| Abstract: | Summary In order to study a side of the influence of ultra-violet light on plants, the A. has harvested, 10 days after fertilisation, 1040 plants of Triticum vulgare Vill. and made many groups of them; then he sheared differently the ears and screened them partially from light so as to obtain, from the same subject, treated and untreated grains. Such ears he treated for different times of exposure with the light of a quarzlamp giving almost only ultra-violet rays. For the present, are here reported only results concerning the influence of ultra-violet light upon both germinating energy and power: -
ultra-violet light stimulates the germinating power of grains, born from subjects treated no longer than 240 hours at a distance of 1 m from the lamp; longer treatments abate germinating power; -
ultra-violet light stimulates, the germinating energy of grains born from subjects treated no longer than 120 hours; treatments during 120–240 hours don't notably modify it; treatments of over 240 hours reduce it very much; -
according to the conditions in which this work has been done, a 10 days-irradiation seems to be, under every point of view, for the best. A 71/2 — days irradiation seems to be insufficient, a 121/2 — days one excessive, and hence prejudicial; -
glumes are strong screening-organ for ultra-violet light; -
ultra-violet light gives late appearing effects. Since great difficulties usually occur whenever tests such as the present one are undertaken, the A. proposes some leading ways to previously settle the U.V.-rays dosimetry fit for every plant, in order to avoid wast of time and to get data of general value. |
