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Conidiation was not induced by this oxygen-deficient atmosphere without near-UV radiation. Conidiation was stimulated only slightly by O2 deficiency for 1 h either before or after irradiation with near-UV radiation. Exposure to blue radiation immediately after near-UV radiation suppressed induction of conidiation irregardless of oxygen tension. Conidiation was also suppressed by anaerobiosis for 24 h irrespective of light irradiation. In this connection, it has been found that photoreduction of PB(ox) by the cooperative action ofPNUV and near-UV radiation under anaerobic conditions was much larger than that under aerobic conditions and, moreover, PB(red) could be oxidized by molecular oxygen [6, 7].

Near-UV Effects and Photoreactivation Photoreactivation of UV-inactivated cyanobacteria and their viruses has long been reported. Blue light and near-UV (black) light were active in the reactivation of UVinactivated Agmenellum quadruplicatum [45], Plectonema boryanum [37, 47], and Fischerella muscicola [37]. An action spectrum reported for the photoreactivation of A. quadruplicatum showed a sharp maximum at around 430 nm (Fig. 2a; [45], cf. [44]). In this organism, no photoreactivation was found at wavelengths above 500 nm.

1 300 . 0 ~100 z . --'---'---'- when it is blue, conidiation is inhibited and conidiophores dedifferentiate into "sterile" ones. These two light effects can be repeatedly reversed. This kind of antagonistic action in conidial development was not found in any stage with the exception of conidiophore maturation until 1981. This article deals with the role of the mycochrome system in the induction of conidiation. us irradiation with these two lights, the other by alternating exposure to each light [8].

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