By M. S. Kritsky (auth.), Prof. Dr. Horst Senger (eds.)

Four years in the past The Blue mild Syndrome used to be released because the continue­ ings of the 1 st foreign convention at the impression of Blue gentle in crops and Microorganisms. as a consequence the curiosity during this interesting and transforming into box of re­ seek has extra elevated, as is mirrored through a number of courses. Blue mild results disguise one of these huge spectrum of organisms, responses and techniques that conversation between scientists with backgrounds in biology, biochemistry, and biophysics is especially important. those evidence not just justified, yet demanded calling the "Blue mild relatives" jointly back. even with many fmancial difficulties, the second one confer­ ence attracted 113 energetic contributors from 19 nations. The second foreign convention at the impact of Blue mild in crops and Microorganisms was once held in July 1984, just like the first on the college of Marburg. The organizer may back depend on the aid of the overseas Advisory Committee (W. Briggs, Stanford; M. Furuya, Tokyo; J. Gressel, Rehovot; S. Miyachi, Tokyo; W. Rau, Miinchen; J. Schiff, Waltham; P .-S. music, Lubbock). The very beneficiant monetary as­ sistance from the DFG and the aid of the Philipps-Universitat Mar­ burg and its Sonderforschungsbereich "Zellenergetik and Zelldifferen­ zierung" have been the necessities to organizing the convention. the current ebook comprises fifty six unique papers. The partitioning into 8 chapters is usually an issue. The grouping of alternative points of the papers into those chapters has no longer regularly been noticeable, in order that one or the opposite contribution may be able to slot in one other chapter.

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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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