Conservation and divergence of YODA MAPKKK function in regulation of grass epidermal patterning

Author:

Abrash Emily1ORCID,Anleu Gil M. Ximena1,Matos Juliana L.12,Bergmann Dominique C.13ORCID

Affiliation:

1. Department of Biology, Stanford University, Stanford, CA 94305-5020, USA

2. Present address: University of California Berkeley, Innovative Genomics Institute; Plant and Microbial Biology, Berkeley, CA 94720, USA

3. Howard Hughes Medical Institute (HHMI), Stanford University, Stanford, CA 94305-5020, USA

Abstract

All multicellular organisms must properly pattern cell types to generate functional tissues and organs. The organized and predictable cell lineages of the Brachypodium leaf enabled us to characterize the role of the MAPK kinase kinase gene BdYODA1 in regulating asymmetric cell divisions. We find that YODA genes promote normal stomatal spacing patterns in both Arabidopsis and Brachypodium, despite species-specific differences in those patterns. Using lineage tracing and cell fate markers, we show that, unexpectedly, patterning defects in bdyoda1 mutants do not arise from faulty physical asymmetry in cell divisions but rather from improper enforcement of alternative cellular fates after division. These cross-species comparisons allow us to refine our interpretations of MAPK activities during plant asymmetric cell divisions.

Funder

Howard Hughes Medical Institute

Publisher

The Company of Biologists

Subject

Developmental Biology,Molecular Biology

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