ARABIDOPSIS RESEARCH ROUND-UP
22nd Jan 2014
All of the papers in this week’s Arabidopsis Research Round-up are open access – enjoy!
- Hemsley PA, Hurst CH, Kaliyadasa E, Lamb R, Knight MR, De Cothi EA, Steele JF and Knight H. The Arabidopsis mediator complex subunits MED16, MED14, and MED2 regulate mediator and RNA Polymerase II recruitment to CBF-responsive cold-regulated genes. The Plant Cell, 17 December 2013. DOI: 10.1105/tpc.113.117796. [Open Access]
Here’s one we missed at the end of last year – apologies to last author Heather Knight, who is one of GARNet’s current committee members! Building on the previously known finding that the Mediator16 (MED16) subunit of the plant Mediator transcriptional coactivation complex regulates cold-responsive gene expression in Arabidopsis thaliana, the Durham team now demonstrate that MED16, MED2 and MED14 subunits are required for RNA polymerase II recruitment to C-repeat binding factor-responsive cold-regulated genes.
- Gehl B, Lee CP, Bota P, Blatt MR and Sweetlove LJ. An Arabidopsis stomatin-like protein affects mitochondrial respiratory supercomplex organisation. Plant Physiology, 8 January 2014. DOI: 10.1104/pp.113.230383. [Open Access]
Researchers at the Universities of Glasgow and Oxford here present evidence to support a role for Arabidopsis stomatin-like protein 1 (AtSLP1) in the organization of respiratory supercomplexes in Arabidopsis. Using reverse genetics in combination with biochemical methods, the team investigate the function of AtSLPs and found that both AtSLP1 and AtSLP2 localise to mitochondrial membranes.
- Fan X, Yang C, Klisch D, Ferguson A, Bhalerao R, Niu X and Wilson Z. ECHIDNA protein impacts in male fertility in Arabidopsis by mediating trans-Golgi-network secretory trafficking during anther and pollen development. Plant Physiology, 14 January 2014. DOI: 10.1104/pp.113.227769. [Open Access]
It has been known for some time why the ech Arabidopsis mutant exhibits a dwarf phenotype, but the associated reduced male fertility seen in this mutant was previously uncharacterised. Working with scientists from China and Sweden, a group of researchers from the University of Nottingham has now identified the basis for this semi-sterility: decreased anther size, reduced amounts of pollen, decreased pollen viability, and impaired anther opening and pollen tube growth. These reduced fertility traits are thought to be as a result of multi-faceted defects in the trans-Golgi network trafficking systems.
- Malinovsky FG, Batoux M, Schwessinger B, Youn JH, Stransfield L, Win J , Kim S-K and Zipfel C. Antagonistic regulation of growth and immunity by the Arabidopsis bHLH transcription factor HBI1. Plant Physiology, 16 January 2014. DOI: 10.1104/pp.113.234625. [Open Access]
GARNet committee member Cyril Zipfel and the Sainsbury Laboratory is last author on this Plant Physiology paper. With UK and Korean colleagues, Zipfel sheds more light on the genetic mechanisms underlying the trade-off between pathogen-associated molecular pattern (PAMP)-triggered immunity, and brassinosteroid (BR)-mediate growth in Arabidopsis.