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Stability of Internal Heat Necrosis and Specific Gravity in Tetraploid x Diploid Potatoes

^a Virginia Polytechnic and State Univ., Eastern Shore Agric. Res. and Extension Center, Painter, VA 23420
^b Rutgers Univ., New Brunswick, NJ 08903
^c North Carolina State Univ., Vernon James Res. and Extension Center, Plymouth, NC 27962
^d Northeast Agricultural Univ., Harbin, Heilongjiang 150030, People's Republic of China
^e Biometrical Consulting Service, Beltsville, MD 20705
^f USDA/ARS, Vegetable Laboratory, Beltsville, MD 20705

View larger version (24K): [in a new window]   Fig. 1. Accumulated heat units according to the model of Lee et al. (1992) during the growing season for Plymouth, NC, Painter, VA, and Bridgeton, NJ, in 1999 and 2000.

View larger version (29K): [in a new window]   Fig. 2. Distribution of clones for incidence (x 100) of internal heat necrosis and stability before removal of environmental heterogeneity and specific gravity (SG) for the 26 4x-2x clones and the two checks (‘Atlantic’ and B9955-11) grown in Plymouth, NC, Painter, VA, and Bridgeton, NJ, in 1999. Two clones with SG > 1.090 are not shown.

View larger version (26K): [in a new window]   Fig. 3. Distribution of clones for incidence (x 100) of internal heat necrosis and stability before removal of environmental heterogeneity and specific gravity (SG) for the 88 4x-2x clones and the check (‘Atlantic’) grown in Plymouth, NC, Painter, VA, and Bridgeton, NJ, in 2000.