Abstract:
:Dark H(2) metabolism was studied in marine and fresh water red algae, the green alga, Chlamydomonas, and mosses. A time variable and temperature-sensitive anaerobic incubation was required prior to H(2) evolution. H(2) evolution was sensitive to disalicylidenepropanediamine. An immediate H(2) uptake was observed in these algae. Immediate dark H(2) uptake but no evolution was observed in the mosses.A cell-free hydrogenase preparation was obtained from anaerobically adapted Chlamydomonas reinhardii by means of sonic oscillation. The hydrogenase was not sedimented at 100,000g. It catalyzed the reduction of methylene blue, p-benzoquinone, NAD, NADP, but not spinach ferredoxin. H(2) evolution was noted with dithionite and with reduced methyl viologen as donors but not with reduced spinach ferredoxin. Similarly, hydrogenase activities were not affected by disalicylidenepropanediamine. The pH optima for H(2) evolution and for H(2) uptake were 7.2 and 7.5 to 9.5, respectively. Extracts prepared from the anaerobically adapted red alga, Chondrus crispus, and the moss, Leptobryum pyriforme, consumed but did not evolve H(2). Uptake was slightly stimulated by methylene blue. It is proposed that red algae and mosses appear to metabolize H(2) by a different pathway than Chlamydomonas.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Ben-Amotz A,Erbes DL,Riederer-Henderson MA,Peavey DG,Gibbs Mdoi
10.1104/pp.56.1.72subject
Has Abstractpub_date
1975-07-01 00:00:00pages
72-7issue
1eissn
0032-0889issn
1532-2548journal_volume
56pub_type
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