The Qualitative and Quantitative Relationship of Monochromatic Radiation to Sexual and Asexual Reproduction of Pleospora herbarum

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Abstract
Colonies were exposed to monochromatic radiation at 2378A, 2537A, 2803A, 3131A, 3663A, 4046A and 546lA (band width 132A) at in intensities of 100 and 300 [mu]w/cm2. Exposures ranged from 1/50 to 20,000 seconds. Conidia were produced between 2378 and 3663A inclusively, but not at longer wavelengths. Two wavelengths, 2378 and 313lA, appeared to be most effective in inducing conidial formation. Sexual reproduction was stimulated over a similar range of wavelengths and in addition, a few perithecia were produced at 4046A, but not at 546lA. Dosages necessary to stimulate or inhibit sexual and asexual reproduction decreased with decrease in wavelength. Radiation requirements for sexual and asexual reproduction, through fairly similar, showed some marked differences. The location of perithecia in relation to the surface of the medium was related to wavelength and dosage, and as the dosage was increased the perithecia became increasingly submerged in the medium. The radiation requirements for conidial production of P. herbarum are almost identical to those previously reported for Ascochyta pisi and it is suggested that a similar photoactivated reproductive mechanism is involved.

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