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CROP BREEDING, GENETICS & CYTOLOGY

Inheritance of Medium Stearic Acid Content in the Seed Oil of a Sunflower Mutant CAS-4

^a Instituto de Agricultura Sostenible (CSIC), Apartado 4084, E-14080 Córdoba, Spain
^b Instituto de la Grasa (CSIC), Apartado 1078, E-41080 Sevilla, Spain

* Corresponding author (cs9femaj{at}uco.es)

The sunflower (Helianthus annuus L.) line CAS-4 obtained by mutagenesis has an increased stearic acid (C18:0) content in its seed oil (130 g kg^-1), which is desired for some food products. The objectives of this study were to determine (i) the inheritance of medium C18:0 content in CAS-4, (ii) the relationship between CAS-4 and the high C18:0 mutant CAS-3, and (iii) if recombinants with higher C18:0 content than CAS-3 could be obtained. CAS-4 was reciprocally crossed with its original parental line RDF-1-532 (80 g kg^-1 C18:0), HA-89 (standard low 50 g kg^-1 C18:0), and CAS-3 (250 g kg^-1 C18:0). The fatty acid content of the F₁, F₂, BC₁F₁ to both parents, and F₃ seeds was analyzed by gas-liquid chromatography (GLC). Alleles controlling low C18:0 exhibited partial dominance to those for medium C18:0, and these were partially dominant to those for high C18:0. Segregation patterns fit a two-loci model for the HA-89 x CAS-4 cross and one-locus model for the RDF-1-532 x CAS-4 and the CAS-3 x CAS-4 crosses. We concluded that medium C18:0 content of CAS-4 was controlled by alleles at the Es1 and Es2 loci previously identified in CAS-3, or at tightly linked loci. The CAS-4 alleles at the Es2 locus are those present in CAS-3 (es2es2), whereas the alleles at the Es1 locus are different from those of CAS-3 (es1es1) and have been designated es1^bes1^b. The proposed genotype (C18:0 content) of CAS-4 is es1^bes1^bes2es2. The continuous distribution observed in the HA-89 crosses with CAS-4 indicated that minor genes and environmental effects also are important in the expression of C18:0 content in CAS-4.

This article has been cited by other articles:

				B. Perez-Vich, L. Velasco, J. Munoz-Ruz, and J. M. Fernandez-Martinez Inheritance of High Stearic Acid Content in the Sunflower Mutant CAS-14 Crop Sci., December 2, 2005; 46(1): 22 - 29. [Abstract] [Full Text] [PDF]

				B. Perez-Vich, J. Munoz-Ruz, and J. M. Fernandez-Martinez Developing Midstearic Acid Sunflower Lines from a High Stearic Acid Mutant Crop Sci., January 1, 2004; 44(1): 70 - 75. [Abstract] [Full Text] [PDF]