PBIO 1114 Study Guide - Midterm Guide: Symmetry In Biology, Plant Reproductive Morphology, Multiple Fruit
3 May 2016
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$ photoperiod- amount of light on a given day is predictable. $ the flowering is controlled by length of dark period: day-neutral- roses, tomatoes, short-day, long-day, intermediate-day- sugarcane. $ far red light is present day and night. $ phytochrome pigment is interconvertible: pr: phytochrome red. Pr is in higher abundance in short day. Seeds need red light to germinate: pfr: phytochrome far red. Pfr is the active form of the pigment and it induces/inhibits hormones. Pfr is in higher abundance in long day. Pr and pfr are even in intermediate day. Senescence- genetically programmed death of a plant or plant part- turning of leaves o. Dormancy involves structural and chemical changes to prepare the plant like cells making sugars and amino acids to be antifreeze, buds covered by thick, protective bud scales. Peduncle is the stalk of the flower like petiole. Receptacle is the region of flower where the parts of the flowers are o o o attached.
