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It is called Leaf Senescence. Senescence is the process by which a biological organism crosses into old age. Everything that lives reaches senescence. Senescence it what causes us to get old and get those wonderful laugh lines that we very rarely laugh about.
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www.thisgardenisillegal.com/2007/11/how-trees-get-naked...
www.thisgardenisillegal.com/2007/11/how-trees-get-naked-leaf-senescence-and-why-leaves-fall-off-a-tree.html
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Leaf senescence although deteriorative in nature, has been recognized as the last phase of the organ’s development, a highly ordered process regulated by genes known as senescence associated genes (SAGs). Till now, more than 30 SAGs have been isolated, cloned and characterized.
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www.ias.ac.in/currsci/sep25/articles19.htm
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During the process of leaf senescence, chlorophyll and photosynthetic proteins are degraded ... leaf sugars can increase during leaf senescence (Crafts- ...
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www.plantphysiol.org/cgi/reprint/116/1/329.pdf
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Gene expression during leaf senescence ... A recent, genome-wide study shows that the transcriptional program underlying leaf senescence is active and complex, reflecting the activation of more than 2,000 genes in Arabidopsis, with gene products involved in a broad spectrum of regulatory, biochemical and cellular events.
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genomebiology.com/2004/5/3/212
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The European Bioinformatics Institute ... The process that occurs in a leaf near the end of its active life that is associated with the dismantling of cell components and membranes, loss of functional chloroplasts, and an overall decline in metabolism. ... GO:0010149 senescence...
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www.ebi.ac.uk/ego/DisplayGoTerm?id=GO:0010150
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Leaf senescence and associated changes in redox components were monitored in commercial pea (Pisum sativum L. cv. Phoenix) plants grown under different nitrogen regimes for 12 weeks until both nodules and leaves had fully senesced.
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jxb.oxfordjournals.org/cgi/content/abstract/57/8/1735
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We examined the effects of elevated CO2 concentration ([CO2]) on leaf demography, late-season photosynthesis and leaf N resorption of overstory sweetgum (Liquidambar styraciflua L.) trees in the Duke Forest Free Air CO2 Enrichment (FACE) experiment.
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www.medscape.com/medline/abstract/12533305
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After an introduction to leaf color change, this essay looks at two theories of color change and leaf senescence, competition versus enhancement. Next, we will briefly look at the full-scale dynamics of interrelationships between external and internal factors to explain how leaves turn brilliant colors in autumn.
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www.yale.edu/edex/new_haven_trees/Tree-colors-final.htm...
www.yale.edu/edex/new_haven_trees/Tree-colors-final.html
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[c] Leaf senescence is a programmed event responding to a wide range of external and internal signals. It requires de novo gene expression and protein synthesis and is controlled in a tightly regulated manner.
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www2.warwick.ac.uk/fac/sci/whri/research/plantsenescenc...
www2.warwick.ac.uk/fac/sci/whri/research/plantsenescence/arabidopsisleafsenescence
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