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Over time, seeds lose viability, which is the ability to initiate metabolic activity, cellular growth, and germination. Seeds have many cells and tissues that die over time, [1] and these deaths can be delayed or increased by environmental conditions the seed experiences. Very generally, small seeds, especially from weedy species and annuals ...
Claviceps purpurea has been known to humankind for a long time, and its appearance has been linked to extremely cold winters that were followed by rainy springs. [citation needed] The sclerotial stage of C. purpurea conspicuous on the heads of ryes and other such grains is known as ergot. Sclerotia germinate in spring after a period of low ...
Dormancy should not be confused with seed coat dormancy, external dormancy, or hardheadedness, which is caused by the presence of a hard seed covering or seed coat that prevents water and oxygen from reaching and activating the embryo. It is a physical barrier to germination, not a true form of dormancy (Quinliven, 1971; Quinliven and Nichol ...
The results of a germination test are commonly expressed as germinative capacity or a germination percentage, which is the percentage of seeds that germinate during a period of time, ending when germination is practically complete. During extraction and processing, white spruce seeds gradually lost moisture, and total germination increased.
For most plants species the radicle dies some time after seed germination, causing the development of a fibrous root system, which lacks a main downward-growing root. Most trees begin life with a taproot, [ 3 ] but after one to a few years the main root system changes to a wide-spreading fibrous root system with mainly horizontal-growing ...
Once the seeds have ripened, its color brown and texture papery, they are immediately sown in a cold frame in deep, moist, fertile soil. Though the plants can grow under semi-shade or full-shaded conditions, the seeds require light for it to germinate. In addition, since this is a perennial plant, seeds are not
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