01:119:101 Lecture Notes - Lecture 11: Vernalization, Germination, Meristem
5 Aug 2016
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Seed germination, flowering, and the onset and breaking of bud dormancy are all stages that occur at specific times of the year o. Photoperiodism: physiological response to a photoperiod; actually controlled by night length. Short-day plants: require light period shorter than a critical length to flower (late summer, fall, winter) Long-day plants: require light period longer than a critical length to flower (late spring, summer) Day-neutral plants: unaffected by photoperiod; flower when they reach a certain maturity regardless of day length o. Number of hours in the critical night length is specific to each plant species o. Red light is the most effective color interrupting the nighttime portion of the photoperiod o. Some plants bloom after a single exposure to the photoperiod required for flowering. Other species need several successive days of the appropriate photoperiod. Some only respond to a photoperiod if they"ve been previously exposed to some other environmental stimulus o flowering o.
