Shoot formation model (architectural model) Phlomoides oreophila

Abstract

The morphological characteristics of Phlomoides oreophila, which grows in the Altai Mountains and Southeast Kazakhstan, are given. It is established that the species belongs to the monopodial-rosette model of shoot formation. The main structural unit is a perennial basal (skeletal) rosette shoot. Its annual growths form an epigeogenic oblique-orthotropic rhizome. An elementary shoot appears during 1 growth period and carries the vegetative and generative parts. The formula of the functional zones of the elementary shoot is determined: the inhibition zone → [innovation zone] → amplification zone → apical bud. It was established that the boundaries of the elementary and annual shoots do not coincide. Elementary shoot includes spring leaf generation (inhibition zone), summer leaf generation with axillary vegetative buds (innovation zone) and vegetative-generative buds (amplification zone). Vegetative-generative shoots appear only after wintering the following spring. They are located below the rosette leaves of the spring generation (this is the beginning of a new elementary shoot). As a result, the annual shoot includes the elementary shoot of the current year, as well as the amplification zone of the elementary shoot of last year.