By Beullens A.
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1986). In a light-dark cycle, fixation of dinitrogen occurred only at night. In constant light, this rhythm persisted for at least 4 cycles. That N2fixationshould be limited to a time when photosynthesis is not functioning has obvious survival value, since the nitrogenase enzyme complex is inactivated by oxygen. A search of other cyanobacteria that fix nitrogen may yield further examples of circadian clocks in cyan obacteria, especially those without heterocysts. The presence of circadian rhythms in prokaryotes as in eukaryotes is of interest in considering the mechanism of the circadian clock.
Sometimes the period becomes slightly longer as the temperature is raised, contrary to what one might expect and one of the things that suggests temperature compensation rather than temperature independence. While light is the dominant phase-shifting stimulus, in a con stant environment with respect to light, temperature pulses can reset circadian rhythms (Fig. 17). As we have seen, the effect of changing the environmental temperature for times long relative to 24 h is small but almost always measurable.
Ions must both enter and leave extensor andflexorcells to make possible the cyclic move ments of the leaves or leaflets. The movement of potassium ions (K+) in the pulvinus is more complicated than a simple exchange betweenflexorand extensor regions (Satter, 1979). Other ions in addition to K+, in particular H+ and Cl " (Iglesias and Satter, 1983; Schrempf and Mayer, 1980), may also change location 33 Circadian Rhythms in Angiosperme Tertiary pulvinus Secondary pulvinus Pinna Pinnule Primary pulvinus Fig.