Changes in Fine Structure of Prolamellar Body in Relation to the Formation of the Chloroplast

Abstract

Changes in Fine Structure of Prolamellar Body in Relation to the Formation of the Chloroplast* by Taiji IKEDA* *

Prolamellar Body Formation under Different Light and Temperature Conditions

“…In the previous report, the present author has shown that weak-light prolamellar bodies are of a shape gradually modified from the etiolated prolamellar body during the development of plastids (Ikeda, 1970). As shown in this paper, since the weak-light prolamellar bodies respond very rapidly to the change in environmental factors, it seems that they provide a useful tool for a study on the nature of prolamellar bodies (Table 1).…”

“…Recently, the present writer (Ikeda, 1970) has reported that the prolamellar body can be formed at any developmental stage of the plastids when they are transferred to the dark, and that the prolamellar body increases in number nearly in parallel with the greening process. Nevertheless, the structural difference may be observed between the "weak-light prolamellar bodies" and the "etiolated prolamellar bodies" so-called by Wrischer (1966) ; the former has the shape gradually transitioned from the latter during the development of the plastid.…”

Etioplast and etio-chloroplast formation under natural conditions: the dark side of chlorophyll biosynthesis in angiosperms

“…Alternatively, Mg-PPIX and Mg-PPIX-MMe may simply be used for Chl biosynthesis. However, interestingly, the increase of these precursors (Mg-PPIX and Mg-PPIX-MMe) at the first 30-60 min of light period coincides with the disappearance of the reformed PLBs (Ikeda 1970).…”

“…The apparent controversy in the literature data can be solved by considering the age of the material studied. The presence of PLBs under LDCs has always been reported in cotyledons or primary leaves of young seedlings, whereas these structures have never been observed in mature leaves with fully differentiated chloroplasts (Ikeda 1970(Ikeda , 1971. At the beginning of the photoperiod, the PLBs disappear and the photoactive Pchlide forms are photoreduced and the enzymatic cycle of LPOR that proceeds in them is the same as the one in the leaves of illuminated dark-grown seedlings (Schoefs and Franck 2008).…”

“…In these seedlings small PLBs are reformed during the dark phase of the LDCs (Garab et al 1980;Ikeda 1970;Rebeiz and Rebeiz 1986;Schoefs and Franck 2008). Later, the synthesis of Chl molecules is much less pronounced and no PLB is observed.…”