Abstract
Some seeds have water-impermeable coverings that prevent water entry into seeds and thereby prevent germination until the impermeability breaks down. Historically, such seeds have been termed “hard” because they do not imbibe water after a day or two and remain hard to the touch whereas nonhard seeds rapidly imbibe and become soft (Assoc. Off. Seed Anal., 1978). This type of physical “coat-imposed dormancy” prevents germination even though water is externally available.
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Egley, G.H. (1989). Water-Impermeable Seed Coverings as Barriers to Germination. In: Taylorson, R.B. (eds) Recent Advances in the Development and Germination of Seeds. NATO ASI Series, vol 187. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-0617-7_16
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DOI: https://doi.org/10.1007/978-1-4613-0617-7_16
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