Data/hora: 02/06/2024 01:05:14

Provedor de dados: | 51
País: | Argentina
Título: | Supraoptimal ethylene acts antagonistically with exogenous gibberellins during Solanum lycopersicum (Solanaceae) hypocotyl growth
Autores: | Mignolli,Francesco; Rojas,Graciela Beatriz; Vidoz,María Laura.
Data: | 2016-06-01
Ano: | 2016
Palavras-chave: | Ethylene; Gibberellins; Tomato; Hypocotyl elongation.
Resumo: | In many plant species, ethylene and gibberellins interact to regulate plant growth and development. In some cases, these hormones can act in a synergistic way whereas in others they can be antagonistic. To date, the control of hypocotyl elongation by ethylene and gibberellins has been poorly explored in tomato. In this paper, we report that, application of exogenous ethylene to tomato seedlings or high endogenous ethylene production, as in the epinastic mutant, strongly prevent the effect of gibberellic acid (GA3) application. Moreover, constitutive activation of gibberellin signal in a DELLA deficient mutant is not able to counteract the inhibitory effect of ethylene on hypocotyl elongation, suggesting that ethylene acts independently from DELLA-mediated gibberellin response. Interestingly, when ethylene perception is blocked, the GA3 promotive effect on hypocotyl length is less effective, indicating that the presence of a basal level of ethylene could synergistically enhance hypocotyl growth. Taken together, these observations may suggest that, in tomato, supraoptimal concentrations of ethylene are able to antagonize gibberellin effect but normal levels seem to promote gibberellin-induced hypocotyl elongation.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722016000200004
Editor: | Sociedad Argentina de Botánica
Formato: | text/html
Fonte: | Boletín de la Sociedad Argentina de Botánica  v.51 n.2 2016
Fonte: | info:eu-repo/semantics/openAccess