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Dynamics of endogenous auxins cyto kinins and abscisic acid like inhibitor in embryonic shoots of young scotch pine pinus sylvestris at the time of flower primordia initiation



Dynamics of endogenous auxins cyto kinins and abscisic acid like inhibitor in embryonic shoots of young scotch pine pinus sylvestris at the time of flower primordia initiation



Acta Societatis Botanicorum Poloniae 48(3): 473-482



Auxins, cytokinins and ABA[abscisic acid]-like inhibitor were determined in the embryonic shoots of young pines. The transition from vegetative to reproductive stage of pine development is connected with the decrease of the IAA level. In the group of vegetative plants as unknown auxin-like substance was detected. This substance appeared in the period of generative development initiation. Differentiation of female inflorescences was connected with the increase of the level of ABA-like inhibitor. However, the differentiation of male ones was connected with decrease of the amount of this inhibitor. No correlation between sex determination and the level of auxins and cytokinins was observed.

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