Nonphotosynthetic retardation of chloroplast senescence by light

Excised apical portions of green wheat leaf sections were treated with aminotriazole to prevent formation of new chloroplasts. Illumination retarded the decline in chlorophyll content per leaf section, the disintegration of chloroplast ultrastructure, and the loss of capacity for photosynthetic carb...

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Veröffentlicht in:Plant physiology (Bethesda) 1969-11, Vol.44 (11), p.1619-1628
Hauptverfasser: Haber, A.H, Thompson, P.J, Walne, P.L, Triplett, L.L
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container_end_page 1628
container_issue 11
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container_title Plant physiology (Bethesda)
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creator Haber, A.H
Thompson, P.J
Walne, P.L
Triplett, L.L
description Excised apical portions of green wheat leaf sections were treated with aminotriazole to prevent formation of new chloroplasts. Illumination retarded the decline in chlorophyll content per leaf section, the disintegration of chloroplast ultrastructure, and the loss of capacity for photosynthetic carbon fixation. We interpret these 3 effects of illumination as facets of a single light effect in retarding chloroplast senescence. This light effect in retarding chloroplast senescence has features differing from characteristics of photosynthetic carbon fixation. For example, A) application of the photosynthetic inhibitor 3-(3,4-dichlorophenyl)-1,1-dimethylurea did not decrease, and may have even slightly increased, the effectiveness of light; B) although the action spectrum contains peaks in the blue and red regions, it differs from the action spectrum for photosynthetic CO2 assimilation in wheat; C) in nonphotosynthesizing tissue, application of sugars did not retard chloroplast senescence; D) light saturation was achieved by only a few hundred $\text{microwatts}/\text{cm}^{2}$. Considered together with the well-known light requirement for chloroplast formation, our results indicate that light has a dual, photomorphogenetic control in maintaining the green status of the plant by also exerting a second effect: retarding of senescence of chloroplasts already present.
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source JSTOR Archive Collection A-Z Listing; EZB-FREE-00999 freely available EZB journals; Alma/SFX Local Collection
subjects botany
Chlorophylls
Chloroplasts
Leaves
Light
Luminous intensity
Optical filters
Photosynthesis
Plant Science and Plant Products
Plants
Seedlings
Visible spectrum
title Nonphotosynthetic retardation of chloroplast senescence by light
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