Abstract
In plants, some of photosynthetic genes are encoded in the cell nucleus and others are in the plastid genome. In this study we used unicellular red alga Cyanidioschyzon merolae 10D which divides synchronously during the photoperiod and examined the accumulation pattern of transcripts of photo-genes by northern hybridization analysis. The accumulation patterns of the transcripts of photo-genes are categorized into several groups. For example, the amount of transcripts of plastid-coded psaA gradually decreased in the dark and abruptly increased in the light while those of psbA were constant andpsbEFLJ constantly increased through both dark and light conditions. The transcripts of nuclear-encoded psbO decreased abruptly decreased after dark and slightly increased. The variation patterns of the accumulation of transcripts and genes are discussed.
