Skip to Main Content
Due to a lapse in federal funding, this USDA website will not be actively updated. Once funding has been reestablished, online operations will continue.
The wounding response of dormant barnyardgrass (Echinochloa crus-galli) seedsAuthor(s): G.R. Leather; Shi-Jean S. Sung; M.G. Hale
Source: Weed Science 40:200-203.
Publication Series: Miscellaneous Publication
PDF: View PDF (253 KB)
DescriptionInduction of germination in dormant barnyard grass seeds by wounding was investigated. Previous research indicated that a volatile compound was emitted during imbibition of wounded caryopses.When wounded caryopses were submerged in agar, total germination and speed of germination were stimulated, and the stimulation was dependent upon the concentration of agar.A twofold increase in germination occurred in 1% agar versus water, and a fivefold increase with caryopses placed in 5% agar.When wounded caryopses were imbibed, there was a fourfold increase in respiration over half that of intact caryopses after 1 h.This increased rate of respiration of wounded caryopses continued for 7 h, while there was a gradual increase in respiration of intact caryopses.Carbon dioxide induced intact dormant caryopses to germinate but was not effective in stimulating germination of the seed (spikelet). High levels of abscisic acid found in the hulls of dormant seeds may have prevented the action of carbon dioxide.These results suggest that increased respiration resulting from wounding provides elevated levels of carbon dioxide in the microenvironment of the seed, thus stimulating germination.Removal of the hulls is necessary for germination even in high levels of carbon dioxide.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLeather, G.R.; Sung, Shi-Jean S.; Hale, M.G. 1992. The wounding response of dormant barnyardgrass (Echinochloa crus-galli) seeds. Weed Science 40:200-203.
- Environmental factors influencing Pyrenophora semeniperda-caused seed mortality in Bromus tectorum
- Niche specialization in Bromus tectorum seed bank pathogens
- A proposed mechanism for high pathogen-caused mortality in the seed bank of an invasive annual grass
XML: View XML