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https://locus.ufv.br//handle/123456789/23309
Tipo: | Artigo |
Título: | Dormancy breakage of Stylosanthes humilis seeds by aluminium |
Autor(es): | Ribeiro, Dimas M. Mapeli, Ana M. Carnelossi, Marcelo A. G. Delatorre, Carla A. Barros, Raimundo S. |
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. |
Palavras-chave: | Aluminium Dormancy Ethylene Reactive oxygen species Stylosanthes humilis Seeds |
Editor: | Seed Science Research |
Tipo de Acesso: | Open Access |
URI: | http://dx.doi.org/10.1017/S0960258510000164 http://www.locus.ufv.br/handle/123456789/23309 |
Data do documento: | Set-2010 |
Aparece nas coleções: | Artigos |
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artigo.pdf | texto completo | 152,31 kB | Adobe PDF | Visualizar/Abrir |
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