ARABIDOPSIS RESEARCH ROUNDUP: FEBRUARY 17TH
17th Feb 2016
This weeks Arabidopsis Research Roundup features papers that build upon a history of research in each featured lab. Firstly Gareth Jenkins from Glasgow continues to investigate mechanisms of UV-B signaling whilst Laila Moubayidin, now at the JIC, is involved in work that investigates the multiple factors that control root meristem size. Finally we present three protocol papers that are featured in a new collection of articles that focus on protocols that can be used to assess different environmental responses.
Findlay KM, Jenkins GI (2016) Regulation of UVR8 photoreceptor dimer/monomer photo-equilibrium in Arabidopsis plants grown under photoperiodic conditions. Plant Cell Environment http://dx.doi.org/10.1111/pce.12724 Open Access
The research group led by Gareth Jenkins (Glasgow) continues their work on the plant response to UV in this study that investigates the binding patterns of the UVR8 protein. UVR8 mediates the plant response to UV-B light and the protein either exists in a monomeric (active) or dimeric (inactive) form. This study shows that UVR8 maintains dimer/monomer photo-equilibrium through diurnal photoperiods and that the REPRESSOR OF UV-B PHOTOMORPHOGENESIS 1 (RUP1) and RUP2 proteins are necessary for maintaining this equilibrium. Interestingly they show that the UVR8 balance is tipped toward the monomeric form in lower temperatures. This shows that the protein does not act as a simple switch to signal for changes in UV-B as its effect is influenced by environmental parameters outside of the light source.
Moubayidin L, Salvi E, Giustini L, Terpstra I, Heidstra R, Costantino P, Sabatini S (2016) A SCARECROW-based regulatory circuit controls Arabidopsis thaliana meristem size from the root endodermis Planta http://dx.doi.org/10.1007/s00425-016-2471-0 Open Access
Laila Moubayidin now works as a postdoc with Lars Ostergaard at the JIC but this work is the result of research conducted with Sabrina Sabatini in Rome. In this study they continue the labs investigation into the role of the SCARECROW (SCR) protein in the control of root meristem size. They show that SCR, from endodermal cells, sustains a gibberellic acid signal by regulating RGA REPRESSOR OF ga1-3 (RGA) protein stability. This in turn controls the activity of the cytokinin responsive transcription factor ARR1 at the root transition zone. This activity therefore maintains a balance of cell division and differentiation that maintains correct meristem size.
A new edition of ‘Methods in Molecular Biology’ focuses on ‘Environmental Responses in Plants’ and includes a number of papers featuring UK authors who work on Arabidopsis.