NDLI: Significance of PWT4–Rwt4 interaction in the species specificity of Avena isolates of Magnaporthe oryzae on wheat

Content Provider	Springer Nature Link
Author	Hirata, Kenji Tosa, Yukio Nakayashiki, Hitoshi Mayama, Shigeyuki
Copyright Year	2005
Abstract	We examined whether PWT4, an avirulence gene of Avena isolates of Magnaporthe oryzae toward wheat, corresponded to Rwt4, a resistance gene identified in wheat cultivar Norin 4, in a one-to-one manner. Twelve wheat cultivars were inoculated with 65X1, an F1 culture with PWT4 derived from a cross between an Avena isolate (Br58) and a Triticum isolate (Br48). Three wheat cultivars (Norin 26, Shin-chunaga, Cheyenne) were resistant and therefore selected as possible carriers of Rwt4. The three cultivars were then inoculated with a population derived from a backcross of 61M2 carrying PWT4 with Br48 carrying pwt4. Segregation analyses revealed that PWT4 operates against the three cultivars. If PWT4 corresponds to Rwt4 in a one-to-one manner, all three cultivars should carry Rwt4. To test if this is the case, the three cultivars were crossed with Chinese Spring (a noncarrier of Rwt4) and Norin 4. When F2 seedlings from Chinese Spring × Norin 26, Chinese Spring × Shin-chunaga, and Chinese Spring × Cheyenne were inoculated with 61M2, resistant and susceptible seedlings segregated in a 3 : 1 ratio. On the other hand, crosses between the three cultivars and Norin 4 yielded no susceptible F2 seedlings. These results indicate that all three cultivars carry Rwt4. Considering all results, we concluded that PWT4 corresponds to Rwt4 in a one-to-one manner. An inoculation test with Chinese Spring–Cheyenne chromosome substitution lines indicated that Rwt4 is located on chromosome 1D.
Starting Page	340
Ending Page	344
Page Count	5
File Format	PDF
ISSN	13452630
Journal	Journal of General Plant Pathology
Volume Number	71
Issue Number	5
e-ISSN	1610739X
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-10-05
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Magnaporthe oryzae Pyricularia oryzae Wheat Oat Gene-for-gene Agriculture Microbiology Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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