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GDSL-domain containing proteins mediate suberin biosynthesis and degradation, enabling developmental plasticity of the endodermis during lateral root emergence

By Robertas Ursache, Cristovao De Jesus Vieira-Teixeira, Valérie Dénervaud Tendon, Kay Gully, Damien De Bellis, Emanuel Schmid-Siegert, Tonni Grube Andersen, Vinay Shekhar, Sandra Calderon, Sylvain Pradervand, Christiane Nawrath, Niko Geldner, Joop EM Vermeer

Posted 27 Jun 2020
bioRxiv DOI: 10.1101/2020.06.25.171389

Roots anchor plants and deliver water and nutrients from the soil. The root endodermis provides the crucial extracellular diffusion barrier by setting up a supracellular network of lignified cell walls, called Casparian strips, supported by a subsequent formation of suberin lamellae. Whereas lignification is thought to be irreversible, formation of suberin lamellae was demonstrated to be dynamic, facilitating adaptation to different soil conditions. Plants shape their root system through the regulated formation of lateral roots emerging from within the endodermis, requiring local breaking and re-sealing of the endodermal diffusion barriers. Here, we show that differentiated endodermal cells have a distinct auxin-mediated transcriptional response that regulates cell wall remodelling. Based on this data set we identify a set of GDSL-lipases that are essential for suberin formation. Moreover, we find that another set of GDSL-lipases mediates suberin degradation, which enables the developmental plasticity of the endodermis required for normal lateral root emergence. ### Competing Interest Statement The authors have declared no competing interest.

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