ISHS Acta Horticulturae 619: XXVI International Horticultural Congress: Potatoes, Healthy Food for Humanity: International Developments in Breeding, Production, Protection and Utilization
ASCORBIC ACID CONCENTRATION AND STABILITY IN NORTH AMERICAN POTATO GERMPLASM |
| Authors: | S.L. Love, T. Salaiz, B. Shafii, W.J. Price, A.R. Mosley, R.E. Thornton |
| Keywords: | Solanum tuberosum, vitamin C. biplot analysis |
| Abstract:
Potatoes are a valuable source of the essential human nutrient ascorbic acid (vitamin C). As a first step in breeding for potatoes with higher levels of ascorbic acid, 75 parental clones from 12 North American potato breeding programs were evaluated for concentration and stability of expression. Trials were grown in Idaho, Oregon, and Washington in 1999 and 2000 and tubers sampled and quantified for ascorbic acid. ANOVA demonstrated both a highly significant clone main effect and a clone by environment interaction. Mean ascorbic acid concentration of the parental clones appeared to be continuous over a range of 29.8 to 11.5 mg 100 g-1. A subgroup of ten parental clones was analyzed using an additive main effects and multiplicative interaction (AMMI) model, to diagnose interaction patterns and measure clone stability. The first two principal component axes accounted for over 80% of the variability. Bi-plot analysis showed ‘Ranger Russet’ to be highly unstable across the environments tested. A plot of Tai’s stability statistics found 6 of the 10 parental clones to be stable for ascorbic acid expression. The wide range of variability in the tested population, high genotype combined with low G x E interaction variance, and presence of stable genotypes among parental clones suggests the possibility of rapid breeding progress for ascorbic acid concentration in potatoes. The best evaluation methods for ascorbic acid concentration must involve multi-year testing. | |
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