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4x–2x Potato Clones with Resistance or Susceptibility to Internal Heat Necrosis Differ in Tuber Mineral Status

^a Virginia Tech, Eastern Shore Agric. Research and Extension Center, Painter, VA 23420
^b USDA-ARS, Vegetable Lab., Beltsville, MD 20705
^c North Carolina State Univ., Raleigh, NC 27695-7609
^d Rutgers Univ., New Brunswick, NJ 08903
^e Biometrical Consulting Service, Beltsville, MD 20705

View larger version (26K): [in a new window]   Fig. 1. Accumulated heat units according to the model of Lee et al. (1992) during the growing season for each location–year.

View larger version (22K): [in a new window]   Fig. 2. Comparisons of yield, specific gravity, and incidence and severity of IHN between previously identified IHN-resistant (black bars) and IHN-susceptible (white bars) clones for each location–year. Tests of significant differences between IHN-resistant and IHN-susceptible clones within each location–year indicated above bars. *,**, and ns, significant at the 0.05 and 0.01 probability levels or not significant, respectively.

View larger version (44K): [in a new window]   Fig. 3. Comparisons of pith tissue concentrations between IHN-resistant (black bars) and IHN-susceptible (white bars) clones for each location–year. Tests of significant differences between IHN-resistant and IHN-susceptible clones within each location–year indicated above bars. *,**, and ns, significant at the 0.05 and 0.01 probability levels or not significant, respectively.

View larger version (35K): [in a new window]   Fig. 4. Results of the CART analyses of tissue nutrient concentration on incidence of IHN for 4x–2x clones grown in Plymouth, NC, Painter, VA, and Bridgeton, NJ, in 2001 and 2002. At each branch, the tissue nutrient concentration associated with greater resistance to IHN is shown on the left-hand side of the branch and the tissue nutrient concentration associated with greater susceptibility is found on the right-hand side of the branch.