Today I was doing some searching for articles from the American Society for Horticultural Science sponsored journals (HortScience, HortTechnology, Journal of the American Society for Horticultural Science) and was surprised to find out they updated their website and articles are freely accessible. I didn’t go through my university link and was able to just open pdf’s from the recent years they have up on line now.
Go here and proceed from there: http://www.ashs.org/publications.html
You can search each journal independantly or use the umbrella search for all of them. There are some nice rose papers (and other papers as well).