angiodevelop213-page6

angiodevelop213-page6 - favorable for growth Dormant seeds...

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Flowering Plants: Early Growth and Development - 6 Dispersal by Consumption Seeds with Eliasomes Dispersal by Attachment Dispersal is still a chance event. Seed must land in an area favorable to growth, and ideally at a time favorable for growth. Germination and Seedling Establishment Many seeds mature at a time unfavorable for growth. Some essential condition for growth may be missing, such as warm temperatures or moisture. In areas where environments change seasonally, and when seeds mature at a "bad" time, most seeds have a built-in delay in germination, called dormancy. In dormancy, the seed experiences and "waits out" the bad time, and germinates when the surroundings are
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Unformatted text preview: favorable for growth. Dormant seeds can remain viable for extended periods of time; the metabolic rate is very diminished, the seed coat protects and the moisture content of the seed is excessively low. Dormant seeds monitor their surroundings in a variety of ways, chemical, mechanical and temporal. • For some, the seed coat must be exposed to abrasion, to physically wear it away. • Others undergo changes in hormone concentrations, notably abscisic acid and gibberellins. • Many seeds break dormancy in response to environmental triggers such as temperature changes, fire, drought or light exposure....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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