Effects of Light and Darkness on Biosynthesis of Carotenoid Pigments in Wheat Seedlings

Wolf, Frederick A.

doi:10.1104/pp.38.6.649

Cited by 31 publications

(15 citation statements)

References 11 publications

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“…Although less xanthophyll was present, the spectra showed no qualitative differences in the xanthophylls with any of the treatments. Absorption maxima corresponded closely to those for lutein, the primary xanthophyll of darkgrown wheat seedlings (27).…”

Section: Resultsmentioning

confidence: 99%

Inhibition of Carotenoid Synthesis as a Mechanism of Action of Amitrole, Dichlormate, and Pyriclor

1971

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Section: Resultsmentioning

confidence: 99%

Inhibition of Carotenoid Synthesis as a Mechanism of Action of Amitrole, Dichlormate, and Pyriclor

1971

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“…Kinetin has been reported to inhibit the synthesis of lycopene in tomato (19). /3-Carotene is a major carotenoid of wheat leaves (34). Conceivably, cytokinins induced differential responses in the synthesis of different carotenoids.…”

Section: Discussionmentioning

confidence: 99%

Partial Restoration of the High Rate of Plastid Pigment Development and the Ultrastructure of Plastids in Detached Water-stressed Wheat Leaves

Duysen¹,

Freeman²

1975

Plant Physiol.

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Detached etiolated wheat (Triticumn aestivum L. cv. Chris) leaves accumulated plastid pigments at a high rate, developed chloroplasts with stacked thylakoids, and stored plastid starch when wetted on filter paper in light. A moderate water deficit of -10 bars markedly reduced the accumulation of chlorophyll and carotenoids in the 8-day-old detached leaves during greening. 6-Aminolevulinic acid treatment of stressed leaf segments resulted in slightly increased pigment accumulations but benzyladenine application restored plastid pigment formation in stressed tissue to within 15% of the pigment content of the nonstressed detached leaves. The addition of 6-aminolevulinic acid to benzyladenine-treated stressed leaf segments improved both chlorophyll and carotenoid formation to nearly the amounts found in nonstressed leaf tissue. Stressed leaf sections developed plastids that were small, lacked starch, contained few thylakoids per granum, and possessed dilated thylakoids.Benzyladenine application to the stressed leaf segments did not restore normal plastid stacking but benzyladenine induced the formation of extended intergranal lamellae and stimulated pigment accumulations in both stressed and nonstressed detached leaves. Starch was absent in plastids of benzyladeninetreated leaf sections.Mild water deficits have been shown to impair the formation of plastid pigments (6, 9, 33) and modify chloroplast development (7, 13) in intact leaves of seedlings during greening. An imposed stress of -10 bars reduced Chl and carotenoid accumulations early in the development of chloroplasts (9). Plastids of wheat leaves subjected to a moderate stress were small and contained fewer grana per plastid, fewer thylakoids per granum, and more dilated thylakoids (13) than when there was little or no stress.

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“…The rate of pigment formation during plastid development is dependent upon enviromental conditions. The conversion of protochlorophyll(ide) to chlorophyll(ide) a is light dependent (Virgin 1955) as is the stimulated synthesis of protochlorophyll(ide) (Virgin 1958) and the synthesis of leaf carotenoids (Wolf 1963, Goodwin 1967. When etiolated seedlings are exposed to continuous light, there is generally a lag of several hours before the rapid accumulation of chlorophyll (Virgin 1961).…”

Section: Introductionmentioning

confidence: 99%

Effects of Moderate Water Deficit (Stress) on Wheat Seedling Growth and Plastid Pigment Development

Duysen

Freeman

1974

Physiologia Plantarum

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Etiolated 6‐day‐old wheat (Triticum aestivum L. cv. Chris) seedlings were subjected to osmotic stress by an application of polyethylene glycol 12 h prior to the exposure to a continuous 72‐h light period. The water potential of the primary leaf of stressed seedlings was between –9 and –14 bars throughout the light period. Stress impaired seedling growth, leaf unfolding, and the increase in leaf area. The imposed osmotic stress reduced total chlorophyll accumulation, particularly after 9 h light, suggesting that this is the approximate time period for the depletion of the protochlorophyll(ide) pool and the pool of an essential protochlorophyll(ide) precursor. The chlorophyll a/b ratio of extracts from stressed and non‐stressed plants was the same during the 72‐h greening period. Water deficit stress impaired carotenoid accumulation sooner than the impairment of chlorophyll production suggesting either a smaller carotenoid pool size of precursors or that the metabolic pathway of carotenoid synthesis was more sensitive to stress. Shifts from the usual plastid pigment absorbance maxima were not observed in these studies.

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Effects of Light and Darkness on Biosynthesis of Carotenoid Pigments in Wheat Seedlings

Cited by 31 publications

References 11 publications

Inhibition of Carotenoid Synthesis as a Mechanism of Action of Amitrole, Dichlormate, and Pyriclor

Inhibition of Carotenoid Synthesis as a Mechanism of Action of Amitrole, Dichlormate, and Pyriclor

Partial Restoration of the High Rate of Plastid Pigment Development and the Ultrastructure of Plastids in Detached Water-stressed Wheat Leaves

Effects of Moderate Water Deficit (Stress) on Wheat Seedling Growth and Plastid Pigment Development

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