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How long is the lifespan of Asarum seeds, and how many years can they be stored?
The lifespan of Asarum seeds is very short. Naturally matured seeds have a very high germination rate, reaching 99%. However, when stored under dry conditions at room temperature for 20 days, the germination rate drops to 81%; at 40 days it drops to 29%; and at 60 days it is only 2%. This shows that when Asarum seeds are stored dry indoors after harvest, the germination rate gradually decreases as the storage period lengthens, and the dry storage period is only 60 days. Because Asarum seeds cannot be stored dry indoors, they should be sown immediately after harvest or treated by sand stratification.
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How to observe the life history of sexual reproduction in Gastrodia elata
The seeds of Gastrodia elata are composed of an embryo and a single layer of cells, with no endosperm. The seeds are very small, averaging 0.69 mm in length and 0.14 mm in width, with the embryo averaging 187 micrometers in length. When sown in early June, half a month later the embryo cells begin to differentiate, the embryo diameter increases noticeably, the middle of the seed swells, the suspensor is dark in color, and the newly differentiated cells at the apex of the embryo are light in color; then the seed coat ruptures at this end, and the embryo breaks through the seed coat. July happens to be the rainy season in the production areas, with soil temperature around 25°C and soil moisture around 60%. The Gastrodia elata seeds germinate one after another, and 26 days after sowing they grow to a length of
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