Blue Light and the Photocontrol of Chloroplast Development in Euglena

Schiff, Jerome A.

doi:10.1007/978-3-642-67648-2_46

Cited by 14 publications

(5 citation statements)

References 21 publications

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“…A blueKJV photoreceptor (Senger and Briggs, 1981;Senger, 1982) is probably not involved (Sawney et a /., 1980). However, a regulation by blue light was found with tissue cultures (Kamiya et al, 1981) and isolated greening roots (Bjorn, 1980;GroB and Richter, 1983) while in lower plants blue/UV light i s certainly the prevailing regulatory factor (Brinkmann and Senger, 1980;Hase, 1980: Schiff. 1980Jeffrey, 1981).…”

Section: The Regulatory Photoreceptorsmentioning

confidence: 99%

Action of Light on Chlorophyll(ide) Appearance

Kasemir

1983

Photochem & Photobiology

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Section: The Regulatory Photoreceptorsmentioning

confidence: 99%

Action of Light on Chlorophyll(ide) Appearance

Kasemir

1983

Photochem & Photobiology

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“…Two red-blue photoreactive systems might control pigment accumulation as well as assembly of thylakoid membrane materials: namely the physiologically active phytochrome (Pfr) and the system which converts protochlorophyll (P Chl) into chlorophyll. The involvement of another photoreactive system, such as a blue/UV photoreceptor, has been shown to control chloroplast development in algae [12,23,40]. Whether or not BL exerts a specific effect on Chl synthesis in higher plants has not been proven unequivocally [1,9,33,39].…”

Section: Introductionmentioning

confidence: 99%

Ribulose bisphosphate carboxylase capacity and chlorophyll content in developing seedlings of Chenopodium rubrum L. growing under light of different qualities and fluence rates

et al. 1985

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In order to evaluate the aclimation of Chenopodium seedlings to different quantum fluence rates of R and BL, kinetics of Rubisco capacity, Chl content and chloroplast structure were studied. Under monochromatic light photoreceptors are stimulated selectively and their influence on biosynthetis capacities during chloroplast development can be studied.R irradiations saturate Rubisco capacity even at the lowest quantum fluence rates applied, whereas Chl a+b synthesis depends strongly upon fluence rate of R. Under BL irradiations, both Rubisco capacity and Chl content are fluence rate dependent. R irradiations favour Chl b synthesis relative to Chl a, whereas under BL Chl a content is high relative to Chl b. Under R irradiation Pfr is the main photoreceptor involved in regulation of Rubisco capacity whereas under BL a specific BL absorbing photoreceptor may control the response. From the fluence rate dependency under BL irradiations it is concluded that the blue region of the day light spectrum may be the sensor for monitoring fluence rate and causing the characteristic changes in shade and high/low WL adaptation with respect to Rubisco levels in Chenopodium.

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“…The predominant light-induced effects are the accumulation of pigments and the ultrastructural differentiation of the chloroplast which is directly followed by the appearance of the photosynthetic activity (Boardman et al, 1970;Buschmann, 1981). The light response mainly depends on the intensity (Boardman et al, 1975;Grahl and Wild, 1975;Wild et al, 1975;Lichtenthaler et al, 1981) and quality (Smith, 1975;Schiff, 1980;Senger, 1980) ameters is not yet fully understood. One possible mode of action is that by the phytohormones (Kandeler, 1974;Lichtenthaler and Buschmann, 1978).…”

Section: Introduoionmentioning

confidence: 99%

THE EFFECT OF CYTOKININS ON GROWTH and PIGMENT ACCUMULATION OF RADISH SEEDLINGS (RAPHANUS SATIVUS L.) GROWN IN THE DARK and AT DIFFERENT LIGHT QUANTA FLUENCE RATES*

Buschmann

Lichtenthaler

1982

Photochem & Photobiology

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Abstract— The dependency of cytokinin effects upon irradiance was studied with radish seedlings (Raphanus sativus L. cv. Saxa Treib). Kinetin (6‐furfurylamino‐purine) or BAP (6‐benzylamino‐purine) were applied via the roots of plants growing either in continuous darkness or under high (90 Wm‐2) or low intensity white light (10Wm‐2). Apart from the different development of plants at low and high fluence rates, the following cytokinin effects were found: (1) Both cytokinins acted in a similar manner on growth characteristics and pigment accumulation at high and low light conditions, BAP being in many cases more effective than kinetin. (2) When compared with the control, the cytokinins suppressed hypocotyl and root lengthening in the dark and light‐grown plants. In darkness they led to increased cotyledon areas, whereas in the light the leaf expansion was suppressed. (3) In the etiolated and low light grown plants, the anthocyanin content of the hypocotyls was enhanced due to the action of cytokinins, whereas under high light the anthocyanin accumulation was decreased. (4) In the cotyledons of etiolated plants, more phototransformable protochlorophyll(ide) and more carotenoids were formed when cytokinins were present. In green leaves the carotenoid content was diminished due to the action of cytokinins, particularly in plants grown in strong light. The chlorophyll a/b ratio was increased in the cytokinin‐treated plants in most cases. The results suggest a light dependency of the cytokinin effects. It is believed that the response of a plant towards exogenously applied cytokinins is similar to that with high intensity light.

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Blue Light and the Photocontrol of Chloroplast Development in Euglena

Cited by 14 publications

References 21 publications

Action of Light on Chlorophyll(ide) Appearance

Action of Light on Chlorophyll(ide) Appearance

Ribulose bisphosphate carboxylase capacity and chlorophyll content in developing seedlings of Chenopodium rubrum L. growing under light of different qualities and fluence rates

THE EFFECT OF CYTOKININS ON GROWTH and PIGMENT ACCUMULATION OF RADISH SEEDLINGS (RAPHANUS SATIVUS L.) GROWN IN THE DARK and AT DIFFERENT LIGHT QUANTA FLUENCE RATES*

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