What question did this study set out to answer?

Determine the physiological effects of scopoletin exposure on growth, carbon dioxide exchange, and internal phenolic concentrations across tobacco, sunflower, and pigweed seedlings.

January 1, 1970Bulletin of the Torrey Botanical ClubOpen Access

Effects of Scopoletin on Growth, CO 2 Exchange Rates, and Concentration of Scopoletin, Scopolin, and Chlorogenic Acids in Tobacco, Sunflower, and Pigweed

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Authors

FEFrank A. EinhelligMissouri State University ERElroy L. RiceNew York Botanical Garden PRPaul G. RisserOak Ridge National Laboratory

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Implication

Controlled laboratory study shows dose-dependent growth and photosynthetic inhibition in tobacco, sunflower, and pigweed seedlings, indicating an ecological role in natural plant suppression.

Key Points

Determine the physiological effects of scopoletin exposure on growth, carbon dioxide exchange, and internal phenolic concentrations across tobacco, sunflower, and pigweed seedlings.
Cultured tobacco, sunflower, and pigweed seedlings in nutrient media treated with scopoletin concentrations of 10⁻⁴ M, 5 × 10⁻⁴ M, and 10⁻³ M.
Measured tissue concentrations of scopoletin, scopolin, and chlorogenic acid isomers alongside respiration and net CO₂ exchange rates over a 12-day period.
Identified a growth inhibition threshold between 10⁻⁴ M and 10⁻³ M scopoletin, where 10⁻³ M treatment markedly depressed net photosynthesis to 34% of controls in tobacco and 74% of controls in sunflower by day four.
Observed substantial tissue accumulation of scopoletin and scopolin—particularly in shoots relative to roots—indicating rapid metabolic glycosylation of scopoletin into scopolin.
Maintained constant respiration rates and unaffected chlorogenic acid concentrations across treatments, confirming that reduced net photosynthesis drove the decrease in leaf area and plant growth.

Cite This Study

Einhellig et al. (1970) studied this question.

synapsesocial.com/papers/6a97201f555aebb9fcbb94f2 https://doi.org/10.2307/2483987

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Implication

Controlled laboratory study shows dose-dependent growth and photosynthetic inhibition in tobacco, sunflower, and pigweed seedlings, indicating an ecological role in natural plant suppression.

Effects of Scopoletin on Growth, CO 2 Exchange Rates, and Concentration of Scopoletin, Scopolin, and Chlorogenic Acids in Tobacco, Sunflower, and Pigweed

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Key Points

Cite This Study

Effects of Scopoletin on Growth, CO 2 Exchange Rates, and Concentration of Scopoletin, Scopolin, and Chlorogenic Acids in Tobacco, Sunflower, and Pigweed

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Implication

Key Points

Cite This Study

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