Although it's wikipedia, the mention of glycoalkoloid production on an unearthed potato leads me to believe that it is still an accurate statement.
http://en.wikipedia.org/wiki/Solanine
This also somewhat corroborates that:
http://www.drweil.com/drw/u/id/QAA252785
http://culinaryarts.about.com/od/pot...p/solanine.htm