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Some features of crone formation in common pine (Pinus sylvestris L.)

We consider the crone formation in common pine Pinus sylvestris L. from the point of view of the architectural model and reiteration concepts. Reiteration complexes in P. sylvestris lack dormant buds at the base of annual complexes while regeneration buds are concentrated at the distal part of an annual shoot. The function of dormant buds in this species is shifted to lateral buds located under branch whorls, and terminal buds of brachyblasts. The latter can also function as regular regeneration buds. Dormant buds of the first kind remain alive usually for up to 5 years, those of the second kind remain alive up to 4 years. Natural aging and death of skeletal axes in P. sylvestris doesn’t lead to the formation of a secondary crone able to replace the primary one. However, reiteration complexes easily appear in this tree as a response to traumatic damage, including pruning, of two- to three-year-old shoot systems. More severe damage may lead to the death of a tree.

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