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báo cáo khoa học: " Ethylene is involved in pistil fate by modulating the onset of ovule senescence and the GA-mediated fruit set in Arabidopsis"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Ethylene is involved in pistil fate by modulating the onset of ovule senescence and the GA-mediated fruit set in Arabidopsis | Carbonell-Bejerano et al. BMC Plant Biology 2011 11 84 http www.biomedcentral.com 1471-2229 11 84 BMC Plant Biology RESEARCH ARTICLE Open Access Ethylene is involved in pistil fate by modulating the onset of ovule senescence and the GA-mediated fruit set in Arabidopsis 1.2 2 2 2 2 Pablo Carbonell-Bejerano 1 Cristina Urbez Antonio Granell Juan Carbonell and Miguel A Perez-Amador Abstract Background Ovule lifespan is an important factor in determining the ability to set fruits and produce seeds. Once ovule senescence is established fruit set capacity in response to gibberellins GAs is lost. We aimed to elucidate whether ethylene plays a role in controlling ovule senescence and the fruit set response in Arabidopsis. Results Ethylene response inhibitors silver thiosulphate STS and 1-methylcyclopropene 1-MCP were able to delay the loss of pistil response to GA3. In addition ethylene insensitive mutants ein2-5 and ein3-1 showed delayed loss of pistil response as in plants treated with STS and 1-MCP while constitutive mutant ctr1-1 displayed premature loss of response. The analysis of the expression of ethylene biosynthesis genes suggests that ethylene is synthesised in ovules at the onset of ovule senescence while a transcriptional meta-analysis also supports an activated ethylene-dependent senescence upon the establishment of ovule senescence. Finally a SAG12 GUS reporter line proved useful to monitor ovule senescence and to directly demonstrate that ethylene specifically modulates ovule senescence. Conclusions We have shown that ethylene is involved in both the control of the ovule lifespan and the determination of the pistil fruit fate. Our data support a role of the ovule in modulating the GA response during fruit set in Arabidopsis. A possible mechanism that links the ethylene modulation of the ovule senescence and the GA3-induced fruit set response is discussed. Background The pistil is a highly specialised floral organ designed to facilitate fertilisation seed .