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Netherlands Journal of Plant Pathology

, Volume 89, Issue 1–2, pp 31–45 | Cite as

Qualitative and quantitative variation in pathogenicity of races of coffee leaf rust (Hemileia vastatrix) detected in the State of São Paulo, Brazil

  • A. B. Eskes
Article
  • 107 Downloads

Abstract

Between 1977 and 1981, seven qualitatively distinct new races of coffee leaf rust (Hemileia vastatrix) were detected in breeding plots in the State of São Paulo, Brazil. Four races carry complex virulence against the resistance genes SH1, SH2, SH4 and SH5 ofCoffea arabica. Three races match unidentified resistance genes ofC. canephora. Two of these were isolated from cv. Kouillou and one from the hybrid population Icatu. Pending further identification, these races were indicated by the number of their type cultures (Is. 2, 10 and 11). Is. 2 and Is. 10 showed extra virulence to some coffee genotypes and decreased virulence to other coffee genotypes, suggesting stabilizing selection.

Three rust isolates were detected which differed quantitatively from the common rust race II. Is. 1 was moderately virulent to the coffee differential for SH3 in the laboratory but avirulent in the greenhouse, indicating a host x pathogen x environment interaction. Is. 3 and 12 showed levels of virulence intermediate between race II and Is. 2 and 10, respectively.

The results show that incomplete resistance of coffee toH. vastatrix, at various levels, can be race-specific. The nature of race formation of coffee leaf rust in Brazil and breeding strategies for obtaining durable resistance are discussed.

Samenvatting

Tussen 1977 en 1981 werden zeven kwalitatief verschillende nieuwe fysio's van koffieroest (Hemileia vastatrix) gevonden in veredelingsproefvelden in de staat São Paulo, Brazilië. Vier fysio's bevatten complexe virulentie tegen de resistentiegenen SH1, SH2, SH4 en SH5 vanCoffea arabica. Drie fysio's neutralizeren nog ongeïdentificeerde resistentiegenen vanC. canephora. Twee van deze fysio's werden van cv. Kouillou geïsoleerd en één van de hybride populatie Icatu. In afwachting van verdere identificatie zijn deze drie fysio's aangeduid met hun isolaatnummer (Is. 2, 10 en 11). Is. 2 en 10 vertoonden naast extra virulentie t.o.v. bepaalde koffiegenotypen verminderde virulentie t.o.v. andere genotypen, hetgeen kan wijzen op stabiliserende selectie.

Tevens werden drie roestisolaten ontdekt die kwantitatief verschilden van het gangbare fysio II. Is 1 was matig virulent op de differentiërende kloon voor het SH3 resistentiegen in het laboratorium maar avirulent in de kas, wat duidt op een waardplant x fysio x milieu-interactie. De virulenties van Is. 3 en 12 lagen in tussen die van fysio II en Is. 2, respectievelijk fysio II en Is. 10. De resultaten tonen aan dat incomplete resistentie van koffie tegen koffieroest, van variërend niveau, fysiospecifiek kan zijn.

De aard van het ontstaan van de nieuwe roesfysio's in Brazilië en veredelingsstrategieën voor het verkrijgen van duurzame resistentie tegen koffieroest worden besproken.

Additional keywords

incomplete resistance durable resistance stabilizing selection 

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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 1983

Authors and Affiliations

  • A. B. Eskes
    • 1
  1. 1.Instituto Agronômico de Campinas (I.A.C.)CampinasBrazil

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