|Novy, Richard - Rich|
Submitted to: American Journal of Potato Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/8/2004
Publication Date: 1/1/2005
Citation: Love, S. L., Salaiz, T., Novy, R.G. 2005. Occurrence of High Glycoalkaloid Content Progeny from Low Level Parents A7816-14 and Russet Norkotah. American Journal of Potato Research. 82 (1):78-79. Interpretive Summary:
Technical Abstract: Analysis associated with the 1996 Tri-state trial revealed a total tuber glycoalkaloid (TTGA) concentration of 22.4 mg/100g FWB in the selection A8894-8, a cross of A7816-14 and Russet Norkotah. Both parental clones historically exhibited low to moderately low TGA levels. To elucidate this phenomenon, four progeny populations (A7816-14 x Russet Norkotah, its reciprocal, plus selfs of each parent) were generated. Fifty individuals from each cross were grown at Aberdeen, ID during 2001 and 2002 in a RCB design with 4 replications. Tuber samples were obtained and glycoalkaloids determined. Mean parental TTGA concentrations across years were 2.1 and 6.4 mg/100 g for Russet Norkotah and A7816-14, respectively. TTGA concentrations of the A7816-14 x Russet Norkotah progeny population, and the reciprocal population were normally distributed, had means not significantly different from the parental midpoint, and had no individuals with concentrations above 8 mg/100g. The TTGA concentrationf of the Russet Norkotah selfed progeny population were slightly skewed upward, but tended to concentrate near the parent. The selfed progeny of A7816-14 separated into a distinct bimodal distribution. One mode, consisting of 46 individuals, was normally distributed and concentrated at the parental mean. The other mode consisted of 4 individuals, all with TTGA concentrations above 17 mg/100 g. The ratio of individuals between the high and low modes did not clearly fit any dominant or recessive one or two gene models. It appears as though a combination of genes from a parent such as A7816-14 can, via epistatic interactions, result in transgressive high TTGA individuals in crosses (or selfs) among low concentration parents.