74.シロイヌナズナ発達種子におけるホルモン代謝(口頭発表)

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During seed development, abscisic acid (ABA) is involved in the accumulation of storage compounds, acquisition of desiccation tolerance and induction of dormancy. To understand the regulation of ABA metabolism and the mode of ABA actions, we conducted precise quantification analysis of ABA and its metabolites during Arabidopsis seed development. During middle stage of seed development, ABA was actively synthesized in the tissue derived from maternal origin (seed coat), and ABA synthesized in this tissue appeared to be transported to the embryo. In later stage, ABA accumulated in silique envelopes and to a lesser extent in seeds. ABA accumulated in seeds in this stage was dominantly synthesized in embryos. The levels of ABA metabolites fluctuated according to the changes in ABA levels during seed development. Accumulation of ABA metabolites appeared to be regulated differentially depend on metabolic pathways. Recent studies indicate that hormones interact at the level of both metabolism and signaling. Therefore, it is required to analyze possibly all hormones in order to understand hormonal regulation of physiological processes of plants. We are now conducting precise quantification of gibberelliens, auxin (indole-3-acetic acid), cytokinins, jasmonates and salicylic acid in the context of seed development.
2009-10-06