19 research outputs found
Stein--Sahi complementary series and their degenerations
The aim of the paper is an introduction to Stein--Sahi complementary series,
holomorphic series, and 'unipotent representations'. We also discuss some open
problems related to these objects. For the sake of simplicity, we consider only
the groups U(n,n).Comment: 40pp, 7fig, revised versio
Comparative analysis of thylakoid protein complexes in the mesophyll and bundle sheath cells from C 3
To better understand the coordination between dark and light reactions during the transition from C3 to C4 photosynthesis, we optimized a method for separating thylakoids from mesophyll (MC) and bundle sheath cells (BSC) across different plant species. We grew six Paniceae grasses including representatives from the C3, C3âC4 and C4photosynthetic types and all three C4 biochemical subtypes (NADPâME, NADâME and PEPCK) in addition to Zea mays under control conditions (1000 ÎŒmol quanta mâ2 sâ1 and 400 ppm of CO2). Proteomics analysis of thylakoids under native conditions, using BNâPAGE followed by LC/MS, demonstrated the presence of subunits of all lightâreaction related complexes in all species and cell types. C4 NADPâME species showed a higher PSI/PSII ratio and a clear accumulation of NDH complexes in BSCs, while Cytb6f was more abundant in BSCs of C4 NADâME species. The C4 PEPCK species showed no clear differences between cell types. Our study presents, for the first time, a good separation between BSC and MC for a C3âC4 intermediate grass which did not show noticeable differences in the distribution of the thylakoid complexes. For the NADPâME species P. antidotale, growth at glacial CO2 (180 ppm of CO2) had no effect on the distribution of the lightâreaction complexes, while growth at low light (200 ÎŒmol quanta mâ2 sâ1) promoted the accumulation of lightâharvesting proteins in both cell types. These results add to our understanding of thylakoid distribution across photosynthetic types and subtypes, and introduce thylakoid distribution between the MC and BSC of a C3âC4 intermediate species