Identification of volatile allelochemicals fromAmaranthus palmeri S. Wats |
| |
Authors: | W. J. Connick Jr. J. M. Bradow M. G. Legendre S. L. Vail R. M. Menges |
| |
Affiliation: | (1) Southern Regional Research Center, USDA, ARS, P.O. Box 19687, 70179 New Orleans, Louisiana;(2) Conservation and Production Systems Research, USDA, ARS, P.O. Box 267, 78596 Weslaco, Texas |
| |
Abstract: | Allelopathic volatiles associated with the weed Palmer amaranth (Amaranthus palmeri S. Wats.; AMAPA) were trapped on Tenax GC, thermally desorbed, and identified by gas chromatography-mass spectroscopy. Methyl ketones and alcohols (C4–C11) were the principal components of the volatiles mixture. Seedheads, stems, or roots were placed in a glass container and incubated at 31 °C (10 hr)/21 °C (14 hr) for three days prior to trapping the volatiles. Seedheads were rich in 2-heptanone which was consistently found, together with 2-heptanol, in all AMAPA tissues. Vapors of authentic 2-heptanone and (±)-2-heptanol at concentrations of 1 ppm or higher strongly inhibited the germination of onion and carrot and almost completely suppressed the germination of tomato and AMAPA seeds.Names of companies or commercial products are given solely for the purpose of providing specific information; their mention does not imply recommendation or endorsement by the U.S. Department of Agriculture over others not mentioned. |
| |
Keywords: | Amaranthus palmeri Palmer amaranth allelopathy seed germination weed residue volatiles ketones alcohols 2-heptanone 2-heptanol |
本文献已被 SpringerLink 等数据库收录! |
|