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Plant Cell, Tissue and Organ Culture
78: 83-91, 2004.

Karoliina Niemi
Department of Applied Biology
University of Helsinki
P.O. Box 27, FIN-00014 Helsinki, Finland

Carolyn Scagel
USDA, Agricultural Research Service
Horticultural Crops Research Laboratory
Corvallis, OR 97330, USA

Hely Haggman
Finnish Forest Research Institute
Pankaharju Research Station
FIN-58450 Punkaharju, Finland
Department of Biology
University of Oulu
P.O. Box 3000, FIN-90014 Oulu, Finland