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  3. 2007

Designation and classification system for blast races using new international differential varieties, monogenic lines

Description

       A new systematic, expandable method that allows easy understanding of the relationships between races and resistance genes is proposed for building up an international standard designation and classification system for blast races. Blast races were characterized by their reactions to 26 LTH monogenic lines, targeting 23 resistance genes, which were divided into five groups, (1) LTH, IRBLa-A, IRBLsh-S, IRBLb-B, and IRBLt-K59, (2) 3 lines of Pii locus region, (3) 7 lines of Pik region, (4) 4 lines of Piz region, and (5) 7 lines of Pita region. Each group consists of 1 to 3 variety unit(s), which were allocated with 3 differential lines (genes) in each and applied codes, 1, 2, and 4, for compatible reactions of blast isolates, respectively. A blast race is characterized by the sum of codes in combinations of three varieties’ reactions in each unit with the Gilmour method. In the case of all compatible reactions to differential lines, the race No. 73-i7-k177-z17-ta733, will be designated. This designation method will contribute to the diversity research for blast races and rice resistance, to the pathological, genetic, and breeding studies of blast disease and rice varieties, and towards building up a strong protection system against blast disease through the enhancement of communication among pathologists and breeders at the ground level. In the meantime, this system will be used for building up the international standard differential system of blast resistance under the Japan International Research Center for Agricultural Sciences (JIRCAS) research project, “Blast Research Network for Stable Rice Production”, which is comprised of several research institutes from Asian countries, China, Vietnam, Laos, Philippines, Indonesia, Korea, the international organization, International Rice Research Institute (IRRI), and the National Institute of Agrobiological Sciences (NIAS) in Japan.

Figure, table

  1. Table 1. Infection type of LTH monogenic lines Pik locus genes to blast fungus isolates

    Table 1. Infection type of LTH monogenic lines Pik locus genes to blast fungus isolates

  2. Table 2. New designation system for blast races based on the reaction of monogenic lines with LTH genetic background

    Table 2. New designation system for blast races based on the reaction of monogenic lines with LTH genetic background
Affiliation

Japan International Research Center for Agricultural Sciences Biological Resources Division

National Institute of Agrobiological Sciences

Classification

Technical A

Term of research

FY2007（FY2006～2010）

Responsible researcher

Hayashi Nagao ( National Institute of Agrobiological Sciences )

KAKEN Researcher No.: 90391557

FUKUTA Yoshimichi ( Biological Resources Division )

ほか
Publication, etc.

Hayashi N. (2006). Syetem for designation of blast races using international rice blast line -Proposal of a new method-. Workshop on a differential system for blast resistance for a stable rice production environment. p6-7, IRRI, Los Banos

Hayashi N. (2006) 温暖地水稲育成系統立毛検討会, Nagakute, Aichi

Hayashi and Fukuta (2007) Abstracts of Phytopathological Society of Japan Annual Meeting p.74, no.223

Japanese PDF

2007_seikajouhou_A4_ja_Part4.pdf510.06 KB

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