Abstract
SummaryFor more than 6 years clonal cultures of Ectocarpus siliculosus from Naples, Italy, have been used for studying problems concerning re production. Three aspects will be discussed here:1, alternation of generations,2, mechanism of sex determination,3, attempts to isolate and identify a sperm-attractive substance.1. Two growth-forms can be distinguished: gametophytes and sporophytes. They differ in their morphology and their reproductive capacity.Gametophytes have been observed in the haploid and diploid nuclear phase. Sporophytes occur in haploid, diploid and tetraploid forms. All these stages are interconnected by a number of processes: fertilization, meiosis, parthenogenesis, spontaneous multiplication of chromosome number and heteroblasty.2. Analysis of the products of meiosis in diploid heterozygous sporophytes shows that sex determination is genotypic. The sex of haploid plants is determined, although in haploid sporophytes it is not expressed directly. Diploid and tetraploid plants can be eith...
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