Table 2.

Leaf morphological traits for parental grapevines ‘Horizon’ and Illinois 547-1

Trait	‘Horizon’	Illinois 547-1	p-value
Domatia size (mm)	0.95	1.27	0.11
Domatia (rating)	7.5	8.5	<0.0001
Bristles on leaf veins (density)	1.8	7.9	<0.0001
Bristles on leaf blade (density)	0.2	4.0	<0.0001
Hairs on leaf veins (density)	4.0	3.1	0.013
Hairs on leaf blade (density)	3.6	0.0	<0.0001

Values correspond to the means of ten independent leaves. The density of bristles and hairs was measured on a discrete scale from 0 (absent) to 9 (very dense), and four domatia per leaf were measured and rated with the bristle scale. Significance of differences were obtained by a t-test