Morphology of the Shoot System of (Poaceae)

The biomorphological features of Scolochloa festucacea (Willd.) Link in the central part of European Russia have been studied; the modular and structural-functional organization of the shoot system has been considered and the life form has been clarified. It was found that S.festucacea is characterized by the resumption of a mixed type (a combination of intra- and extravaginal types) and a combination of silliptic and cataleptic types of branching. The presence of an extravagant type of branching is manifested in the potential for the formation of partial bushes, the presence of which contributes to a stronger fixation of the plant in space. The combination of two types of branching leads to heterochromy, the development of buds at different times. The possibility of shoots lies down, their further rooting in nodes and the subsequent development of axillary buds into orthotropic shoots has been shown, which contributes to the correction of the spatial structure of the clone, the growth of its total assimilating surface and a potential increase in reproductive function. A comparative analysis of the modular organization of S.festucacea has shown its similarity in the number and types of elementary modules with those of long-rhizome sympodial the growth of long-shoot helophytes. The analysis of the structural and functional organization of S.festucacea monocarpic shoots revealed the presence of three variants differing in a set of structural and functional zones.