Abstract:

Flowering of Lemna perpusilla strain 6746 grown on 0.1 strength Hutner's medium in short days was inhibited by sucrose, glucose, fructose, and mannose, but not by various other sugars or metabolic intermediates. Only those sugars that inhibited flowering supported heterotrophic growth. Experiments with a single inductive long night indicated that an early stage in flowering was the sugar-sensitive process. Inhibition of flowering by carbohydrates was accompanied by reduced levels of chlorophyll and beta-carotene. The inhibitory effects of carbohydrates on flowering were partially reversed by iminodiacetate, glycine, and l-aspartate but not by d-aspartate, ethylenediaminetetraacetate, acetate, delta-aminolevulinic acid, or mevalonic acid. The possibility is discussed that carbohydrate repression of flowering and of chloroplast pigments resulted from inadequate levels of amino acids.

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Inhibitory Effect of Carbohydrate on Flowering in <em>Lemna perpusilla</em>

H Posner

Abstract

Flowering of Lemna perpusilla strain 6746 grown on 0.1 strength Hutner's medium in short days was inhibited by sucrose, glucose, fructose, and mannose, but not by various other sugars or metabolic intermediates. Only those sugars that inhibited flowering supported heterotrophic growth. Experiments with a single inductive long night indicated that an early stage in flowering was the sugar-sensitive process. Inhibition of flowering by carbohydrates was accompanied by reduced levels of chlorophyll and β-carotene. The inhibitory effects of carbohydrates on flowering were partially reversed by iminodiacetate, glycine, and l-aspartate but not by d-aspartate, ethylenediaminetetraacetate, acetate, δ-aminolevulinic acid, or mevalonic acid. The possibility is discussed that carbohydrate repression of flowering and of chloroplast pigments resulted from inadequate levels of amino acids.

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Arnon DI. COPPER ENZYMES IN ISOLATED CHLOROPLASTS. POLYPHENOLOXIDASE IN BETA VULGARIS. Plant Physiol. 1949 Jan;24(1):1–15.[PMC free article] [PubMed] [Google Scholar]
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^{Department of Biology, State University of New York, Binghamton, New York 13901}

^{This work was supported by National Science Foundation Grants GB-6559 and GB-12955.}

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Abstract

Flowering of Lemna perpusilla strain 6746 grown on 0.1 strength Hutner's medium in short days was inhibited by sucrose, glucose, fructose, and mannose, but not by various other sugars or metabolic intermediates. Only those sugars that inhibited flowering supported heterotrophic growth. Experiments with a single inductive long night indicated that an early stage in flowering was the sugar-sensitive process. Inhibition of flowering by carbohydrates was accompanied by reduced levels of chlorophyll and β-carotene. The inhibitory effects of carbohydrates on flowering were partially reversed by iminodiacetate, glycine, and l-aspartate but not by d-aspartate, ethylenediaminetetraacetate, acetate, δ-aminolevulinic acid, or mevalonic acid. The possibility is discussed that carbohydrate repression of flowering and of chloroplast pigments resulted from inadequate levels of amino acids.

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