Metamorphosis differences of caudiciform plants as an adaptation to arid conditions

In the course of evolution, formation succulent variations in underground and surface parts plants different taxa could occur simultaneously under influence similar abiotic factors, particular as an adaptation to arid conditions, structural features even distant families are a manifestation convergent evolution. Along with this, development such adaptive structures ontogeny can ways taxa. Studying anatomical morphological vegetative organs Fockea edulis (Asclepiadoideae, Apocynaceae) at early stages ontogenesis comparing them those other will improve understanding growth caudex-like plants. The research was conducted on seedlings, juvenile immature F. edulis. When three representatives Apocynaceae family, we found that strategy traits organ level is characterized by active hypocotyl already seedling stage, Adenium obesum, subsequent expanded basal part stem due combined cortex-pith thickening radish-like root xylem parenchyma. However, Petopentia natalensis mesophytic seedling. It established secondary occurs two individual ways: cambium generates solid rings phloem parenchymatized xylem; P. edulis, bundle type conducting elements preserved. tap A. obesum.