title: [Role of phytochrome in organ formation processes in Cucumis sativus L].
abstract: The role of phytochrome B in the organogenesis process in the apical and axillary shoot meristems during early ontogenesis stages in cucumber Cucumis sativus L. at photoperiods (day/night) 10/14, 16/8 h, and continuous light in comparison with wild type plants and phytochrome B-deficient mutant (lh-mutant) was investigated. In mutant phytochrome B, deficiency caused inhibition of initiation of leaves both in the leading shoot and off-shoots and increased the number of flower buds (IV stage of organogenesis). With continuous light, the number of off-shoots and flowers during stage IV of organogenesis in wild-type plants increased twofold in comparison with the mutant. Short-term temperature drops did not induce floral ontogenesis in mutants but increased the number of off-shoots in both experimental variants during a long photoperiod and continuous light situations. We propose that phytochrome B, by increasing the compactness of chromatin, may facilitate coordination of ontogenesis processes with changing environmental conditions.
authors.forename: M I
authors.initials: MI
authors.lastname: Sysoeva
authors.forename: E F
authors.initials: EF
authors.lastname: Marovskaia
mesh_terms: D018553:Cucumis sativus / Q000196:embryology* / Q000235:genetics; D035264:Flowers / Q000196:embryology* / Q000235:genetics; D009154:Mutation; D038081:Organogenesis / Q000502:physiology*; D051939:Phytochrome B / Q000235:genetics / Q000378:metabolism*; D018515:Plant Leaves / Q000196:embryology* / Q000235:genetics; D018547:Plant Stems / Q000196:embryology* / Q000235:genetics
chemical_list: D051939:Phytochrome B