Development, reproductive morphology, and cytology of Halosaccion glandiforme (Gmelin) Ruprecht (Rhodophyceae, Palmariales) Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/n296x210v

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  • Halosaccion glandiforme, a member of the family Palmariaceae, is a common macrophyte found in the high to middle intertidal zones of the north temperate Pacific Ocean. Plants were grown in culture from spores and the lift history was critically examined by the use of scanning EM and light microscopy. H. glandiforme exhibits a life history similar to that of Palmaria palmata. A mature tetrasporangium produces four spores which will germinate to form two male and two female gametophytes. The male gametophytes grow to maturity and become macroscopiclly similar to the tetrasporophyte in about eight months. The female gametophyte produces a carpogonium with trichogynes following the first division. Fertilization is by spermatia from a male plant of the previous generation, as male plants of the present season need time to mature. Spermatangia are formed in a continuous layer over the surface of the mature male gametophytes and spermatia are released in great quantities. One spermatium will adhere and fuse to a trichogyne, and fertilization occurs. The carposporophyte is absent, the new tetrasporophyte will develop from the fertilized carpogonium, it growth eventually will obliterate the young female gametophyte, and develop into a mature tetrasporophyte over a period of approximately eight months. The unusual diphasic life history of this rhodophyte suggests that it has developed a new strategy to compensate for non-motile spermatia by producing immediately mature female gametophytes, and eliminating the delay required to develop a carposporophyte stage.
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