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Published on Nov 18, 2015
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PRESENTATION OUTLINE
1.
DORMANCY/ PLANT CLADOGRAM
2.
DORMANCY
Period in an organism's life cycle when growth development, and (in animals) physical activity are temporary stopped.
3.
Is a development process in which dormancy (sometimes a dormant state)is induced maintained broken.
4.
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5.
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6.
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.
7.
TYPES OF SEED DORMACY
Physiological
Morphological
Morphophysiological
Physical
Physical & physiological
Chemical
Mechanical
8.
PHYSIOLOGICAL DORMANCY
Nondeep
Intermediate
Deep
9.
MORPHOLOGICAL DORMANCY
Morphology of embryo not developed
Temperate families-apiaceae, rununculaceae
Tropical families -- annonaceae, arecaceae, degeneriaceae, lactoridaceae, monimiaceae, myrsticaceae, winteraceae
10.
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
11.
PHYSICAL DORMANCY
Present in 15 angiosperm families
Large embryos with food reserve in embryo not endosperm
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