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The release of secondary dormancy by ethylene in Amaranthus caudatus L. seeds

Published online by Cambridge University Press:  22 February 2007

Jan Kępczyñski ,
Magdalena Bihun  and
Ewa Kępczyñska
Jan Kępczyñski*
Affiliation:
University of Szczecin, Department of Plant Physiology, Waska 13, 71-415 Szczecin, Poland
Magdalena Bihun
Affiliation:
University of Szczecin, Department of Plant Physiology, Waska 13, 71-415 Szczecin, Poland
Ewa Kępczyñska
Affiliation:
University of Szczecin, Department of Plant Physiology, Waska 13, 71-415 Szczecin, Poland
*
*Correspondence Tel./fax: + 48–91–444–15–44 Email jkep@ sus.univ.szczecin.pl
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Abstract

Neither ethylene nor 1-aminocyclopropane-1-carboxylic acid (ACC) was able to prevent the induction of secondary dormancy of Amaranthus caudatus at 45°C. Both ethylene (4.5 × 10-9–4.5 × 10-7 M) and ACC (10-3–10-2 M) removed secondary dormancy at 25°C, although ethylene was much more effective. The presence of ethylene for only 10 h was sufficient to remove secondary dormancy in almost all seeds. Incubation of secondary dormant seeds for up to 5 d at 25°C did not change sensitivity to ethylene. The breaking of secondary dormancy by ethylene was prevented by 2,5-norbornadiene (NBD; 1.5 × 10-5–3 × 10-4 M), indicating the physiological action of ethylene. Abscisic acid (ABA; 10-4–10-3 M) increased the requirement for exogenous ethylene. It is suggested that secondary dormancy in A. caudatus seeds might be related to insufficient ethylene production associated with an insufficient amount of ACC.

Keywords

abscisic acid1-aminocyclopropane-1-carboxylic acidethylene2,5-norbornadienesecondary dormancy;Amaranthus caudatus
Type
Research Article
Information
Seed Science Research , Volume 13 , Issue 1 , March 2003 , pp. 69 - 74
Copyright
Copyright © Cambridge University Press 2003

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