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Dormancy breakage of Stylosanthes humilis seeds by aluminium

Published online by Cambridge University Press:  07 June 2010

Dimas M. Ribeiro ,
Ana M. Mapeli ,
Marcelo A.G. Carnelossi ,
Carla A. Delatorre  and
Raimundo S. Barros
Dimas M. Ribeiro
Affiliation:
Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-000Viçosa, MG, Brasil
Ana M. Mapeli
Affiliation:
Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-000Viçosa, MG, Brasil
Marcelo A.G. Carnelossi
Affiliation:
Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-000Viçosa, MG, Brasil
Carla A. Delatorre
Affiliation:
Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-000Viçosa, MG, Brasil
Raimundo S. Barros*
Affiliation:
Departamento de Biologia Vegetal, Universidade Federal de Viçosa, 36570-000Viçosa, MG, Brasil
*
*Correspondence Fax: +55 31 3899 2580 Email: rsbarros@ufv.br
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Abstract

Physiological dormancy of scarified seeds of Townsville stylo (Stylosanthes humilis HBK) was released by acidic aluminium (Al3+) solution. Antiethylenic substances inhibited germination of low-pH-stimulated dormant seeds, with a correspondingly low ethylene production and low activity of 1-aminocyclopropane-1-carboxylate (ACC) oxidase in seeds. On the other hand, antiethylenic substances did not decrease the germination of Al3+-stimulated seeds, but ACC oxidase activity and ethylene production by the seeds was decreased to a large extent. These data provide evidence that dormancy breakage by Al3+ differs from that caused by low pH and is not associated with ethylene production. Similarly to Al3+ action, methyl viologen (MV), a reactive oxygen species-generating compound, broke dormancy of Townsville stylo seeds. Sodium selenate and N-acetyl cysteine, antioxidant compounds, largely decreased germination of MV- and Al3+-stimulated dormant seeds. Altogether these data point to oxidative radicals constituting key molecules in the chain of events triggered by Al3+ leading to dormancy breakage.

Keywords

aluminiumdormancyethyleneseedsreactive oxygen speciesStylosanthes humilis
Type
Research Article
Information
Seed Science Research , Volume 20 , Issue 3 , September 2010 , pp. 145 - 152
Copyright
Copyright © Cambridge University Press 2010

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