Differential Inhibition of Seed Germination by Sweetpotato (Ipomoea batatas) Root Periderm Extracts

The effect of sequential hexane, ethyl acetate, and aqueous methanol extracts of ‘Regal’ sweetpotato periderm on seed germination of sweetpotato, proso millet, and seven weed species was studied. The hexane extract, which contained the nonpolar components of the periderm tissue, was least inhibitory...

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Bibliographic Details
Published in:Weed science 1991-03, Vol.39 (1), p.119-123
Main Authors: Peterson, Joseph K., Harrison, Howard F.
Format: Article
Language:English
Subjects:
ABUTILON THEOPHRASTI
Acetates
Allelopathy
ALLOMONE
ALOMONAS
AMARANTHUS
BATATA
CASSIA OCCIDENTALIS
COMPETENCIA BIOLOGICA
COMPETITION BIOLOGIQUE
COMPOSITAE
DOSAGE BIOLOGIQUE
ELEUSINE INDICA
ENSAYO BIOLOGICO
EXTRACTOS VEGETALES
EXTRAIT D'ORIGINE VEGETALE
GERMINACION
GERMINATION
Hexanes
INHIBIDORES DE LA GERMINACION
INHIBITEUR DE GERMINATION
IPOMOEA BATATAS
Millet
PANICUM MILIACEUM
PATATE DOUCE
Periderm
PERIDERME
PERIDERMIS
PHARBITIS
Plant growth
Plants
Seed germination
SOLANUM NIGRUM
Special Topics
Sweet potatoes
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Summary:The effect of sequential hexane, ethyl acetate, and aqueous methanol extracts of ‘Regal’ sweetpotato periderm on seed germination of sweetpotato, proso millet, and seven weed species was studied. The hexane extract, which contained the nonpolar components of the periderm tissue, was least inhibitory. It inhibited velvetleaf, proso millet, black nightshade, and redroot pigweed germination, and maximum inhibition was 56% for black nightshade at 200 mg of periderm extracted ml–1. The ethyl acetate fraction was inhibitory to proso millet, velvetleaf, black nightshade, goosegrass, tall morningglory, coffee senna, and redroot pigweed. The estimated I50 for ethyl acetate ranged from 17 mg periderm extracted ml–1 for black nightshade to 201 mg ml–1 for coffee senna. Sweetpotato, tall morningglory, and eclipta germination was not inhibited by this extract at the concentrations tested. The aqueous methanol extract was much more inhibitory than the hexane or ethyl acetate extracts, and there was considerable variation between species in response to this extract The I50 estimates for the aqueous methanol extract were 0.5, 0.6, 2.8, 4.4, 5.1, 9.6, 15.7, 21.0, and 25.8 mg ml–1 for velvetleaf, proso millet, black nightshade, goosegrass, sweetpotato, tall morningglory, eclipta, coffee senna, and pigweed, respectively.
ISSN:0043-1745
1550-2759
DOI:10.1017/S0043174500057970