Pigments, polysaccharides, and photosynthetic products of Phaeosaccion collinsii

Abstract

1971. Pigments, polysaccharides, and photosynthetic products of Phaeosaccion colli~rsii. Can. J. Bot. 49: 1067-1074. Zoospores of Phaeosaccion collinsii averaged 70 p3 and contained total N 2.24 pg, DNA 0.19, and chlorophyll a 0.62 pg per spore. In addition, chl c, "cis"-8-carotene, fucoxanthin, and violaxanthin were principal pigments and a minor unidentified carotene was present.Photosynthetic rates of zoospores were 0.37 X 10-l2g C per spore per hour, or 0.59 mg C per mg chl a per hour at 5". The principal products of photosynthesis were mamitol and a water-soluble glucan.Carbohydrates in the thalli were fractionated and evidence is presented for the presence of a laminarinlike glucan, mamitol, tnyo-and scyllo-inositols. Alginate was absent.The relationship of P. colli~uii to other algal groups is discussed and it is concluded that its affinities lie with the Chrysophyceae.

Immunogold-labeling analysis of alginate distributions in the cell walls of chromophyte algae

“…Based on fine-structural Phycological Research 1999;47: 53-60 Immunogold-labeling analysis of alginate distributions in the cell walls of chromophyte algae features, especially those of flagellar root systems, Chrysomeridales including Giraudyopsis stellifera Dangeard were suggested to be a direct ancestor of the Phaeophyceae (O'Kelly and Floyd 1985;O'Kelly 1989). However, the absence of alginates in Phaeosaccion collinsii Farlow (Craigie et al 1971) does not support this notion, and furthermore, recent molecular studies have indicated a closer relationship to the Phaeophyceae and Xanthophyceae (Ariztia et al 1991;Andersen et al 1993Andersen et al , 1998.…”

In situmeasurement of zoospore release and seasonality of reproduction inEcklonia maxima(Alariaceae, Laminariales)

“…Calculating from this, the annual spore production of an E. maxima sporophyte will have a volume of only 5.27 cm 3. Also, if we assume that the relationship between volume and carbon content of unicellular plankton organisms (Holm-Hansen, 1969) holds for kelp zoospores (this has been previously used for zoospores of the Chrysophyte Phaeosaccion collinsii Farlow by Craigie et al, 1971) we can estimate that the 9.36 x 1017 spores per year contain 3.66 x 107 gC = 36.6 tonnes of carbon produced per year per southern Benguela region (or 0.17 tonnes of carbon per year per km of coastline). Using the kelp-production data put forward by Jarman & Carter (1981) we estimate that for a total 21,978 tonnes of carbon produced by Ecklonia plants in the southern Benguela region annually, measured as growth increment, a further 36.6 tonnes C is released into the system as zoospores.…”

Photosynthesis Research in Canada from 1945 to the early 1970s

“…Craigie and McLachlan (1964) showed that glycerol accumulated in the marine green alga Dunaliella tertiolecta photosynthesizing under salinity stress. Photosynthetic products reported included a suite of galactosyl glycerols in red algae (Majak et al 1966;Craigie et al 1968), unusual cyclitols in red algae and chrysophytes (Ramanathan et al 1966;Craigie 1969Craigie , 1974Laycock and Craigie 1970;Craigie et al 1971) and mannitol in prasinophycean and chrysophycean algae . The effects of carboxylic acids on growth and photosynthesis of Haematococcus pluvialis was reported by McLachlan and Craigie (1965) as was photosynthesis in algae containing chlorophyll b (McLachlan and Craigie 1967).…”