Nov22,27,06

Nov22,27,06 - November 22, 2006 Hormones cont'd o BR,...

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November 22, 2006 Hormones cont’d o BR, ethylene, and cyokinin have overlapping functions and specific activities Ethylene Cytokinine -Phosphorelay blocks degredation of a transcription factor -Phosphorelay results in the activation of a transcription factor *In the absence of ethylene, the transcription factor is degraded *In the presence of ethylene, the transcription factor is stabilized *There is an activation of the transcription factor by phosphorylation Auxin Giberellin -Auxin induces the degradation of AUX/IAA proteins, thus permitting transcription -GA induces degradation of SLR (an inhibitor) protein, thus permitting transcription Embryos o Morphogenesis o Physiological maturation Desiccation tolerance Dormancy Acquire physiological independence/autonomy (ie, the ability to undergo photosynthesis, manufacture vitamins) o Germinate – the emergence from dormancy Abscisic acid (ABA) – promotes maturation (seed development) Transcription factors for storage genes, desiccation tolerance, and dormancy Giberellins (GA) – promotes germination Essential for causing seed to emerge from dormancy and to germinate Promotes the expressions of proteoases which destroy the
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Nov22,27,06 - November 22, 2006 Hormones cont'd o BR,...

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