[Secondary flowering: the induction and development abnormalities].

Time of flowering substantially determines a level of reproductive success of populations. As a rule, plants of a seasonal climate blossom once a year, during period which is optimal for successful pollination and the subsequent maturing of fruits (seeds). However, secondary flowering is registered for many species. This phenomenon is interpreted differently: as a display of initially continuous flowering or as a result of various damages. In this connection, secondary flowering is considered from a standpoint of modern ideas about a variety of models of flowering of populations (annual, non-annual, continuous, and incidental flowering), mechanisms of formation (a hypothesis of"adaptation", "phylogenetic constraint", "indirect selection", and "casual changes"), and control of flowering time (model of the plural control). From traditionally wide point of view, the secondary flowering includes two phenomena: secondary flowering of a population and that of an individual. The first one is caused by age differentiation of individuals and by the genetic polymorphism. The second one represents in most cases plant reaction to various developmental abnormalities resulted from ageing, sprouts drowning or damages.