On the Influence of Ultra-violet Rays upon the Frequency of Nuclear Division in Plants

Takamine, Noboru

doi:10.1508/cytologia.6.444

Cited by 4 publications

(1 citation statement)

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“…The latter used mixed wavelengths only, so there was no evidence that acceleration was produced by the far-UV component. An increased percentage of periblem cells in mitotis in Vicia root tips exposed to mixed radia- tions from 579 to < 238nm was reported by Takamine (1935), but he was possibly observing a secondary effect of the treatment; for it is doubtful whether any far-UV would reach the periblem. The mean generation time of yeast cells treated with 20 J/mZ of 254 nm radiation was reduced by as much as 14 per cent over three generations, according to James and Muller (1961).…”

Section: Introductionmentioning

confidence: 93%

Mitotic Acceleration Induced in Grasshopper Neuroblasts by Small Doses of Monochromatic Ultraviolet Radiation

Carlson

Stephens

1974

Photochem & Photobiology

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Abstract—Neuroblasts of the grasshopper, Chortophaga viridifasciata (DeGeer), in culture were exposed to 4–15 J/m2 of monochromatic ultraviolet radiation in middle prophase and timed to prometaphase (breakdown of the nuclear membrane). At wavelengths 265 and 280 nm the times recorded for the treated cells were significantly less than those for the matched control cells. Wavelength 225 nm produced neither significant acceleration nor deceleration of mitotic rate. Evidence from the present experiment does not implicate any particular chromophore in this response, though similar results of a previous microbeam study of neuroblasts point to the nucleic acid or protein of the nucleolus as the possible effective material.

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Section: Introductionmentioning

confidence: 93%