Abstract
Meiosis during microsporogenesis in Siberian Fir (Abies sibirica Ledeb.) in the East Sayan middle mountains (the territory of national park “Stolby”, the valley of the river Laletin and Upper Kaltat river) has been studied. Microsporogenesis has been investigated in details in healthy, damaged by fungi (Melampsorella cerastii Wint.) and drying trees. Features of A. sibirica meiosis have been revealed. Mei‐otic abnormalities have been found in all trees at different stages. Specific abnormalities have also been revealed in some trees.
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