DORMANCY/ PLANT CLADOGRAM

DORMANCY

• Period in an organism's life cycle when growth development, and (in animals) physical activity are temporary stopped.

Is a development process in which dormancy (sometimes a dormant state)is induced maintained broken.

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ORGANIC SEED DORMANCY

• Endogenous - embryo characteristics prevents germination-epicotyl, hypocotyl, radical.
• Exogenous - characteristics of structure : seed coat, fruit walls, including endosperm or perisperm prevents germination.

TYPES OF SEED DORMACY

• Physiological
• Morphological
• Morphophysiological
• Physical
• Physical & physiological
• Chemical
• Mechanical

PHYSIOLOGICAL DORMANCY

• Nondeep
• Intermediate
• Deep

MORPHOLOGICAL DORMANCY

• Morphology of embryo not developed
• Temperate families-apiaceae, rununculaceae
• Tropical families -- annonaceae, arecaceae, degeneriaceae, lactoridaceae, monimiaceae, myrsticaceae, winteraceae

MORPHOPHYSIOLOGICAL DORMANCY

• Underdeveloped embryos
• Embryo growth and dormancy break required
• Embryo grows first than dormancy broken or both at the same time
• Very worm, moist and cold stratification periods
• Viburnum- epicotyl dormancy, warm for radical then cold for epicotyl
• Fraxinus excelsior, magnolia cuminata

PHYSICAL DORMANCY

• Present in 15 angiosperm families
• Large embryos with food reserve in embryo not endosperm