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Changes in polyamines content associated with zygotic embryogenesis in the Brazilian pine, Araucaria angustifolia (Bert.) O. Ktze.

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Author(s): Astarita Landro V. | Handro Walter | Floh Eny I.S.

Journal: Revista Brasileira de Botânica
ISSN 0100-8404

Volume: 26;
Issue: 2;
Start page: 163;
Date: 2003;
Original page

Keywords: Araucaria angustifolia | embryogenesis | polyamines

ABSTRACT
Changes in the polyamine content were analyzed in different embryo developmental stages and tissues during seed development in the conifer Araucaria angustifolia (Bert.) O. Ktze. Free polyamine contents varied according to the tissue and stage of embryo development, the highest levels occurring in the embryonic axis at the early stages, when putrescine and spermidine were most abundant. The levels of spermidine were higher from the stage where cotyledons arise, whereas putrescine decreases. The putrescine/spermine+spermidine ratio was higher during the initial phases of seed development, corresponding to cell multiplication and elongation, with a decrease in the final stages, corresponding to stabilization of the dry matter content.
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