Breeding Rotundifolia Grapes 
47 
SUMMARY. 
Our breeding work with the rotundifolia grapes has led to the follow¬ 
ing conclusions: 
1. That the sexes in seedlings of the rotundifolia grapes theoretically, 
are equally divided. 
2. That colors in rotundifolia grapes behave as Mendelian charac¬ 
ters ; and that by making the proper combinations, seedlings of either 
white, red, or black colors can be produced at will. 
3. That the Scuppernong, and all other white fruit-bearing vines, to¬ 
gether with all light-colored male vines, are pure for the white color; 
and that they do not carry the dark color as a recessive factor. 
4. That the Flowers, Mish, and Thomas are pure for dark colors, 
and do not carry the white color as a recessive factor. 
5. That James, Memory, and Smith are natural hybrid vines; that 
they are heterozygous for the black and the white colors. 
6. That Latham is a natural hybrid vine, heterozygous for the red 
and the white colors. 
7. That many of the dark colored vines, both male and female, grow¬ 
ing wild, are heterozygous for the colors black and white, black and 
red, or red and white. 
8. That the white color is recessive to all dark colors. 
9. That dark, red or black, colors are dominant over the white color. 
10. That black is dominant over red. 
11. That rotundifolia grape vines may be either pure white, pure 
black, pure red, heterozygous for black and white, black and red, or 
red and white. 
12. That the light and dark colors of the vines are correlated with 
similar colors in the fruits of those respective vines. 
13. That the average size of the fruit cluster can be enlarged by the 
judicious selection of very large-sized flower-clustered male vines. 
14. That the actual size of the flower cluster, under good conditions 
for cross-pollination, does not determine the actual size of the resulting 
fruit cluster. 
15. That self-sterility alone is not altogether responsible for the 
small-sized fruit clusters. 
16. That the seedlings of rotundifolia grape vines vary considerably 
in size of berry, flavors and qualities, thickness of skin, character of 
pulp, and size of seed. That by proper combination of parent vines, 
desirable seedlings can be produced. 
17. That the Scuppernong grape does not readily hybridize with 
V. aestivalis, V. cinerea, Herbemont, Winchell, and Niagara. 
