Spectral Sensitivities for Leaf and Stem Growth of Etiolated Pea Seedlings and Their Similarity to Action Spectra for Photoperiodism

Parker, M. W.; Hendricks, S. B.; Borthwick, H. A.; Went, F. W.

doi:10.1002/j.1537-2197.1949.tb05248.x

Cited by 97 publications

(49 citation statements)

References 8 publications

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“…The results of a number of simple experiments with gelatin filters of known transmission at a given intensity indicate that the most effective wave lengths for inhibition of lateral root formation are within the red range of the spectrum (6100 to 7500 A) and the least effective are in the blue-green region (4200 to 5400 A). Although no definite statement concerning the effective wave lengths can be made until a precise determination of an action spectrum has been made, the evidence presented is of interest in view of the numerous recent reports of the spectral sensitivities for photoperiodic control of floral initiation in short and long-day plants (9,10), for leaf and stem growth of etiolated pea seedlings (11) and for certain phases of inhibition of growth of the Avena internode (6). It is of interest that not only the etiolated and green stem tissues, but the root tissues as well, show morphological responses to illumination of apparently similar spectral distribution.…”

Section: Discussionmentioning

confidence: 99%

Effects of Light on Elongation and Branching in Pea Roots

Torrey

1952

Plant Physiol.

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Section: Discussionmentioning

confidence: 99%

Effects of Light on Elongation and Branching in Pea Roots

Torrey

1952

Plant Physiol.

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“…High levels of green ra(liation inhibit stem elongation and this inhibition may be reversed by gibberellic acid treatment ( (11) (9,12). It was found in the earlier studies that red radiation was most effective in causing growth inhibition.…”

Section: Seedlsmentioning

confidence: 99%

Growth Responses of Alaska Pea Seedlings to Visible Radiation and Gibberellic Acid.

Lockhart

Gottschall

1959

Plant Physiol.

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“…Phytochrome controls a number of developmental processes from the synthesis of specific proteins (14) to the gross morphological characteristics such as leaf expansion (15). The development of photosynthetically active plastids, however, requires the phototransformation of protochlorophyll and the accumulation of chlorophyll.…”

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confidence: 99%

Greening of Etiolated Bean Leaves in Far Red Light

1971

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Eight-day-old dark-grown bean leaves were greened by prolonged irradiation with far red light. Growth, chlorophyll content, oxygen-evolving capacity, photophosphorylation capacity, chloroplast structure (by electron microscopy), and in vivo forms of chlorophyll (by low temperature absorption and derivative spectroscopy on intact leaves) were followed during the greening process. Chlorophyll a accumulated slowly but continuously during the 7 days of the experiment (each day consisted of 12 hours of far red light and 12 hours of darkness). Chlorophyll b was not detected until the 5th day. The capacity for oxygen evolution and photophosphorylation began at about the 2nd day. Electron microscopy showed little formation of grana during the 7 days but rather unfused stacks of primary thylakoids. The thylakoids would fuse to give grana if the leaves were placed subsequently in white light.The low temperature spectroscopy of intact leaves showed that the chlorophyll a was differentiated into three forms with absorption maxima near 670, 677, and 683 nanometers at -196 C during the first few hours and that these forms accumulated throughout the greening process. Small amounts of two longer wavelength forms with maxima near 690 and 698 nanometers appeared at about the same time as photosynthetic activity.The development of etiolated tissue of higher plants in the light involves phototransformations of both phytochrome and protochlorophyll. Phytochrome controls a number of developmental processes from the synthesis of specific proteins (14) to the gross morphological characteristics such as leaf expansion (15). The development of photosynthetically active plastids, however, requires the phototransformation of protochlorophyll and the accumulation of chlorophyll. Even though both pigment systems play decisive roles in directing the development of the plant, there appears to be little interaction between the two systems with the exception that the rate of protochlorophyll synthesis after the initial transformation is influenced by phytochrome (16). Long before the discovery of phytochrome as the photomorphogenic pigment (5) of California, San Diego, La Jolla, California 92037 sources of different spectral quality and red and blue sources of low intensity, that protochlorophyll and chlorophyll did not participate in the photomorphogenic growth responses.Phytochrome in dark-grown seedlings is entirely in the Pr' form (3). It was shown, however, that a low level of Pfr is established as a photostationary state by far red light (because of the long wavelength absorption tail of Pr), and it was suggested that the photomorphogenic responses obtained with prolonged far red irradiation were due to the maintenance of the low level of Pfr over a long period of time (in darkness Pfr reverts to Pr) (3). Mohr and his co-workers (13) have shown in a number of cases that prolonged irradiation with far red light activates the phytochrome system. Hicker (9) illuminated etiolated mustard seedlings with continuous far red light (740 nm ...

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Spectral Sensitivities for Leaf and Stem Growth of Etiolated Pea Seedlings and Their Similarity to Action Spectra for Photoperiodism

Cited by 97 publications

References 8 publications

Effects of Light on Elongation and Branching in Pea Roots

Effects of Light on Elongation and Branching in Pea Roots

Growth Responses of Alaska Pea Seedlings to Visible Radiation and Gibberellic Acid.

Greening of Etiolated Bean Leaves in Far Red Light

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