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Effect of Ammonia and Nitrate on Growth, Photosynthesis, and Ribulosediphosphate Carboxylase Content of Dunaliella tertiolecta
Author(s) -
PAASCHE E.
Publication year - 1971
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1971.tb01445.x
Subject(s) - photosynthesis , dunaliella , nitrate , nitrate reductase , ammonia , botany , oxygen , flagellate , nitrogen , biology , nitrogen cycle , light intensity , chemistry , algae , biochemistry , ecology , physics , organic chemistry , optics
When the marine Chlorophycean flagellate Dunaliella tertiolecta Butcher was grown with short photoperiods of bright light, the use of ammonia rather than nitrate as a nitrogen source led to a 30 % reduction of the doubling time of cell matter. The cell cycle (onset of light to completion of cell division) was shortened by about 10% only. Ammonia‐grown cells possessed a greater capacity for photosynthetic oxygen evolution at light saturation than did nitrate‐grown cells; their content of ribulosediphosphate carboxylase was likewise greater. The faster growth of Dunaliella tertiolecta with ammonia may be partly a consequence of a general increase in net protein synthesis resulting in a greater content of photosynthetic enzymes.