Developmental plasticity of Arabidopsis hypocotyl is dependent on exocyst complex function

0502533 - ÚEB 2019 RIV GB eng J - Journal Article
Drdová, Edita - Klejchová, Martina - Janko, Karel - Hála, Michal - Soukupová, Hana - Cvrčková, F. - Žárský, Viktor
Developmental plasticity of Arabidopsis hypocotyl is dependent on exocyst complex function.
Journal of Experimental Botany. Roč. 70, č. 4 (2019), s. 1255-1265. ISSN 0022-0957. E-ISSN 1460-2431
Grant - others:OPPK(XE) CZ.2.16/3.1.00/21519
Institutional support: RVO:61389030 ; RVO:67985904
Keywords : auxin transport * root * growth * gene * elongation * expression * glabra2 * efflux * plants * roles * Arabidopsis thaliana * auxin * collet * etiolated hypocotyl * exocyst * root-hypocotyl junction * starch accumulation
OECD category: Cell biology
Impact factor: 5.908, year: 2019

The collet (root-hypocotyl junction) region is an important plant transition zone between soil and atmospheric environments. Despite its crucial importance for plant development, little is known about how this transition zone is specified. Here we document the involvement of the exocyst complex in this process. The exocyst, an octameric tethering complex, participates in secretion and membrane recycling and is central to numerous cellular and developmental processes, such as growth of root hairs, cell expansion, recycling of PIN auxin efflux carriers and many others. We show that dark-grown Arabidopsis mutants deficient in exocyst subunits can form a hair-bearing ectopic collet-like structure above the true collet, morphologically resembling the true collet but also retaining some characteristics of the hypocotyl. The penetrance of this phenotypic defect is significantly influenced by cultivation temperature and carbon source, and is related to a defect in auxin regulation. These observations provide new insights into the regulation of collet region formation and developmental plasticity of the hypocotyl.
Permanent Link: http://hdl.handle.net/11104/0294447