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Oxygen interacts with priming, moisture content and temperature to affect the longevity of lettuce and onion seeds

Published online by Cambridge University Press:  06 May 2011

Andrés R. Schwember  and
Kent J. Bradford
Andrés R. Schwember
Affiliation:
Department of Plant Science, Faculty of Agronomy and Forestry Engineering, Pontificia Catholic University of Chile, Av. Vicuña Mackenna 4860, Macul, Santiago, Chile
Kent J. Bradford*
Affiliation:
Department of Plant Sciences, Seed Biotechnology Center, One Shields Avenue, University of California, Davis, CA95616-8780, USA
*
*Correspondence Fax: +1-530-754-7222 Email: kjbradford@ucdavis.edu
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Abstract

Lettuce (Lactuca sativa L.) and onion (Allium cepa L.) seeds have relatively short longevity during storage and their germination is sensitive to environmental stress. Seed priming (controlled hydration followed by drying) can improve seed germination under stressful conditions, inducing faster and more uniform germination over broader temperature ranges, but it can also reduce seed longevity in storage. Controlled deterioration (CD) tests are often employed to study longevity by ageing seeds rapidly at elevated temperature and moisture content, and primed seeds are particularly sensitive to CD conditions. As reactive oxygen (O2) species are thought to be involved in seed deterioration, we tested whether storage under reduced O2 atmospheres (0 and 2% O2) would extend the longevity of primed and non-primed seeds under low relative humidity (RH) (33% RH+37°C) and CD (75% RH+50°C) storage conditions. The longevity of both non-primed and primed lettuce seeds in low RH storage was extended by anaerobic environments, but the effect of O2 was much less under CD conditions. In onion, only primed seeds exhibited a beneficial effect of low O2 atmospheres under both types of ageing conditions. In both species, storage under anaerobic conditions was beneficial for extending the longevity of primed seeds, but was not able to ameliorate fully the negative effect of priming on storage life.

Keywords

ageingAllium cepacontrolled deteriorationLactuca sativa
Type
Research Article
Information
Seed Science Research , Volume 21 , Issue 3 , September 2011 , pp. 175 - 185
Copyright
Copyright © Cambridge University Press 2011

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