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Theoretical and Applied Genetics

, Volume 99, Issue 3–4, pp 663–669 | Cite as

Genetic control of high stearic acid content in the seed oil of the sunflower mutant CAS-3

  • B. Pérez-Vich
  • R. Garcés
  • J. M. Fernández-Martínez
Article

Abstract 

A sunflower mutant, CAS-3, with about 25% stearic acid (C18:0) in the seed oil was recently isolated after a chemical-mutagen treatment of RDF-1-532 seeds (8% C18:0). To study the inheritance of the high C18:0 content, CAS-3 was reciprocally crossed to RDF-1–532 and HA-89 (5% C18:0). Significant reciprocal-cross differences were found in one of the two crosses, indicating possible maternal effects. In the CAS-3 and RDF-1–532 crosses, the segregation patterns of the F1, BC1, and F2 populations fitted a one-locus (designated Es1) model with two alleles (Es1, es1) and with partial dominance of low over high C18:0 content. Segregation patterns in the CAS-3 and HA-89 crosses indicated the presence of a second independent locus (designated Es2) with two alleles (Es2, es2), also with partial dominance of low over high C18:0 content. From these results, the proposed genotypes (C18:0 content) of each parent were as follows: CAS-3 (25.0% C18:0) =es1es1es2es2; RDF-1–532 (8.0% C18:0) =Es1Es1es2es2; and HA-89 (4.6% C18:0) =Es1Es1Es2Es2. The relationship between the proposed genotypes and their C18:0 content indicates that the Es1 locus has a greater effect on the C18:0 content than the Es2 locus. Apparently, the mutagenic treatment caused a mutation of Es1 to es1 in RDF-1–532.

Key words Helianthus annuus Sunflower mutant Stearic acid Oil quality Genetic control 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • B. Pérez-Vich
    • 1
  • R. Garcés
    • 2
  • J. M. Fernández-Martínez
    • 1
  1. 1.Instituto de Agricultura Sostenible, CSICCórdobaES
  2. 2.Instituto de la Grasa, CSICSevillaES

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