Arabidopsis exocyst subunits SEC8 and EXO70A1 and exocyst interactor ROH1 are involved in the localized deposition of seed coat pectin

0350472 - ÚEB 2011 RIV GB eng J - Journal Article
Kulich, I. - Cole, R. - Drdová, Edita - Cvrčková, F. - Soukup, A. - Fowler, J. - Žárský, Viktor
Arabidopsis exocyst subunits SEC8 and EXO70A1 and exocyst interactor ROH1 are involved in the localized deposition of seed coat pectin.
New Phytologist. Roč. 188, č. 2 (2010), s. 615-625. ISSN 0028-646X. E-ISSN 1469-8137
R&D Projects: GA MŠMT ME 841; GA MŠMT(CZ) LC06034
Institutional research plan: CEZ:AV0Z50380511
Keywords : Arabidopsis * cell wall * exocyst
Subject RIV: EF - Botanics
Impact factor: 6.516, year: 2010

Polarized deposition of cell wall pectins is a key process in Arabidopsis thaliana myxospermous seed coat development. The exocyst complex has recently been shown to be involved in the regulation of cell polarity in plants. Here, we used the Arabidopsis seed coat to study the role of the exocyst in polarized pectin delivery. Using a yeast two-hybrid screen, we identified a new interactor of the exocyst subunit Exo70A1, termed Roh1. T-DNA insertions in SEC8, EXO70A1 caused deviations from normal seed coat development, in particular reduced pectin deposition. A gain-of-function mutation of ROH1 also caused reduced pectin deposition. Interestingly, we observed a systematic difference in seed coat development between primary and secondary inflorescences in wild-type plants: siliques from secondary branches produced seeds with thicker seed coats. The participation of exocyst subunits in mucilage deposition provides evidence for the role of the exocyst in polarized cell wall morphogenesis.
Permanent Link: http://hdl.handle.net/11104/0190472