) after inoculation. By contrast, T. aestivum 'P168', 'Shin-chunaga' (Sch), 'Norin 4' (N4), 'Norin 26' (N26), 'Norin 29' (N29), 'Red Egyptian' (RE), and 'Salmon' (Slm) and Triticum compactum 'No. 44' (Cmp) were highly resistant even at the high temperature. When F2 seedlings derived from crosses between the resistant cultivars and CS were inoculated with Dig41, they segregated in a 3:1 ratio of resistant to susceptible, suggesting that the resistance of each cultivar is controlled by one major gene. Crosses of N4 with P168, Sch, N26, N29, and Cmp yielded no susceptible F2 seedlings, suggesting that these six cultivars share the same gene. Similarly, a cross between RE and Slm yielded no susceptible F2 seedlings, suggesting that these two cultivars share the same gene. On the other hand, ...Continue Reading

References

Jul 28, 2007·Mycological Research·Kenji HirataYukio Tosa
Mar 22, 2008·Genome Génome / Conseil National De Recherches Canada·S W ZhanY Tosa
Jan 14, 2009·The New Phytologist·Odile Faivre-RampantPietro Piffanelli

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Citations

Apr 20, 2010·Journal of Bioinformatics and Computational Biology·Artem Sokolov, Asa Ben-Hur
Oct 24, 2014·Chemical Reviews·David S Barnett, R Kiplin Guy
Jun 15, 2016·Annual Review of Phytopathology·Ravi P SinghJulio Huerta-Espino
Jun 4, 2020·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Xinyao HePawan K Singh
Mar 5, 2019·The Plant Pathology Journal·M Tofazzal IslamJaehyuk Choi
Aug 10, 2021·Frontiers in Plant Science·Pawan K SinghAakash Chawade
May 11, 2019·Current Opinion in Plant Biology·Michael Ayliffe, Chris K Sørensen

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