MORPHOPHYSIOLOGICAL ANALYSIS OF ORGANOGENESIS OF SOME VARIETIES OF THE GENUSCYMBIDIUM UNDER CLOSED CONDITIONS

The article presents the results obtained under indoor conditions in the study of biomorphological and morphophysiological features of some varieties of the genus Cymbidium, the change of age periods in ontogenesis, especially the development cycle of vegetative and generative shoots.Morphophysiological studies have shown that in stage I of organogenesis, regardless of type, new shoots of Cymbidium are formed from the previous vegetative shoot in the form of an axillary meristem, while it is still in the phase of internal bud development.At stage II of organogenesis, a year after the beginning of shoot growth, 8-11( 12) primordium leafy shoots surrounding the growth cone are formed from its axillary meristem.In August-October, the growth cone of the generative shoot differentiates, i.e. the generative shoot enters stage III of organogenesis.During this period, the generative shoot begins to grow intensively and enters stage IV of organogenesis.At this time, the axis of the inflorescence is formed, the basis for flower formation is laid, then the flower base, pistil and stamen are formed.At the V stage of organogenesis, in the second decade of July, mass formation of generative shoots is observed.Formation and development of flowers in the inflorescence occurs acropetally.At this time, all flower organs grow very slowly, and only shortly before flowering the plant enters the VI-VIII stage of organogenesis.Depending on the variety, stage IX of organogenesis occurs in December-February and lasts until May.Fetal formation, growth and development (X-XII stages of organogenesis) takes 10-12 months.As the fruits mature, the generative shoot withers, which means the completion of its development cycle.Thus, the studies have shown that the process of organ formation in orchid shoots is subject to general biological regularity and combines features characteristic of certain species and varieties.