Resistance to rice blast in a line derived from Oryza minuta
1994
Reimers, P.J. | Bordeos, A.A. | Calvero, A. | Estrada, B.A. | Mauleon, R. | Nahar, N.S. | Darwis, S. | Correa, F. | Nelson, R.J. (International Rice Research Inst., Los Banos, Laguna (Philippines))
It was previously observed that NIL127 remained Bl-free when planted in the IRRI blast nursery and in lowland field plots on the IRRI farm. NIL127 was also resistant to field populations of Bl in all upland screening sites where it was tested. At the Santa Rosa, Colombia sites, for example, six lineages are known to be present, yet the line has remained resistant for three seasons. Hypersensitive lesions were observed (type 0 or 1), although it was not possible to obtain any viable Bl isolates from them. On the other hand, lesions on the recurrent parent, OsS, were usually type 4 (susceptible). It was concluded that NIL127 performs well under Bl stress at a variety of sites. Although the resistance in NIL127, presumably contributed by a resistance gene from O. minuta in the IR31917-45-3-2 background, may not be effective against artificial inoculation with some lineage 4 isolates, NIL127 functions effectively in the field. The apparent susceptibility of NIL127 to some isolates in greenhouse tests suggests that this wild species-derived resistance gene is not likely to condition durable resistance alone, although it may be a useful component in a gene pyramiding program
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