Chromosome counts of bispore and carpospore germlings of Gelidium pristoides, during mitotic metaphase, were n = 13 -- 17, 2n = 28 --33, respectively. This confirms that bispore production in the species is the product of normal meiosis in the sporophyte generation, and analogous to tetraspores seen in most other members of the Gelidiales. Introduction Reproductive structures of the intertidal agarophyte Gelidium pristoides (Turner) Kuetzing are typical of the genus except for the production of bispores (rather than tetraspores) in the sporophyte generation. Previous observations suggested that these bispores were the product of normal meiosis (Carter 1985). The purpose of the present study was to confirm this by comparing chromosome numbers in germlings derived from bispores and carposopres. Material and Methods Fertile bisporophytic and carposporic fronds (collected from Dalebrook in the Cape Peninsula during February and March 1986) were suspended over glass slides in petri-dishes containing millipore-filtered seawater (pore size = 0.45 ). The following day the fronds were removed, and the released spores allowed to germinate to the 1 --4 cell stage. The germlings, which by now had become attached to the glass slides, were fixed in 3 :1 alcohol/acetic acid for an hour, thoroughly washed in
Botanica Marina – de Gruyter
Published: Jan 1, 1993
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