Inheritance of high palmitic acid content in the sunflower mutant CAS-12 and its relationship with high oleic content
2002
Perez-Vich, B. | Garces, R. | Fernandez-Martinez, J.M.
CAS-12 is a sunflower mutant with increased levels of palmitic (C16:0 = 30%) and oleic (C18:1 = 55%) acids in its seed oil, hence it has a reduced linoleic acid content (C18:2 < 5%). This study was conducted to determine the inheritance of high C16:0 content and its relationship with high C18:1 content in CAS-12. Reciprocal crosses involving CAS-12, CAS-5 (high C16:0 content), HAOL-9 (high C18:1 content) and HA-89 (standard fatty acid profile) were made. The F1, F2 and BC1F1 generations were obtained. The genetic control of the high C16:0 trait in CAS-12 was partially recessive and gametophytic. In all cases, this character segregated in the ratio 19:38:7 (low:intermediate:high C16:0 content) in the F2 generation. These results, together with the lack of segregation for C16:0 content in crosses between CAS-12 and CAS-5, indicated that the genetic control of the high C16:0 trait in CAS-12 was similar to that in CAS-5 in being controlled by partially recessive alleles (p1, p2, and p3) at three loci. Crosses between HA-89 and CAS-12, and HAOL-9 and CAS-5 (segregating for C16:0 and C18:1) demonstrated that the high C16:0 and the high C18:1 traits were independently inherited. However, C18:1 segregation in these crosses exhibited reversal of dominance. Apparently, the low C18:1 parental lines carried modifier genes causing the deviation.
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