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Seed dormancy in red rice. XIII: Interaction of dry-afterripening and hydration temperature

Published online by Cambridge University Press:  01 September 2008

Alberto Gianinetti  and
Marc Alan Cohn
Alberto Gianinetti
Affiliation:
CRA – Centro di Ricerca per la Genomica e la Postgenomica, via S. Protaso, 302-29017Fiorenzuola d'Arda (PC), Italy
Marc Alan Cohn*
Affiliation:
Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, 302 Life Sciences Building, Baton Rouge, LA70803, USA
*
*Correspondence Fax: +1-225-578-1415 Email: mcohn@lsu.edu
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Abstract

While red rice (Oryza sativa L.) can remain dormant and viable for many years when fully imbibed, the environmental factors that stimulate germination or induce secondary dormancy in the field have not been characterized. In this study, the interactions between the extent of dry-afterripening and germination temperature have been evaluated as possible factors. Red rice dispersal units (florets) were afterripened for 0–10 weeks at 30°C and incubated in water at 1, 5, 15, 20, 25, 30 and 35°C for 2 weeks; then, all the ungerminated florets were transferred to 30°C for two additional weeks. Germination at the end of each of the two sequential treatments was compared to define both the effect of differing temperatures on germination (first treatment), and the effect of these temperatures on subsequent germination at the optimum temperature (30°C, second treatment). In afterripening red rice, the opening of the temperature window for germination begins at 25–35°C. Fully dormant florets acquired the ability to germinate ≥ 90% at 30°C after 4 weeks of dry-afterripening. However, imbibing florets for 2 weeks at 15°C followed by 2 weeks at 30°C, yielded suboptimal germination and induced a degree of secondary dormancy, dependent upon the extent of previous dry-afterripening. Cold stratification (1°C) had a consistent promotive effect on the subsequent germination, particularly when preceded by 1–2 weeks of dry-afterripening at 30°C. To monitor the effects of germination temperature, median afterripening time was utilized as a relative dormancy index, and changes in this index have been interpreted as an overlapping of germination and the temperature-induced changes in the dormancy status. Field weather data suggested that low-temperature stratification may be a germination trigger in the field, even in southern Louisiana, and this merits further investigation in studies of soil-buried seeds.

Keywords

cold stratificationdry-afterripeningOryza sativaseed dormancytemperature
Type
Research Opinion
Information
Seed Science Research , Volume 18 , Issue 3 , September 2008 , pp. 151 - 159
Copyright
Copyright © Cambridge University Press 2008

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