The PLETHORA Genes Mediate Patterning of the Arabidopsis Root
Stem Cell Niche
Aida et al.
SHR protein is expressed in the cytoplasm and nuclei of cells in the stele, but exclusively in the nuclei
of the endodermis and quiescent center (not the cytoplasm)
Emergence of seedling pattern
Selectively missing early vasculature in mp heart stage emb
May be required to induce root meristem formation below:
Patterns of gene action in plant development revealed by enhancer
trap and gene trap transposable elements
S UN DARESAN
Describe here the development of an efficient insertional mutagenesis system in
Arabidopsis that permits identification
Genetic analysis of pattern formation in Arabidopsis embryo
A large-scale screen for morphologically abnormal seedling mutants yielded about 250
lines, and genetic evidence suggests saturation of the genome for this kind of mutatio
Cell Fate in the Arabidopsis Root Meristem Determines Directional
Berg et al.
Positional signals can be transmitted from more mature to initial cells to specify meristem cell
Initial cells are separated early in developm
Signalling Cell Fate in Plant Meristems
a l. (Review)
In plants, cell fate is determined by positional cues, but not by lineage
Leaves are formed at the SAM, which contains stem cells (totipotent: capable of giving rise to any cell
o The me
Organ Regeneration Does Not Require a Functional Stem Cell Niche in Plants
Sena et al.
Note: DR5 is an auxin maximum marker. ARF5 + ARF7 are expressed in the root tip and are responsible for
maintenance of the two QC specific markers: PLT1 + PLT2
Regulation of Phyllotaxis by Polar Auxin Transport
The regular arrangement of leaves around a plants stem is called phyllotaxis
Leaves and flowers are formed from the SAM, triggered by auxin
In plants Pin1 is found in the epidermis and t
The SHORT-ROOT Gene Controls Radial Patterning of the
Arabidopsis root through Radial Signalling
Helariutta et al.
STM is a mutant that doesnt form SAM, which results in fused or irregularly spaced cotyledons
In tissue culture, it is possible to make root
Regulation of preprocambial cell state acquisition by auxin signalling
in Arabidopsis leaves
Donner et al.
Vascular bundles in leaves is generated de novo during the development of each primordium from a
homogenous population of ground cells
o Forms in or
Formation of the shoot apical meristem in Arabidopsis: an analysis of
development in the wild type and in the shoot meristemless mutant
Barton et al.
The SAM consists of densely cytoplasmic, undifferentiated, dividing cells
o They can proliferate, replace
Plants homozygous for
shr or scr mutations form a single cell layer instead of two
Wt: Two layers
The inner cell layer of the
ground tissue is the endodermis and
layer is the cortex.
Single mutant layer
Phenotype of short root
and scarecrow muta