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A Study on Heterosis in Diploid Gametophytes of the Marine Red Alga Gracilaria tikvahiae

An attempt was made to detect heterosis in the marine red alga Gracilaria tikvahiae by taking ad van tage of a recently described mutation that results in bisexual gametophytes of this usually dioecious species. Completely homozygous diploid gametophytes were obtained by self-fertilization of the haploid bisexual gametophytes, and these inbred lines were compared with heterozygous diploid gametophytes from crosses between different bisexual clones. In the experiment, 5 haploid bisexual lines, the corresponding homozygous diploids, and 20 different heterozygous dipolids, were cultured in the laboratory and in tanks of seawater in a greenhouse. Tip elongation rates (for plants in culture) and specific growth rates (for plant biomass accumulation in tanks) were measured and compared for all the lines. No heterosis was detected in the experiment.