Biology 2217B Lecture Notes - Lecture 1: Clematis, Convolvulaceae, Morning Glory
3 Feb 2016
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Phytochromes: cryptochrome (when you should wake up ect. ) Darwins experiment a grew in direction to light, b cut off tip grew straight, c opaque cap, d glass tip so it grew toward light, e body cap still grew toward light therefore photoreceptors in tips of seedlings. Maryland mammoth: tabacco plant never turn off leafkeeps growing but never flowers in the dark it stops growing but then flowers (photoperiod: sense light) photoperiodism: sense lengths of night and day ex. Chrysanthemums (bloom in the fall) is a short day plant short day ex is spinach. Use red and far- red light for photosynthesis. Sense blue light to regulate circadian rhythm, control hypocotyl elongation, stomatal opening, and phototropism. Nastic movement: direction of movement is not dependent of the direction of stimulant. Mimosa leaves folding (adaptation) can poss prevent water loss subtropical or tropical (florida) protection: folding makes the leaves look unappealing to predators pulvinous looses water allowing leaf to close.
