A non-cell-autonomous mechanism for the control of plant architecture and epidermal differentiation involves intercellular trafficking of BREVIPEDICELLUS protein

Functional Plant Biology : FPB
Yeonggil RimJae-Yean Kim

Abstract

Intercellular trafficking of maize KNOTTED1 and its homologous KNOTTED1-related homeobox (KNOX) proteins has been reported; however, little is known about the functional significance of KNOX trafficking in plant development. In this study, we showed that intercellular movement of BREVIPEDICELLUS (BP or KNAT1), the closest Arabidopsis homologue of KNOTTED1, is tissue-specific and takes place through a selective pathway. When BP was fused to a red fluorescent mCherry construct, it could move from the mesophyll to epidermal cells of leaves, although it could not move out from the cortex/endodermis of roots. Using a trichome rescue-trafficking assay, we also showed that BP fusion could confer gain-of-trafficking function to the cell-autonomous GLABROUS1 (GL1) protein. In the wild type, BP transcripts are expressed in the sub-epidermal cortical cell layers of the inflorescence stem and pedicel. However, bp mutant phenotypes include defects in epidermal cell differentiation suggesting a non-cell-autonomous function. Expression of a GFP:BP fusion under the control of a BP promoter specific to the stem cortex layers resulted in epidermal GFP fluorescence suggesting its movement from subepidermis to epidermis. Here, we provide evidence ...Continue Reading

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Citations

Dec 19, 2013·Journal of Experimental Botany·Xiao HanJae-Yean Kim
Aug 29, 2012·Journal of Integrative Plant Biology·Michitaka NotaguchiWilliam J Lucas
Sep 29, 2015·The Plant Journal : for Cell and Molecular Biology·Yuchen LongIkram Blilou
Apr 15, 2018·The Plant Journal : for Cell and Molecular Biology·Nadja GerlitzRuth Stadler
Oct 8, 2014·Annual Review of Cell and Developmental Biology·Kimberly L GallagherChin-Mei Lee
Sep 15, 2009·Trends in Cell Biology·William J LucasJae-Yean Kim

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