Abstract:
:A circadian rhythm of O(2) evolution has been found in Euglena gracilis, Klebs strain Z. The rhythm persists for at least 5 days in constant dim light and temperature, but damps out in constant bright light. The phase of this rhythm can be shifted by a pulse of bright light and the period length is not changed over a 10 C span of growth temperature.The O(2) evolution rhythm is found in both logarithmic and stationary phase cultures, but CO(2) uptake is clearly rhythmic only in stationary phase cultures.The activity of glyceraldehyde-3-phosphate dehydrogenase was not rhythmic as previously reported (Walther and Edmunds [1973] Plant Physiol. 51: 250-258). Carbonic anhydrase activity was rhythmic when the cultures were maintained under a light-dark cycle with the highest enzyme activity coinciding with the fastest rate of O(2) evolution. However, the rhythm in carbonic anhydrase activity disappeared under constant conditions. Changes in the activities of these two enzymes are therefore not responsible for the rhythmic changes in photosynthetic capacity.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Lonergan TA,Sargent MLdoi
10.1104/pp.61.2.150subject
Has Abstractpub_date
1978-02-01 00:00:00pages
150-3issue
2eissn
0032-0889issn
1532-2548journal_volume
61pub_type
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