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Action spectra for the blue and near ultraviolet reversible photoreaction in the induction of fungal conidiation
Author(s) -
Kumagai Tadashi
Publication year - 1983
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.1399-3054.1983.tb02770.x
Subject(s) - conidiation , action spectrum , conidium , darkness , blue light , ultraviolet light , phototropism , biology , cryptochrome , spore , chemistry , botany , microbiology and biotechnology , photochemistry , mutant , materials science , optoelectronics , biochemistry , gene , circadian clock
Induction of conidiation in Alternaria tomato (Cke.) Weber and Helminthosporium oryzae V. Breda de Haan was repeatedly controlled by ulternating doses of near ultraviolet light and blue light. These fungi did not form conidia in total darkness. However, when dark‐grown colonies were exposed to near altraviolet light, conidiophore formation was induced, and conidia were then produced upon return to darkness. Conidiation was inhibited by blue light applied immediately after near ultraviolet light. Furthermore, the final response depended on the last kind of light received. The action spectrum for induction of conidiation showed a peak near 300 nm with a shoulder between 310 nm and 330 nm, as is common in photoconidiation of various fungi. The action spectrum for the reversion of induction of conidiation showed a peak near 447 nm with a shoulder between 400 nm and 440 nm, one minor peak around 478 nm and another one near 385 nm. This is very similar to the spectrum for the ubiquitous blue light receptor (cryptochrome).