Light Control of Chlorophyll Accumulation in Higher Plants

Kasemir, H.

doi:10.1007/978-3-642-68918-5_25

Cited by 32 publications

(31 citation statements)

References 156 publications

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“…However, until now it has been shown only on relatively early events in the greening time sequence of dark grown tissues. In this study, we have shown that a phytochrome system regulates the formation of ALA, the first committed metabolite in the synthesis of Chl and other tetrapyrroles, in a tissue that has already accumulated 45% of its final Chl content on a fresh weight basis ( 12), and is presumably in the terminal stages of greening (4,14).…”

Section: Discussionmentioning

confidence: 79%

“…This is so not only because the reduction of ring D (the conversion of Pchlide to Chlide) requires light, but light regulation also extends to the synthesis of Pchlide (14,24). In dark-grown tissue, Pchlide synthesis is limited; but upon exposure to light, the Pchlide initially present is transformed to Chlide and then to Chl.…”

mentioning

confidence: 99%

“…In many cases it has been seen that the removal of the lag phase is under control ofthe phytochrome system, and that the phytochrome system somehow modulates the synthesis of ALA2 in the early stages of greening (16,17,22,23). Many other biochemical and cytological changes take place during the lag phase, which are also under the control of phytochrome ( 14,24). 'Supported by National Science Foundation grant DMB 841532 1.…”

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confidence: 99%

“…A great deal of interest has been funneled in recent years into the relationship between the phytochrome regulation of Chl accumulation and the phytochrome regulation of Pchlide reductase (EC 1.3.1.33) and of Chl a/b binding proteins (2,10,20). Exogenous ALA is rapidly converted to Pchlide, even in the dark, suggesting that the regulation of Pchlide synthesis by light takes place at the level of ALA synthesis (14,24). Until recently, it has been generally thought that the phytochrome regulation is limited to the early stages of greening and that feedback inhibition of ALA synthesis by pchlide controls ALA synthesis later on (14).…”

mentioning

confidence: 99%

“…Exogenous ALA is rapidly converted to Pchlide, even in the dark, suggesting that the regulation of Pchlide synthesis by light takes place at the level of ALA synthesis (14,24). Until recently, it has been generally thought that the phytochrome regulation is limited to the early stages of greening and that feedback inhibition of ALA synthesis by pchlide controls ALA synthesis later on (14). In the companion paper (12), we have examined the regulation of ALA synthesis in chloroplasts isolated from partially greened cucumber cotyledons and have found that feedback inhibition of ALA synthesis by Pchlide is not significant.…”

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confidence: 99%

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Regulation of 5-Aminolevulinic Acid (ALA) Synthesis in Developing Chloroplasts

Huang¹,

Bonner²,

Castelfranco³

1989

Plant Physiol.

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When dark-grown cucumber (Cucumis sativus L.) seedlings previously exposed to white light for 20 hours were retumed to darkness, the ability of isolated chloroplasts to synthesize 5-aminolevulinic acid dropped by approximately 70% within 1 hour. The seedlings were then exposed to light, and the synthetic ability of the isolated chloroplasts was determined. Restoration of the synthetic capacity was promoted by continuous white or red light of moderate intensity. Intermittent red light was also effective. Blue and far-red light did not restore the synthetic capability. Blue light given after a red pulse did not enhance the effect of the red light. Far-red light given immediately after each red pulse prevented the stimulation due to intermittent red light. Restoration of the biosynthetic activity by in vivo light treatments was inhibited by cycloheximide indicating the requirement for translation on 80 S ribosomes for the in vivo light response. These findings suggest that the majority of the plastidic 5-aminolevulinic acid synthesis is under phytochrome regulation.

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Section: Discussionmentioning

confidence: 79%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Regulation of 5-Aminolevulinic Acid (ALA) Synthesis in Developing Chloroplasts

Huang¹,

Bonner²,

Castelfranco³

1989

Plant Physiol.

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Characterization of a negatively light-regulated mRNA from Lemna gibba

1988

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We have isolated a cDNA clone, called pLg106, which corresponds to a negatively light-regulated mRNA in the aquatic monocot Lemna gibba. Lg106 mRNA is more abundant in dark-treated plants than in plants grown under continuous white light. The levels of Lg106 mRNA reached a maximum 12-24 hours after plants had been placed in the dark. In vitro-labelled transcripts from nuclei isolated from white light-grown and darktreated Lemna hybridized equally to Lg106 DNA, indicating that transcription of the Lg106 gene was similar in both white light and darkness. Therefore, the higher level of Lg106 mRNA in the dark was not attributable to a change in transcription. We suggest that the stability of Lg106 mRNA is affected by changes in illumination. The steady-state level of Lg106 did not appear to be under phytochrome regulation, as the abundance of Lg106 mRNA from plants grown in intermittent red light or intermittent red followed immediately by far-red light was not significantly different from that of dark-treated plants. The size of the mRNA was estimated to be 650-700 nt. Genomic Southern blots indicated the presence of a single gene for Lg106. The Lg106 cDNA was sequenced and examined for similarities to nucleotide sequences in GenBank.

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Long-term effects of blue or red light on ATP and ADP contents in primary barley leaves

Bukhov

Bondar

Drozdova

1995

Planta

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Abstract. Levels of ATP and ADP were studied in primary leaves of barley (Hordeum vulgare L. cv. Viner) seedlings grown under blue (BL) or red light (RL) of various irradiances. In mature leaf segments, BL stimulated a greater accumulation of adenylates than RL. Transfer of barley seedlings from RL to BL for 48 h caused about a twofold increase in the content of adenylates, probably due to de-novo synthesis of adenine nucleotides. Weak BL was found to stimulate an increase in the adenylate content and a higher irradiance enhanced the stimulatory effect. The adenylate content increased markedly from the base towards the tip of barley leaves grown under BL but not in those grown under RL. However, the adenylate content was higher in the basalmost segment of barley leaves grown under RL, indicating that the action of RL on adenylate content proceeded more rapidly than that of BL. The same conclusion could be drawn from the results of experiments with de-etiolated leaves. A linear relationship was established between the maximum rate of CO 2 fixation and the ATP or ADP content in mature segments of primary barley leaves. The possible involvement of two photoreceptors, phytochrome and cryptochrome, in the long-term light regulation of the total content of adenylates in primary barley leaves is discussed.

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Light Control of Chlorophyll Accumulation in Higher Plants

Cited by 32 publications

References 156 publications

Regulation of 5-Aminolevulinic Acid (ALA) Synthesis in Developing Chloroplasts

Regulation of 5-Aminolevulinic Acid (ALA) Synthesis in Developing Chloroplasts

Characterization of a negatively light-regulated mRNA from Lemna gibba

Long-term effects of blue or red light on ATP and ADP contents in primary barley leaves

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