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Dormancy is a period in an organism's life cycle when growth, development, ... Seed dormancy is desired in nature, but the opposite in the agriculture field. This is ...
Aestivation (Latin: aestas (summer); also spelled estivation in American English) is a state of animal dormancy, similar to hibernation, although taking place in the summer rather than the winter. Aestivation is characterized by inactivity and a lowered metabolic rate, that is entered in response to high temperatures and arid conditions. [ 1 ]
Photoblasticism is a mechanism of seed dormancy. Photoblastic seeds require light in order to germinate. [2] Once germination starts, the stored nutrients that have accumulated during maturation start to be digested which then supports cell expansion and overall growth. [3]
True dormancy or inherent (or innate) dormancy is caused by conditions within the seed that prevent germination even if the conditions are favorable. [7] Imposed dormancy is caused by the external conditions that remain unsuitable for germination [8] Seed dormancy can be divided into two major categories based on what part of the seed produces dormancy: exogenous and endogenous. [9]
Thus dormancy is a state of the seed, not of the environment. [34] Induced dormancy, enforced dormancy or seed quiescence occurs when a seed fails to germinate because the external environmental conditions are inappropriate for germination, mostly in response to conditions being too dark or light, too cold or hot, or too dry.
Many seed species have an embryonic dormancy phase and generally will not sprout until this dormancy is broken. [ 1 ] The term stratification can be traced back to at least 1664 in John Evelyn 's Sylva, or A Discourse of Forest-Trees and the Propagation of Timber , [ 2 ] where seeds were layered (stratified) between layers of moist soil and the ...
Trillium grandiflorum in the foreground and the smaller Thalictrum thalictroides in the background are both spring ephemerals of North American deciduous forests. An ephemeral plant is a plant with a very short life cycle or very short period of active growth, often one that grows only during brief periods when conditions are favorable.
The start of dormancy can be seen in perennial plants through withering flowers, loss of leaves on trees, and halting of reproduction in both flowering and budding plants. [ 19 ] Perennial species may produce relatively large seeds that have the advantage of generating larger seedlings that can better compete with other plants.