Effects of Near Ultraviolet and Green Radiations on Plant Growth.

Test Systems. Tagetes erecta L., Dwarf Pigmy French Marigold (Burpee 4166) was planted in soil in polyethvlene boxes; radiation treatments were started immediately. Impatiens Balsamina L.. Holsti Hybrid (Burpee 4107) and Lycopersicon esculenturit Mill., Rutgers (Burpee 5061) were similarly grown; radiation treatments were started when the seedlings were 1 cm tall. One week after planting, the seedlings were thinned for uniformity. Day temperatures ranged from 230 to 260 and dark temperatures ranged from ]9° to 230. Experiments were terminated 1 month after planting. Experiments were repeated at least once. ChlamArdomontas reinhardti Dang. was grown in Trainor's I-N medium (19) at 200, cells were washed 3 to 4 times in water and used to inoculate 10 ml of medium in 50 ml flasks. Five cultures for each variable were incubated on a rotary shaker at 100 cycles per minute for 96 hours at 200. Cell density was measured in a Klett colorimeter with a green 54 filter. Euglena gracilis bacillaris Klebs was shaken under white light at 900 as either a nongrowing culture in buffer ( 1 ) or as a growing culture in medium (9) and O. uptake measured manometrically at 300 in water 1, 2, and 3 days after inoculation. Other cultures were grown in darkness at 200 on a rotarv shaker, the cells washed by centrifugation and then incubated in buffer or in mediumii for uT) to 72 hours in light. Chlorophylls alnd carotenioids were determinied (18). Sordaria fi,niicolai Cesati a(ll Notaritis was grown in darkniess at 250 in petri dishes containing Difco cornmeal agar pltus 1 % glucose. Disks of agar alnd myceliumiii vere remove(d with a n1o. 2 corkborer