Lecture 9 - 03:28 Continuelecture8 FallColors:

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03:28 Continue lecture 8 Fall Colors:  Conditions that favor especially good leaf color Rainy period early September retards early leaf fall Clear, bright warm days increases sugar production Low, but not freezing temps at night Cool nights favor starch to sugar conversion  Inhibits sugar movement out of leaves Low soil moisture inhibits nitrogen uptake and sugar movement  Pigments Anthocranins – water soluble  Red Blue Violet Betacynins  Red  Carotenoids – oranges in veggies  Red Orange Yellow
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Brown  Flavonols  Ivory Yellow  Protect from bright sunlight  Maples are colorful Sugar maple – has highest color  Ginkgo –take longer to turn but then fall off after change Japanese maple – take longer to change but has most vibrant colors  Virginia creeper  White ash – purple white ash Where do plants get their mass from? Nutrients from soil uptake? Water they are watered with? Sunlight?  Photoperiodism Biological response to change in the proportion of light and dark in a 24 hour cycle  Short-day plants – gets flower buds   photoperiodic response  Long-day plants – no flower buds  Dependent on darkness Short-day plants – needs long nights of no light 
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poinsettias (only flower if get 64 days of short-day sunlight) Long-day plants  - needs long days of sunlight  Day-neutral plants – plant needs to reach a certain size and then can flower  Photoperiodism Mechanism Photoreceptors (phytochrome)
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This note was uploaded on 02/17/2012 for the course HORTI 120 taught by Professor Paterson during the Fall '11 term at Wisconsin.

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Lecture 9 - 03:28 Continuelecture8 FallColors:

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