Developmental Changes in Amounts of Thylakoid Components in Plastids of Barley Leaves |
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Authors: | Ohashi, Kazuko Murakami, Akio Tanaka, Ayumi Tsuji, Hideo Fujita, Yoshihiko |
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Affiliation: | 1 Laboratory for Plant Ecological Studies, Faculty of Science, Kyoto University Kyoto, 606-01 Japan 2 Department of Cell Biology, National Institute for Basic Biology Okazaki, Aichi, 444 Japan |
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Abstract: | Changes in the amounts of several components of the photosyntheticelectron-transport system during greening of etiolated barleyleaves were studied on a "per plastid" basis. P700 and QA, whichwere initially absent from etioplasts, appeared 2 h after thestart of illumination in complete complexes of PS I and PS II,respectively. From 6 h, they increased rapidly in amount witha constant stoichiometric ratio of 1:1. Amounts of Cyt f, Cytb6, Cyt b-559 and FeS, initially present in etioplasts at levelsthat were one-third to half of those in mature chloroplasts,also increased rapidly after 6 h of illumination. The molarratio of Cyt f, Cyt b6 and Cyt b-559 was the same in etioplastsand in mature chloroplasts, namely 1:2:2. After 4 h of illumination,levels of FeS increased at nearly the same rate as those ofthe PS I complex. The increase in levels of all components wasmarked after 6 h of illumination, probably due to the energysupplied by developing plastids that had just become photosyntheticallycompetent. The results are discussed in relation to the timeof appearance of chlorophyll-protein complexes and photochemicalactivities. 1 Present address: Department of Botany, Faculty of Science,Kyoto University, Kyoto, 606-01 Japan. |
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