RT Journal Article SR Electronic T1 The Relationship Between Norton and Cynthiana, Red. Wine Cultivars Derived from Vitis aestivalis JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 441 OP 444 DO 10.5344/ajev.1993.44.4.441 VO 44 IS 4 A1 Bruce I. Reisch A1 Robert N. Goodman A1 Mary-Howell Martens A1 Norman F. Weeden YR 1993 UL http://www.ajevonline.org/content/44/4/441.abstract AB The similarity of grape cultivars Norton and Cynthiana was investigated via isozyme and botanical analyses. Five isozyme systems, MDH, GPI, DIAP, PGM, and LAP, presented identical banding patterns for two accessions of Cynthiana and for seven accessions of Norton. The color of the indument varied from white to rusty brown on shoot tips grown from cuttings, even within accessions. Plants with white shoot tips were infrequent. Pigmented shoot tips had the same isozyme profile as pigmentless shoot tips. No other significant morphological differences between the Norton and Cynthiana genotypes were noted. Norton and Cynthiana may be cultivars derived from the same clonal source.