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- W2000456918 abstract "In the present investigation, an attempt has been made to understand the mechanism of light signal transduction in regulation of steady-state transcript levels of the plastid genes psbA, psaA and rbcL in rice (Oryza sativa L. ssp. indica cv. Pusa 169) seedlings. Red light irradiation of 5-day-old etiolated seedlings for 5 min upregulates the transcript levels of the above-mentioned plastid genes, while far-red light exposure subsequent to red light reverses this effect, indicating the involvement of phytochrome(s). Ca2+ and the Ca2+ ionophore, A23187 increase the level of transcripts in the dark-grown seedlings. Ca2+ chelators (EGTA and BAPTA) as well as Ca2+ channel blockers (nifedipine and verapamil) suppress the accumulation of all transcripts in light. This suggests the involvement of Ca2+ in the photoregulation of plastid genes. Okadaic acid, a specific inhibitor of protein phosphatase 1 and 2A (PP1 and PP2A), and sodium fluoride (NaF), a general inhibitor of protein phosphatases, significantly prevent the light-induced increase in transcript levels of the plastid genes. Staurosporine, a protein kinase inhibitor, causes an increase in the transcript levels in darkness and a further enhancement in conjunction with light. The results suggest that light signal transduction downstream to phytochrome(s) involves Ca2+ and phosphorylation for controlling the pattern of plastid gene expression. Phosphorylation inhibits light-activated gene expression in chloroplasts." @default.
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- W2000456918 date "1999-04-01" @default.
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- W2000456918 title "Involvement of phytochrome(s), Ca<sup>2+</sup>and phosphorylation in light-dependent control of transcript levels for plastid genes<i>(psb</i>A,<i>psa</i>A and<i>rbc</i>L) in rice (<i>Oryza sativa</i>)" @default.
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- W2000456918 doi "https://doi.org/10.1034/j.1399-3054.1999.105415.x" @default.
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