ER-localized auxin transporter PIN8 regulates auxin homeostasis and male gametophyte development in Arabidopsis

Zhaojun Ding, Bangjun Wang, Ignacio Moreno, Nikoleta Dupláková, Sibu Simon, Nicola Carraro, Jesica Reemmer, Aleš Pěnčík, Xu Chen, Ricardo Tejos, Petr Skůpa, Stephan Pollmann, Jozef Mravec, Jan Petrášek, Eva Zažímalová, David Honys, Jakub Rolčík, Angus Murphy, Ariel Orellana, Markus Geisler and Jiří Friml ()
Additional contact information
Zhaojun Ding: Ghent University
Bangjun Wang: Plant Biology, University of Fribourg
Ignacio Moreno: Center for Genome Regulation, Center of Plant Biotechnology, Facultad de Ciencias Biologicas, Universidad Andres Bello
Nikoleta Dupláková: Institute of Experimental Botany ASCR
Sibu Simon: Ghent University
Nicola Carraro: Purdue University
Jesica Reemmer: Purdue University
Aleš Pěnčík: Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University
Xu Chen: Ghent University
Ricardo Tejos: Ghent University
Petr Skůpa: Institute of Experimental Botany ASCR
Stephan Pollmann: Ruhr-Universität Bochum, Lehrstuhl für Pflanzenphysiologie
Jozef Mravec: Ghent University
Jan Petrášek: Institute of Experimental Botany ASCR
Eva Zažímalová: Institute of Experimental Botany ASCR
David Honys: Institute of Experimental Botany ASCR
Jakub Rolčík: Laboratory of Growth Regulators, Centre of the Region Haná for Biotechnological and Agricultural Research, Faculty of Science, Palacký University
Angus Murphy: Purdue University
Ariel Orellana: Center for Genome Regulation, Center of Plant Biotechnology, Facultad de Ciencias Biologicas, Universidad Andres Bello
Markus Geisler: Plant Biology, University of Fribourg
Jiří Friml: Ghent University

Nature Communications, 2012, vol. 3, issue 1, 1-11

Abstract: Abstract Auxin is a key coordinative signal required for many aspects of plant development and its levels are controlled by auxin metabolism and intercellular auxin transport. Here we find that a member of PIN auxin transporter family, PIN8 is expressed in male gametophyte of Arabidopsis thaliana and has a crucial role in pollen development and functionality. Ectopic expression in sporophytic tissues establishes a role of PIN8 in regulating auxin homoeostasis and metabolism. PIN8 co-localizes with PIN5 to the endoplasmic reticulum (ER) where it acts as an auxin transporter. Genetic analyses reveal an antagonistic action of PIN5 and PIN8 in the regulation of intracellular auxin homoeostasis and gametophyte as well as sporophyte development. Our results reveal a role of the auxin transport in male gametophyte development in which the distinct actions of ER-localized PIN transporters regulate cellular auxin homoeostasis and maintain the auxin levels optimal for pollen development and pollen tube growth.

Date: 2012
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DOI: 10.1038/ncomms1941

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