Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/19924
Tipo: Artigo
Título: Germination of salt-stressed seeds as related to the ethylene biosynthesis ability in three Stylosanthes species
Autor(es): Silva, Priscila O.
Medina, Eduardo F.
Barros, Raimundo S.
Ribeiro, Dimas M.
Abstract: Stylosanthes, a genus of tropical forage legume, is known to exhibit good persistence in saline soils, yet mechanisms for regulation of seed germination under salt stress are poorly understood. This study was carried out to evaluate the mode of action of salt stress on seed germination of Stylosanthes. 1-Aminocyclopropane-1-carboxylic acid (ACC) increased ethylene biosynthesis and germination of NaCl-inhibited seeds in a dose-dependent manner. Contents of ACC and germination of Stylosanthes humilis seeds increased following transfer from NaCl solution to deionised water, but not after transfer to l-α-(2-aminoethoxyvinyl)-glycine (AVG) solution, an inhibitor of ethylene biosynthesis. Ethylene biosynthesis was much larger in NaCl-treated seeds of Stylosanthes guianensis than in seeds of S. humilis and Stylosanthes capitata, a fact which was reflected in higher germination rates. S. guianensis seedlings also displayed higher growth and survival rates than S. humilis and S. capitata under salt stress. Moreover, smaller ACC levels, as well as reduced ethylene biosynthesis of S. capitata seeds were accompanied by lower germination under salt stress. In addition, S. capitata seedlings treated with NaCl solutions exhibited relatively lower growth and survival rates in comparison with S. humilis and S. guianensis. Thus, different abilities to synthesize ethylene by S. guianensis, S. humilis and S. capitata seeds explain the differences in tolerance to salt stress of the three species.
Palavras-chave: 1-Aminocyclopropane-1-carboxylic acid
Ethylene
Salt stress
Seed germination
Stylosanthes
Editor: Journal of Plant Physiology
Tipo de Acesso: Elsevier GmbH
URI: https://doi.org/10.1016/j.jplph.2013.09.004
http://www.locus.ufv.br/handle/123456789/19924
Data do documento: 11-Out-2013
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