HAU16008-03-2 - Mechanisms of Plant Gene Expression Lecture...

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1 Mechanisms of Plant Gene Expression Lecture 3 Wednesday October 29 2008 Diversity and extremes of plant functions Growth: mature Sequoiadendron giganticus 2.5 x 10 11 larger than its seed bamboo shoots may grow 1 meter in a day Transpiration: a single corn plant may transpire 200L of water in a season (provides water, cooling, solute transport) http://www.naturepl.com/photocaptions35.html Reproduction: flowering, seed set, fruit formation, seed maturation Photoresponses, circadian rhythms, photoperiodism Defense against pests and pathogens and encroachment by other plants Defense against abiotic stress: drought, temperature extremes, soil constituents Exothermic futile metabolic cycle: Crocus emergence through snow Voodoo lily volatilizes compounds to attract carrion flies Trapping and digestion of insects for phosphorus and nitrogen Diversity and extremes of plant functions http://www.emsb.qc.ca/laurenhill/science/thermogenic.html www.andystoys.net www.sarracenia.com
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2 Core Concepts: Great diversity and extremes of plant functions Site specific accumulations of specific proteins as a reflection of regulation Highly regulated synthesis, transport, and degradation of proteins and RNA molecules Regulation by both activation and suppression of reactions Promoters, enhancers, silencers, transcription factors, and remodeling of chromatin in the activation and suppression of transcription Auxin-responsive gene regulation Alternative spicing of transcripts (mentioned only) Translation and protein transport regulation Designer promoters and transcription factors for biotechnology Genotype x Environment Æ Phenotype Success of the plant – The plant produces progeny, and those progeny survive and produce progeny that survive, etc., etc., etc. Success requires the ability to adapt to various environments and changing environments, from seed germination to seed production and dispersal Most (but not all) functions of the plant are protein- mediated Most of gene expression is reflected in production of specific proteins and the regulation thereof where when how much spatial temporal quantitative DNA RNA Protein Synthesis and information transfer Genetic information flow and its control
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3 DNA RNA Protein Other Compart- ments and Export Synthesis and information transfer Transport Genetic information flow and its control DNA RNA Protein Genetic information flow and its control Other Compart- ments and Export Synthesis and information transfer Transport Degradation DNA RNA Protein Genetic information flow and its control Other Compart- ments and Export Synthesis and information transfer Transport Degradation Reaction enhanced Reaction inhibited When, where how much?
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4 DNA RNA Protein Genetic information flow and its control Other Compart- ments and Export Synthesis and information transfer Transport Degradation Reaction enhanced Reaction inhibited When, where how much? Alternative splicing
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This note was uploaded on 12/03/2010 for the course ECONOMY Eco 100 taught by Professor Taidat during the Spring '10 term at Hanoi University of Technology.

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HAU16008-03-2 - Mechanisms of Plant Gene Expression Lecture...

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