A New Resistance Gene in Combination with Rmg8 Confers Strong Resistance Against Triticum Isolates of Pyricularia oryzae in a Common Wheat Landrace

Phytopathology
Shizhen WangYukio Tosa

Abstract

The wheat blast fungus (Triticum pathotype of Pyricularia oryzae) first arose in Brazil in 1985 and has recently spread to Asia. Resistance genes against this new pathogen are very rare in common wheat populations. We screened 520 local landraces of common wheat collected worldwide with Br48, a Triticum isolate collected in Brazil, and found a highly resistant, unique accession, GR119. When F2 seedlings derived from a cross between GR119 and Chinese Spring (CS, susceptible control) were inoculated with Br48, resistant and susceptible seedlings segregated in a 15:1 ratio, suggesting that GR119 carries two resistance genes. When the F2 seedlings were inoculated with Br48ΔA8 carrying a disrupted allele of AVR-Rmg8 (an avirulence gene corresponding to a previously reported resistance gene, Rmg8), however, the segregation fitted a 3:1 ratio. These results suggest that one of the two genes in GR119 was Rmg8. The other, new gene was tentatively designated as RmgGR119. GR119 was highly resistant to all Triticum isolates tested. Spikes of GR119 were highly resistant to Br48, moderately resistant to Br48ΔA8 and a hybrid culture carrying avr-Rmg8 (nonfunctional allele), and highly resistant to its transformant carrying AVR-Rmg8. The stron...Continue Reading

References

Dec 16, 2005·Molecular Plant-microbe Interactions : MPMI·Yukio TosaSally A Leong
Mar 22, 2008·Genome Génome / Conseil National De Recherches Canada·S W ZhanY Tosa
Apr 21, 2012·Briefings in Bioinformatics·Helga ThorvaldsdóttirJill P Mesirov
Jul 20, 2016·IMA Fungus·Ning ZhangJin-Rong Xu

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Citations

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
Jul 6, 2021·Frontiers in Plant Science·Mariela Fernández-CamposC D Cruz
Aug 10, 2021·Frontiers in Plant Science·Pawan K SinghAakash Chawade

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