The Physcomitrella patens exocyst subunit EXO70.3d has distinct roles in growth and development, and is essential for completion of the moss life cycle

0479103 - ÚEB 2018 RIV US eng J - Journal Article
Rawat, Anamika - Brejšková, Lucie - Hála, Michal - Cvrčková, F. - Žárský, Viktor
The Physcomitrella patens exocyst subunit EXO70.3d has distinct roles in growth and development, and is essential for completion of the moss life cycle.
New Phytologist. Roč. 216, č. 2 (2017), s. 438-454. ISSN 0028-646X. E-ISSN 1469-8137
R&D Projects: GA ČR(CZ) GA15-14886S
Grant - others:GA MŠk(CZ) LO1417
Institutional support: RVO:61389030
Keywords : auxin * cytokinesis * egg cell development * exo70 * exocyst * phylogeny * Physcomitrella patens * secretory pathway
OECD category: Plant sciences, botany
Impact factor: 7.433, year: 2017

The exocyst, an evolutionarily conserved secretory vesicle-tethering complex, spatially controls exocytosis and membrane turnover in fungi, metazoans and plants. The exocyst subunit EXO70 exists in multiple paralogs in land plants, forming three conserved clades with assumed distinct roles. Here we report functional analysis of the first moss exocyst subunit to be studied, Physcomitrella patens PpEXO70.3d (Pp1s97_91V6), from the, as yet, poorly characterized EXO70.3 clade. Following phylogenetic analysis to confirm the presence of three ancestral land plant EXO70 clades outside angiosperms, we prepared and phenotypically characterized loss-of-function Ppexo70.3d mutants and localized PpEXO70.3d in vivo using green fluorescent protein-tagged protein expression. Disruption of PpEXO70.3d caused pleiotropic cell elongation and differentiation defects in protonemata, altered response towards exogenous auxin, increased endogenous IAA concentrations, along with defects in bud and gametophore development. During mid-archegonia development, an abnormal egg cell is formed and subsequently collapses, resulting in mutant sterility. Mutants exhibited altered cell wall and cuticle deposition, as well as compromised cytokinesis, consistent with the protein localization to the cell plate. Despite some functional redundancy allowing survival of moss lacking PpEXO70.3d, this subunit has an essential role in the moss life cycle, indicating sub-functionalization within the moss EXO70 family.
Permanent Link: http://hdl.handle.net/11104/0275134