A cellular expression map of epidermal and subepidermal cell layer‐enriched transcription factor genes integrated with the regulatory network in Arabidopsis shoot apical meristem

Abstract

One of the challenges in developmental biology is to understand how the expression pattern of TFs linked to cell fate specification and tissue specialization are established and maintained. In angiosperms, cell fate specification events first take place in embryonic development. Lateral organs are formed in the shoot apex in postembryonic development. Cell type specifications occur independently in the newly formed organs with barring a few exceptions (Barton, 2010).

Leaf Epidermis: The Ambiguous Symplastic Domain

“…Determination of cell fate and specification of cell layers in SAMs as well as in leaves during their development requires precise regulation of symplastic exchange between cells. A whole orchestra of regulators, such as transcription factors, RNA, and small molecules like hormones move through PD enabling SAM functioning as well as proper development of leaves from leaf primordia (Kitagawa and Jackson, 2017 ; Liu and Chen, 2018 ; Bhatia et al, 2021 ; Maksimova et al, 2021 ; Romanova et al, 2021 ). Moreover, also in the mature leaves, exchange of regulatory molecules as well as assimilates between cells and tissues via PD is a highly important and finely tuned process (Cui et al, 2014 ; Liu and Chen, 2018 ; Dmitrieva et al, 2021 ).…”

New Horizons in Plant Cell Signaling

“…As the boundary between the plant and the external environment, the plant epidermis is not just a barrier that protects the plant against pathogens, but it also regulates exchange of water, nutrients, and gases crucial for growth and development processes [ 86 , 87 ]. The mechanisms involved in transcriptional regulation of epidermal cells in processes such as shoot growth, lipid metabolism and cuticle synthesis, as well as defense responses, are largely unknown [ 88 ]. Wang et al, 2020 [ 89 ] dissected the promoter of Triticum aestivum lipid transfer protein 1 (TaLTP1) by generating multiple deletion constructs and studying their activities in transgenic Arabidopsis thaliana and Brachypodium distachyon .…”