Photoperiodism- physiological response to day/night length

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Presentation transcript:

Photoperiodism- physiological response to day/night length ex: flowering short-day plants - requires shorter period of time exposed to light to flower ex: poinsettias, chrysanthemums (late summer, fall, winter) long-day plants - requires longer exposure to light to flower ex: spinach, radish, lettuce (late spring, early summer) day-neutral plants - unaffected by photoperiod ex: dandelions, tomatoes, rice (flower at certain maturity point regardless of time of year)

*control systems allow plants to cope with environmental stressors ex: stomata closing - conserve water in drought roots with air tubes to get O2 if water logged production of compatible salts to respond to salt increase heat-shock proteins to protect other proteins during heat stress lipid composition adjustment in cold physical & chemical defense to fight herbivory salicylic acid - used against pathogens

Signal transduction pathways: -hormones stimulate cells by binding to specific receptors (reception) -reception triggers second messengers to be produced within cell (transduction) -2nd messengers activate a chain of events that mobilize the cell’s specific response (induction)