Mutability of the self-incompatibility locus and identification of the S-bearing chromosome in Nicotiana alata

A.J.G. van Gastel

Research output: Thesisexternal PhD, WU

Abstract

<p/>γrays, X rays, fast neutrons and ethyl methanesulfonate (EMS) were used for inducing mutations at the self-incompatibility locus of <em>Nicotiana alata.</em><p/>Chronic gamma irradiation and EMS treatment neither induced selfcompatibility mutations nor led to changes from one S allele to another. X rays and fast neutrons induced many self-compatibility mutations, but did not generate new self-incompatibility alleles.<p/>Triploid individuals were male sterile.<p/>Tri(S)allelic aneuploid plants were self-incompatible because heterogenic di(S)allelic pollen grains are not functional.<p/>Self-compatibility in pollen-part mutants with and without a centric fragment was explained by complementation of the mutant S allele by a fragment or duplication. Deviations of expected segregation ratios were explained by lethality of S homozygotes.<p/>It was shown that the longest unsatellited acrocentric chromosome is the S-bearing chromosome.
Original languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
Supervisors/Advisors
  • van der Veen, J.H., Promotor, External person
  • de Nettancourt, D., Co-promotor, External person
Award date28 May 1976
Place of PublicationWageningen
Publisher
Print ISBNs9789022006030
Publication statusPublished - 1976

Keywords

  • botany
  • nicotiana
  • reproduction
  • solanaceae
  • tobacco
  • self compatibility
  • mutations
  • loci
  • triploidy
  • aneuploidy

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