Abstract
The regulation of expression of the genes encoding the large subunit (LSU) and small subunit (SSU) of ribulose 1,5-bisphosphate carboxylase (RuBPCase) was examined in 1- through 8-day-old, dark-grown (etiolated) and light-grown amaranth cotyledons. RuBPCase specific activity in light-grown cotyledons increased during this 8-day period to a level 15-fold higher than in dark-grown cotyledons. Under both growth conditions, the accumulation of the LSU and SSU polypeptides was not coordinated. Initial detection of the SSU occurred 1 and 2 days after the appearance of the LSU in light- and dark-grown cotyledons, respectively. Furthermore, although the levels of the LSU were similar in both light- and dark-grown seedlings, the amount of the SSU followed clearly the changes in enzyme activity. Synthesis of these two polypeptides was dramatically different in etiolated versus light-grown cotyledons. In light the synthesis of both subunits was first observed on day 2 and continued throughout the growth of the cotyledons. In darkness the rate of synthesis of both subunits was much lower than in light and occurred only as a burst between days 2 and 5 after planting. However, mRNAs for both subunits were present in etiolated cotyledons at similar levels on days 4 through 7 (by Northern analysis) and were functional in vitro, despite their apparent inactivity in vivo after day 5. In addition, since both LSU and SSU mRNA levels were lower in dark- than in light-grown seedlings, our results indicate that both transcriptional and post-transcriptional controls modulate RuBPCase production in developing amaranth cotyledons.
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Selected References
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