@article{GendreBaralDangetal.2019, author = {Gendre, Delphine and Baral, Anirban and Dang, Xie and Esnay, Nicolas and Boutte, Yohann and Stanislas, Thomas and Vain, Thomas and Claverol, Stephane and Gustavsson, Anna and Lin, Deshu and Grebe, Markus and Bhalerao, Rishikesh P.}, title = {Rho-of-plant activated root hair formation requires Arabidopsis YIP4a/b gene function}, series = {Development : Company of Biologists}, volume = {146}, journal = {Development : Company of Biologists}, number = {5}, publisher = {The Company of Biologists}, address = {Cambridge}, issn = {0950-1991}, doi = {10.1242/dev.168559}, pages = {7}, year = {2019}, abstract = {Root hairs are protrusions from root epidermal cells with crucial roles in plant soil interactions. Although much is known about patterning, polarity and tip growth of root hairs, contributions of membrane trafficking to hair initiation remain poorly understood. Here, we demonstrate that the trans-Golgi network-localized YPT-INTERACTING PROTEIN 4a and YPT-INTERACTING PROTEIN 4b (YIP4a/b) contribute to activation and plasma membrane accumulation of Rho-of-plant (ROP) small GTPases during hair initiation, identifying YIP4a/b as central trafficking components in ROP-dependent root hair formation.}, language = {en} } @article{PoxsonKaradyGabrielssonetal.2017, author = {Poxson, David J. and Karady, Michal and Gabrielsson, Roger and Alkattan, Aziz Y. and Gustavsson, Anna and Doyle, Siamsa M. and Robert, Stephanie and Ljung, Karin and Grebe, Markus and Simon, Daniel T. and Berggren, Magnus}, title = {Regulating plant physiology with organic electronics}, series = {Proceedings of the National Academy of Sciences of the United States of America}, volume = {114}, journal = {Proceedings of the National Academy of Sciences of the United States of America}, publisher = {National Acad. of Sciences}, address = {Washington}, issn = {0027-8424}, doi = {10.1073/pnas.1617758114}, pages = {4597 -- 4602}, year = {2017}, abstract = {The organic electronic ion pump (OEIP) provides flow-free and accurate delivery of small signaling compounds at high spatio-temporal resolution. To date, the application of OEIPs has been limited to delivery of nonaromatic molecules to mammalian systems, particularly for neuroscience applications. However, many long-standing questions in plant biology remain unanswered due to a lack of technology that precisely delivers plant hormones, based on cyclic alkanes or aromatic structures, to regulate plant physiology. Here, we report the employment of OEIPs for the delivery of the plant hormone auxin to induce differential concentration gradients and modulate plant physiology. We fabricated OEIP devices based on a synthesized dendritic polyelectrolyte that enables electrophoretic transport of aromatic substances. Delivery of auxin to transgenic Arabidopsis thaliana seedlings in vivo was monitored in real time via dynamic fluorescent auxin-response reporters and induced physiological responses in roots. Our results provide a starting point for technologies enabling direct, rapid, and dynamic electronic interaction with the biochemical regulation systems of plants.}, language = {en} } @article{StanislasHuserBarbosaetal.2015, author = {Stanislas, Thomas and Huser, Anke and Barbosa, Ines C. R. and Kiefer, Christian S. and Brackmann, Klaus and Pietra, Stefano and Gustavsson, Anna and Zourelidou, Melina and Schwechheimer, Claus and Grebe, Markus}, title = {Arabidopsis D6PK is a lipid domain-dependent mediator of root epidermal planar polarity}, series = {Nature plants}, volume = {1}, journal = {Nature plants}, number = {11}, publisher = {Nature Publ. Group}, address = {London}, issn = {2055-026X}, doi = {10.1038/NPLANTS.2015.162}, pages = {9}, year = {2015}, abstract = {Development of diverse multicellular organisms relies on coordination of single-cell polarities within the plane of the tissue layer (planar polarity). Cell polarity often involves plasma membrane heterogeneity generated by accumulation of specific lipids and proteins into membrane subdomains. Coordinated hair positioning along Arabidopsis root epidermal cells provides a planar polarity model in plants, but knowledge about the functions of proteo-lipid domains in planar polarity signalling remains limited. Here we show that Rho-of-plant (ROP) 2 and 6, phosphatidylinositol-4-phosphate 5-kinase 3 (PIP5K3), DYNAMIN-RELATED PROTEIN (DRP) 1A and DRP2B accumulate in a sterol-enriched, polar membrane domain during root hair initiation. DRP1A, DRP2B, PIP5K3 and sterols are required for planar polarity and the AGCVIII kinase D6 PROTEIN KINASE (D6PK) is a modulator of this process. D6PK undergoes phosphatidylinositol-4,5-bisphosphate- and sterol-dependent basal-to-planar polarity switching into the polar, lipid-enriched domain just before hair formation, unravelling lipid-dependent D6PK localization during late planar polarity signalling.}, language = {en} }