(brownseed paspalum) seeds are dormant for several months after maturity. This study was conducted to determine causes of dormancy in seeds ...
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www.jstor.org/stable/3672086
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Dormancy is poorly understood in terms of what causes it although it is likely that very many mechanisms exist, most of them probably chemical in nature. Some responsible compounds have been isolated, but in most cases, how they work is not...
http://wiki.answers.com/Q/What_causes_seed_dormancy
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In nature, exposure to high temperature or extreme fluctuating temperatures is the most likely cause of dormancy release (Geneve, 2003). Physical dormancy is found in approximately 15 plant families, including Fabace-ae, Malvaceae, Cannaceae, Geraniaceae, and Convolvulaceae (Baskin et al., 2000).
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www.uky.edu/Ag/HLA/Geneve/research/PDF%20files/ippsdorm...
www.uky.edu/Ag/HLA/Geneve/research/PDF%20files/ippsdormancy%20misconceptions.pdf
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Prevention of water uptake by the seed coat is a common cause of seed dormancy in families found in arid and semiarid regions, especially among legumes, such as clover (Trifolium spp.) and alfalfa (Medicago spp.). Waxy cuticles, suberized layers, and lignified sclereids all combine to restrict the penetration of water...
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www.plantphys.net/article.php?ch=t&id=8
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Seed - Wikipedia, the free encyclopedia
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A seed (/ˈsiːd/), referred to as a kernel in some plants, is a small embryonic plant enclosed in a covering called the seed coat, usually with some stored food. It is the product of the ripened ov...
en.wikipedia.org/wiki/Seed
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Cytokinins (E1 -E6), gibberellins (X1 -X6) and inhibitors (R1 -R2) were present in low concentrations in dormant fruits and the dormancy was not due to deficiency of these hormones in the fruit. The factor playing a major role in the dormancy mechanism of fruit appear to be auxins (a1 -a5).
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www.actahort.org/books/321/321_42.htm
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Measurements of ethylene production taken at 15 C, following periods of after-ripening in moist soil at either 5 or 25 C, indicated that endogenous production was unlikely to be a main cause of dormancy breakage in this species.
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www.plantphysiol.org/cgi/content/abstract/67/2/358
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Seed coats were removed from 150 seeds of each seedlot in order to determine the cause of dormancy. Some species appear to have a dormancy totally imposed by the seedcoat, while others seem to have a combined seedcoat and embryo dormancy.
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cropandsoil.oregonstate.edu/seed-ext/Pub/1990/page29_2....
cropandsoil.oregonstate.edu/seed-ext/Pub/1990/page29_2.html
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For example it was concluded that the hardness of the seed coat was the main cause of dormancy in Iris lorteti (Iridaceae), in which radicle protrusion was found to require a pressure of up to 135 atm (1368 newtons of force/cm2).
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www.rtbg.tas.gov.au/index.aspx?base=314
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