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• W2034752885 abstract "Light is required for the germination of spores of Matteuccia struthiopteris. Histochemical studies show that dormant spores contain no starch, but have an abundance of storage protein granules. Starch accumulates in the numerous chloroplasts of the spore on exposure to light and becomes gradually more extensive. Protein granules disappear as germination progresses. Following this, the centrally located nucleus migrates toward the proximal spore face. Concomitant with the nuclear migration, an increase of cytoplasmic RNA surrounding the nucleus occurs. An equal nuclear division and unequal cell division give rise to a 2‐celled gametophyte consisting of a large prothallial cell and smaller rhizoidal cell. A new peripheral wall forms around the entire protoplast at the time of nuclear migration, while a transverse wall forms after nuclear division. The rhizoid emerges through the split raphe along the proximal spore face; it is rich in cytoplasmic RNA but contains very few chloroplasts and little starch. Electron microscopy of the 2‐celled stage revealed a greater concentration of mitochondria, Golgi bodies, and a more extensive endoplasmic reticulum in the rhizoid than was found in the prothallial cell, which, however, was far richer in chloroplasts and lipid bodies. As the rhizoid elongates and becomes more vacuolated, cytoplasmic RNA decreases as cytoplasmic protein increases. The rhizoid undergoes no cell divisions, while the prothallial cell retains the potential for further cell division. The possible significance of the distribution of storage products, cell organelles, and other cell components were considered in relation to the non‐equational cell division and differentiation of the 2 cells." @default.
• W2034752885 created "2016-06-24" @default.
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• W2034752885 date "1965-01-01" @default.
• W2034752885 modified "2023-10-09" @default.
• W2034752885 title "SPORE GERMINATION AND DEVELOPMENT OF THE YOUNG GAMETOPHYTE OF THE OSTRICH FERN (MATTEUCCIA STRUTHIOPTERIS)" @default.
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• W2034752885 doi "https://doi.org/10.1002/j.1537-2197.1965.tb06760.x" @default.
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