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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.
The Tetrazolium Chloride (TZ) test, often called the quick germination test, is a chemical test used to determine seed viability, and results are usually available within 24 to 48 hours The TZ test differs from a germination test in that the TZ test can give you an early and quick snapshot of seed viability but is not a replacement for the more comprehensive seed germination test.
Toggle the table of contents. Lela Viola Barton. 4 languages. ... Viability of seeds of Theobrama cacao L. Contrib. Boyce Thomp. Inst. 23. 109–122. - (1966a ...
Seed vigor is a measure of the quality of seed, and involves the viability of the seed, the germination percentage, germination rate, and the strength of the seedlings produced. [ 47 ] The germination percentage is simply the proportion of seeds that germinate from all seeds subject to the right conditions for growth.
Cultivated E. novogranatense var. novogranatense produces abundant seed and is easy to propagate. Seed viability decreases rapidly. Germination percentages of E. coca and E. novogranatense seed were found to decrease from around 95% and 89% directly after harvesting to 29% and 0%, respectively, after 24 days of storage at 4 m (13 ft). Coca ...
White spruce seed can be tested for viability by an indirect method, such as the fluorescein diacetate (FDA) test [42] or ‘Ultra-sound'; [25] or by the direct growth method of ‘germination'. Samples of white spruce seed inspected in 1928 varied in viability from 50% to 100%, but averaged 93%. [43]
The seeds exposed to long-term preservation are tested for viability and biochemical changes. Seed samples with low seed viability or with insufficient seed amount are forwarded for regeneration. The Laboratory provides seed samples for breeding, research and education. [citation needed]
D. Landreth Seed Company catalog, 1917. Catalogs featured the D. Landreth Seed Company's test fields touting that seeds were fresh because they were grown themselves, any unsold stock at the end of the planting season was burned, and seed packages were labeled with dates ensuring seed viability.