Abstract

Gibberellins (GAs) and ethylene are involved in many aspects of plant growth and development. Bioactive GAs are associated with many processes in higher plants, such as seed germination, leaf expansion, stem elongation and flower development. Like gibberellins, ethylene are involved in the regulation of diverse developmental processes, including seed germination, seedling growth, leaf and petal abscission, fruit ripening, cell elongation, flower senescence sex determination and pathogen responses. The physiological role of plant hormones has been investigated for many years, but the interaction between plant hormones is not well understood. Recently, we found that activated ethylene signaling reduces bioactive GA levels, thus enhancing the accumulation of DELLAs and ethylene acts on DELLAs via the CTR1-dependent ethylene response pathway (Achard et al., 2007) and double mutants gaixeto2-1 had enhanced content of active GA(4) at both the seedling and the rosette stages (De Grauwe et al. 2008). In present study we have analyzed the effect of ethylenegibberellins interaction on the content of gibberellins by using different ethylene and GA signal transduction mutants, as well as double mutants. Our results show that ethylene can promote plant growth and development through stimulation gibberellins biosynthesis.