Conserved signalling components coordinate epidermal patterning and cuticle deposition in barley

Linsan Liu, Sarah B. Jose, Chiara Campoli, Micha M. Bayer, Miguel A. Sánchez-Diaz, Trisha McAllister, Yichun Zhou, Mhmoud Eskan, Linda Milne, Miriam Schreiber, Thomas Batstone, Ian D. Bull, Luke Ramsay, Penny Wettstein-Knowles, Robbie Waugh, Alistair M. Hetherington and Sarah M. McKim ()
Additional contact information
Linsan Liu: University of Dundee
Sarah B. Jose: University of Bristol
Chiara Campoli: University of Dundee
Micha M. Bayer: James Hutton Institute
Miguel A. Sánchez-Diaz: University of Dundee
Trisha McAllister: University of Dundee
Yichun Zhou: University of Dundee
Mhmoud Eskan: University of Dundee
Linda Milne: James Hutton Institute
Miriam Schreiber: James Hutton Institute
Thomas Batstone: University of Bristol
Ian D. Bull: University of Bristol
Luke Ramsay: James Hutton Institute
Penny Wettstein-Knowles: University of Copenhagen
Robbie Waugh: University of Dundee
Alistair M. Hetherington: University of Bristol
Sarah M. McKim: University of Dundee

Nature Communications, 2022, vol. 13, issue 1, 1-18

Abstract: Abstract Faced with terrestrial threats, land plants seal their aerial surfaces with a lipid-rich cuticle. To breathe, plants interrupt their cuticles with adjustable epidermal pores, called stomata, that regulate gas exchange, and develop other specialised epidermal cells such as defensive hairs. Mechanisms coordinating epidermal features remain poorly understood. Addressing this, we studied two loci whose allelic variation causes both cuticular wax-deficiency and misarranged stomata in barley, identifying the underlying genes, Cer-g/ HvYDA1, encoding a YODA-like (YDA) MAPKKK, and Cer-s/ HvBRX-Solo, encoding a single BREVIS-RADIX (BRX) domain protein. Both genes control cuticular integrity, the spacing and identity of epidermal cells, and barley’s distinctive epicuticular wax blooms, as well as stomatal patterning in elevated CO2 conditions. Genetic analyses revealed epistatic and modifying relationships between HvYDA1 and HvBRX-Solo, intimating that their products participate in interacting pathway(s) linking epidermal patterning with cuticular properties in barley. This may represent a mechanism for coordinating multiple adaptive features of the land plant epidermis in a cultivated cereal.

Date: 2022
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DOI: 10.1038/s41467-022-33300-1

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