Studies of Chloroplast Development in Euglena. XI. Radioautographic Localization of Chloroplast DNA

Considerable evidence exists which is consistent with the picture that the chloroplast system of E1ug- lcna is unider autonomous genietic control. This in- cludes studies of ultraviolet inactivationi anid photo- reactivation of chloroplast inheritanice (7, 10. 13, 14) and the demonlstration of a unique species of chloro- plast-associated DNA (3, 4, s5, 9, 11). Evidence has been presented for distinct chloroplast-associated RNA, in additioni to the usual niuclear DNA anid cvto- llasmnic RNA (2, 6). In this communicationi we l)rovide ad(litionial evi- dence for the localization of DNA in the chloro- plasts