Efficient breeding strategy for wheat blast disease(Magnaporthe oryzae Triticum) resistance in Bolivia -­ use of the experience acquired on rice blast

Vales Michel, Huallpa C.B., Anzoategui T., Mostacedo B., Cazon Fernandez Maria Isabel. 2016. Efficient breeding strategy for wheat blast disease(Magnaporthe oryzae Triticum) resistance in Bolivia -­ use of the experience acquired on rice blast. In : Book of Abstracts 5th International Symposium on Fusarium Head Blight 2nd International Workshop on Wheat Blast. Medeiros Del Ponte Emerson (ed.), Carlton Bergstrom Gary (ed.), Pavan Willingthon (ed.), Lazzaretti Alexandre (ed.), Cunha Fernandes José Maurício (ed.). Florianópolis : Universidade de Passo Fundo, Résumé, p. 130. International Workshop on Wheat Blast. 2, Florianópolis, Brésil, 6 April 2016/9 April 2016.

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Abstract : Blast is the main wheat disease in Bolivia and to tackle it we are applying a breeding strategy, which has proven its efficacy for obtaining rice varieties with a high level of durable partial resistance to blast. Incomplete information is available on wheat blast resistance, so, firstly we base our strategy on the worst hypotheses. Next, the possible invalidation of every hypothesis can allow simplifying the breeding schema and its implementation. These successive or complementary hypotheses are the following: H01: The obtaining of a sufficient resistance is impossible; H02: Only a partial resistance with a low level is available; H03: The partial resistance is polygenic; H04: The partial resistance is little heritable; H05: The partial resistance is partly specific; H06 and H07: A complete resistance is obtained and is specific; H08: The disease resistance penalizes the yield. For every hypothesis, the consequences of its consideration, the study of its validity and the consequences of its possible invalidation are explained. Scientific arguments, references, and materials and methods details are provided. Briefly, these hypotheses lead 1) to the obtaining and to the cheapest multiplication of genetically pure blast-free seeds for blast-free cropping areas, 2) to the search of new resistance genes or new genetic backgrounds for the expression of such genes in core collections and in recurrent populations with a very broad genetic base, and 3) to the implementation of the participatory recurrent selection in populations with a narrow genetic base with the extraction of lines for providing the participatory creation of varieties. Every sub‑program, i.e., for obtaining new varieties for a specific set of agro‑ecological, socio-economical, industrial and commercial conditions and purposes, needs less than 1.000 m2. This own strategy is focused on the obtaining of adequate resistant varieties as fast as possible in the respect for the Bolivian scientific sovereignty, by a complementary approach of those of the other teams and by an application of the subsidiarity principle.

Auteurs et affiliations

  • Vales Michel, CIRAD-BIOS-UMR BGPI (BOL)
  • Huallpa C.B., INIAF (BOL)
  • Anzoategui T., Universidad Central del Ecuador (ECU)
  • Mostacedo B., Universidad Central del Ecuador (ECU)
  • Cazon Fernandez Maria Isabel, CIRAD-BIOS-UMR BGPI (FRA)

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