Phytohormones in Sweet Cherry Buds During Winter Rest and Bud Development

Abstract This (two-season) study was undertaken to assess the involvement of gibberellins (GAs), cytokinins (CKs), and auxins (AX) in dormancy sweet cherry buds ‘Summit’. Our hypothesis consisted assumption that representatives these hormone groups are able mark transition between different phases. Changes endo- ecodormancy stages ontogenetic development were not recognizable by bioactive GA 1 , 5 7 . The transient increase 3 during might be interpreted as an indication preservation ecodormancy. content biological active bases t Z, c DHZ equal However, increased significantly first phase development. summation various CKs (total iP-type, total Z-type, CK bases, ribosides, nucleotides, O -glucosides, N CKs) showed no differences regarding their levels These values markedly subsequent phase. AX after By contrast, from side green until open cluster occurred. As shown for AX, oxIAA IAAsp low endodormancy transiently early revealed changes GAs (exception ), CKs, occurred winter rest, more precisely, metabolites, therefore, suitable differentiate ontogenesis is accompanied specific molecules, precursors, conjugation products.