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Seed dormancy in red rice (Oryza sativa). XI. Commercial liquid smoke elicits germination

Published online by Cambridge University Press:  22 February 2007

Lucia C. Doherty  and
Marc Alan Cohn
Lucia C. Doherty
Affiliation:
Department of Plant Pathology and Crop Physiology, 302 Life Sciences Building, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
Marc Alan Cohn*
Affiliation:
Department of Plant Pathology and Crop Physiology, 302 Life Sciences Building, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA
*
*Correspondence Fax: 225 578 1415 Email: [email protected]
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Abstract

A commercial liquid smoke (LS) flavoring product (Reese Hickory brand) in aqueous dilutions of 4–5% (v/v) broke dormancy (40–100% germination) of both intact and dehulled red rice (Oryza sativa). To elicit this response in intact grains, the glumes had to be pricked with a dissecting needle following contact with LS and water rinsing. Germination percentages rose with increasing contact time (up to 7 d), and grains first imbibed with water before transfer to LS showed similar germination percentages as those first incubated with LS before transfer to water. LS dilutions were highly acidic (about pH 3). Dormancy-breaking activity of LS was pH-dependent and was reduced at pH values of 5–7. Buffer controls remained dormant irrespective of pH value. Maximum activity varied primarily among different bottles of LS and only to a minor extent between red rice seed lots. Dry-afterripening at 30°C for up to 14 d increased the sensitivity of unpricked, intact grains to LS compared with water controls. LS concentrations that broke dormancy of intact grains partially inhibited germination of nondormant, fully afterripened grains. Storing grains in containers of flooded soil increased sensitivity to both LS and pricking. Nitrite levels in LS were negligible and insufficient to account for the bioactivity of LS.

Keywords

Oryza sativaliquid smokeseed dormancyred ricenitrite
Type
Research Article
Information
Seed Science Research , Volume 10 , Issue 4 , December 2000 , pp. 415 - 421
Copyright
Copyright © Cambridge University Press 2000

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