Genetic interaction between Phaseolus vulgaris and bean common mosaic virus with implications for strain identification and breeding for resistance

E. Drijfhout

Research output: Thesisexternal PhD, WU

Abstract

<p/>Various strains of bean common mosaic virus (BCMV) occur in susceptible cultivars of bean. To compare these strains, a standard procedure for identification and a set of differential cultivars were established. The differentials are representatives of 11 resistance groups, determined by testing of about 450 bean cultivars with 8 to 10 strains. The virus strains and isolates were classified into 10 pathogenicity groups and subgroups, so that 10 strains were distinguished and the others considered as isolates of those strains.<p/>Twelve differentials were intercrossed and their F <sub><font size="-1">1</font></sub> and F <sub><font size="-1">2</font></sub> tested with most of the strains for genetical analysis of resistance in bean. Seven genes were distinguished: a necrosis gene <em>I</em> , already known from the literature, 5 strain-specific resistance genes <em>be-1, be-1 <sup><font size="-1">2</font></SUP>, bc-2, bc-2 <sup><font size="-1">2</font></SUP></em> and <em>bc-3,</em> and a strain-unspecific gene <em>bc-u,</em> complementary to the strain-specific ones. Genes <em>be-1</em> and <em>be-1 <sup><font size="-1">2</font></SUP></em> were allelic, as were <em>bc-2</em> and <em>bc-2 <sup><font size="-1">2</font></SUP>.</em> The 5 loci segregated independently or nearly so. The 4 strain-specific genes <em>bc-1</em> to <em>bc-2 <sup><font size="-1">2</font></SUP></em> had a gene-for-gene relationship with 4 pathogenicity genes, likely to be present in the virus strains. Gene <em>bc-3</em> had not been overcome by a corresponding pathogenicity gene. Two bean genotypes were developed with resistance to all known strains. Some implications for resistance breeding are discussed.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • Sneep, J., Promotor, External person
  • van der Want, J.P.H., Co-promotor, External person
Award date20 Sep 1978
Place of PublicationS.l.
Print ISBNs9789022006719
Publication statusPublished - 1978

Keywords

  • botany
  • cultivation
  • cultural methods
  • phaseolus vulgaris
  • plant diseases
  • plant disorders
  • plant pathology
  • plant pests
  • plant protection
  • plant viruses
  • cum laude

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