Variation in the Number of Cotyledons in Scotch Pine
in the East of European Russia

A. I. Vidyakin and N. V. Glotov

Kirov Forest Breeding Laboratory, Central Research Institute of Forest Genetics and Breeding, ul. Nekrasova 65, Kirov,
610035 Russia

Biological Research Institute, St. Petersburg State University, Oranienbaumskoe shosse 2, Staryi Peterhof, 198904 Russia

Received November 18, 1998

Abstract—Population variation in the number of cotyledons in Scotch pine seedlings was studied within a part
of species range in the east of European Russia. Four zones were outlined, each comprising several population
groups differing in the average number of cotyledons. The observed variation of this character is explained by
the history of species dispersal in the Holocene. The boundaries of migration zones coincide with the external
boundaries of population groups identified previously (Vidyakin, 1991b, 1995).

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