Fitopatologia Brasileira (2004) 29, 631-637

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João L. Nunes Maciel, Paula C. Silvério Rodrigues, Paulo A. Gomes and Marcelo Gravina Moraes (2004)
Análise da variabilidade genética de duas cultivares Raminad Str. 3 utilizadas como diferenciadoras de raças de Pyricularia grisea
[Analysis of the genetic variability of two Raminad Str. 3 cultivars used to differentiate Pyricularia grisea races]
Fitopatologia Brasileira 29 (6), 631-637
Abstract: The knowledge of the occurrence and distribution of races of Pyricularia grisea is important in rice (Oryza sativa) breeding programs. However, for the correct identification of the races of the pathogen and to compare them with other reports, it is necessary to utilize race differential genotypes that exhibit identical genetic characteristic and source. The main objective of this work was compare the genetic variation of two genotypes of Raminad Str. 3 utilized as one of the eight international differentials and to examine the race composition of P. grisea in the State of Rio Grande do Sul, Brazil. Of 39 microsatellite markers used to verify the genetic differences between the two genotypes identified as the Raminad Str. 3, 20 exhibited polymorphism. The race determination was based on the reaction of differentials submitted to inoculation with 85 monosporic isolates from 14 rice growing municipalities of Rio Grande do Sul. The infection types were scored according to the standard evaluation international system for rice diseases, 14 days after inoculation.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): João L.N. Maciel

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Pyricularia oryzae Rice (Oryza) Brazil (south)