Home – Home – Jornals – Contemporary Problems of Ecology 2002 number 2

Analysis of germination of seeds of 117 rare and disappearing species of Siberian flora at definite temperature conditions has permitted distinguishing three ecological groups: the thermophile group - the most numereous one (64 %) whose seeds can germinate at high positive temperatures 0f 18-30 ^oC; thermopsychrophile (intermediate) group of species (13 %) - a part of seeds germinate at high positive temperatures, and the major part can germinate after exposure to low positive temperatures (0-5 ^oC), and the third, psychrophile group (24 %) whose seeds germinate only at low positive temperatures or after an exposure to these. Characteristic of seeds of many species is a wide range of normal reaction to temperature and illumination conditions, which is determined by their origin and complicated history of genesis of Siberian flora. P. 221-236