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Emerging Role of the Ubiquitin Proteasome System in the Control of Shoot Apical Meristem Function

Journal of Integrative Plant Biology 2013年第1期55卷 7-20页

作者： Elisabetta Di Giacomo giovanna Serino giovanna frugis Istituto di Biologia e Biotecnologia Agraria UOS RomaConsiglio Nazionale delle RicercheMonterotondo Scalo Dipartimento di Biologia e Biotecnologie Charles Darwin Sapienza Università The New York Botanical Garden Genomics Program NYBGBronx

The shoot apical meristem （SAM） is a population of undifferentiated cells at the tip of the shoot axis that establishes early during plant embryogenesis and gives rise to all shoot organs throughout the plant＇s life. A plethora of different families of transcription factors （TFs） play a key role in establishing the equilibrium between cell differentiation and stem cell maintenance in the SAM. Fine tuning of these regulatory proteins is crucial for a proper and fast SAM response to environmental and hormonal cues, and for development progression. One effective way to rapidly inactivate TFs involves regulated proteolysis by the ubiquitin/26S proteasome system （UPS）. However, a possible role of UPS-dependent protein degradation in the regulation of key SAM TFs has not been thoroughly investigated. Here, we summarize recent evidence supporting a role for the UPS in SAM maintenance and function. We integrate this survey with an in silico analysis of publicly-available microarray databases which identified ubiquitin ligases that are expressed in specific areas within the SAM, suggesting that they may regulate or act downstream of meristem-specific factors.

关键词： Arabidopsis thaliana cell differentiation protein degradation shoot apical meristem ubiquitin/26S proteasome system.

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Transcriptome driven characterization of curly-and smooth-leafed endives reveals molecular differences in the sesquiterpenoid pathway

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Horticulture Research 2019年第1期6卷 1715-1733页

作者： Giulio Testone Giovanni Mele Elisabetta di Giacomo Gian Carlo Tenore Maria Gonnella Chiara Nicolodi giovanna frugis Maria Adelaide Iannelli Giuseppe Arnesi Alessandro Schiappa Tiziano Biancari Donato Giannino Institute of Agricultural Biology and Biotechnology Unit of RomeNational Research Council of Italy(CNR)RomeItaly Department of Pharmacy University of Naples Federico IINapoliNAItaly Institute of Sciences of Food Production CNRBariItaly Enza Zaden Italia TarquiniaViterboItaly

Endives(Cichorium endivia L.)are popular vegetables,diversified into curly/frisée-and smooth/broad-leafed(escaroles)cultivar types(cultigroups),and consumed as fresh and bagged *** are rich in sesquiterpene lactones(STL)that exert proven function on bitter taste and human *** assembly of a reference transcriptome of 77,022 unigenes and RNA-sequencing experiments were carried out to characterize the differences between endives and escaroles at the gene structural and expression levels.A set of 3177 SNPs distinguished smooth from curly cultivars,and an SNP-supported phylogenetic tree separated the cultigroups into two distinct clades,consistently with the botanical varieties of origin(crispum and latifolium,respectively).A pool of 699 genes maintained differential expression pattern(core-DEGs)in pairwise comparisons between curly vs smooth cultivars grown in the same *** annotation allowed the identification of 26 genes in the sesquiterpenoid biosynthesis pathway,which included several germacrene A synthase,germacrene A oxidase and costunolide synthase members(GAS/GAO/COS module),required for the synthesis of costunolide,a key precursor of lactucopicrin-and lactucin-like sesquiterpene *** core-DEGs contained a GAS gene(contig83192)that was positively correlated with STL levels and recurrently more expressed in curly than smooth endives,suggesting a cultigroup-specific *** significant positive correlation of GAS/GAO/COS transcription and STL abundance(2.4-fold higher in frisée endives)suggested that sesquiterpenoid pathway control occurs at the transcriptional *** on correlation analyses,five transcription factors(MYB,MYB-related and WRKY)were inferred to act on contig83192/GAS and specific STL,suggesting the occurrence of two distinct routes in STL biosynthesis.

关键词： STL cultivar maintained

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