SORE “TONITE enn unite ere PTION OF TUMORS ON IPOMOEA TUBA FROM THE A-BOMB TEST SITES ON ENIWETOK ATOLL FE OE Appendix to Radicbiological Survey of Bikini, Eniwetok, and Likiep Atolls-~July-August 1949 SE PRO RRR MITETTgeeTYneegappt NOAteNaar SRTANE? RRAACE gr i By Susann F. Biddulph and Orlin Biddulph r Tumors on plants of Ipomoea tuba were found on Engebi Island during the At this time (17 months from fay gue? pobiological survey of July and August, 1949. TNRCHA TURE i 2 ae est shot on Engebi Island) many of the Ipomoea tuba plants located in an 400 to 600 yards from the bomb crater showed tumorous growths of various “The tumorous plants were found in disjunct areas of grass which had een fully covered by the dense growth of Ipomoea which surrounded them Fa a RE oly, esstMe re 1). This species of Ipomoea is a vine with large heart-shaped leaves and a which grows prostrate on the ground to a length of some ten meters (Figure 2). The tumorous deformations on the plant varied from small warty out-growths chonodes on the basal portions of the stem (Figure 3) to huge, convoluted The ability of the plants to recover from the deforma~ L was indicated by the fact that the tumors were confined to the basal nodes the first case mentioned above, and that even in the most severe cases leaves were occasionally produced from tumorous masses (Figure 4). Morphological and physiological abnormalities were found in other plants These were noted in the original port by both Biddulph and St. John (30) and included twisted stems and wR « » reduced leaves, abnormal fruits, double flowers, color changes, etoe ar as observed, Ipomoea tuba was the only plant to show tumorous growths. Time and facilities did not permit a study of the tumors during the sure AECD-3446 (App. ) 3 wre ooh we PR me ios ~~ TOsEST TO OERABI, “ORS AnserR on some of the other islands surveyede ve PM oes dimeters in height. OPE Rte kerry rous masses completely covering a stem which had been reduced to only a few