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Regulatory function of homeodomain‐leucine zipper ( HD ‐ ZIP) family proteins during embryogenesis
Author(s) -
Roodbarkelari Farshad,
Groot Edwin P.
Publication year - 2017
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/nph.14132
Subject(s) - leucine zipper , homeobox , meristem , biology , microbiology and biotechnology , transcription factor , auxin , embryogenesis , bzip domain , embryo , emx2 , genetics , gene
Summary Homeodomain‐leucine zipper proteins ( HD ‐ ZIP s) form a plant‐specific family of transcription factors functioning as homo‐ or heterodimers. Certain members of all four classes of this family are involved in embryogenesis, the focus of this review. They support auxin biosynthesis, transport and response, which are in turn essential for the apical–basal patterning of the embryo, radicle formation and outgrowth of the cotyledons. They transcriptionally regulate meristem regulators to maintain the shoot apical meristem once it is initiated. Some members are specific to the protoderm, the outermost layer of the embryo, and play a role in shoot apical meristem function. Within classes, homeodomain‐leucine zippers tend to act redundantly during embryo development, and there are many examples of regulation within and between classes of homeodomain‐leucine zippers. This indicates a complex network of regulation that awaits future experiments to uncover.