Don (would be possible to use coloration of the freshly germinated hypocotyl as a marker in roses) I use this every year as a means of determining whether or not a cross has worked for me. Certain pollinators I use, produce seedlings with dark coloured hypocotyl, this ensures me that the part of pollinators genome has been transferred accross to the seedling. It is the first thing I want to see as it breaks through the soil.
Warren