Differential effects of actinomycin D on cell division and light-induced chloroplast development in Euglena

PHOTOCONTROL OF ORGANELLE BIOGENESIS IN Euglena

“…Although the presence of a photoreceptor(s) absorbing blue but not red light is clearly established, chloroplast development proceeds normally under red light (Bovarnick et al, 1969;Vaisberg et al, 1976;Bingham and Schiff, 1979b). This should not be interpreted as indicating that responses controlled by blue absorbing photoreceptors are not required for chloroplast biogenesis but rather that a specific photoresponse is usually controlled by more than one photoreceptor.…”

Events Surrounding the Early Development of Euglena Chloroplasts

“…controlled by a blue photoreceptor while the plastid is controlled by a Pchl(ide) type of receptor which absorbs in both the red and blue, it is well known that plastid development can be induced to take place in red light alone (5,22). We postulated that upon induction a signal can be sent from the plastid to the cytoplasm to turn on synthetic reactions there in the absence of blue light.…”