Carbon economy and nutrition of the alloparasitic red alga Harveyella mirabilis |
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Authors: | B P Kremer |
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Institution: | (1) Seminar für Biologie und ihre Didaktik, Universität zu Köhn, D-5000 Köln 41, Federal Republic of Germany |
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Abstract: | Rhodomela confervoides (Huds.) Silva (Ceramiales: Rhodophyta) infected with the alloparasitic Harveyella mirabilis (Reinsch) Reinke (Cryptonemiales: Rhodophyta) was investigated with particular regard to rates of carbon fixation, patterns of soluble and insoluble assimilates, and transfer of reduced carbon from the photoautotrophic basiphyte to the fully heterotrophic epiphyte by means of 14C-labelling experiments. Gross carbon input by photosynthesis in Rh. confervoides accounted for about 53 g Cd-1 when based on a biological unit (average individual of 200 mg fresh weight). Some 3% of the remaining net carbon gain (equivalent to about 0.7 g Cd-1) was transferred from Rh. confervoides to its alloparasite, H. mirabilis (biological unit 0.5 mg fresh weight). Chromatographic examination showed that soluble 14C was translocated to and stored by H. mirabilis as mannosidoglycerate (=digeneaside) and probably a variety of amino acids. A certain proportion of soluble radiocarbon imported is converted by H. mirabilis to glycerolgalactoside (=floridoside). The bulk of imported 14C was recovered from the polymeric fraction, mainly from floridean starch. |
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