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8/3/04 (VJC) Recommendation
of new papers in the past several months for Faculty 1000.
JASMONATE-INSENSITIVE1 encodes a MYC transcription
factor essential to discriminate between different jasmonate-regulated
defense responses in Arabidopsis.
Lorenzo O, Chico JM, Sánchez-Serrano JJ, Solano R
Plant Cell 2004 Jul 16(7):1938-1950
This study reports a very interesting and exciting finding that the
Arabidopsis JASMONATE-INSENSITIVE1 (JIN1) encodes AtMYC2 that is activate
by JA and differentially regulates the expression of two groups of
JA-induced genes. One group of genes in wounding responses (e.g.,
VSP2) are activated by AtMYC2 but are repressed by ERF1 and ethylene
signaling. The other group of genes (e.g., PDF1.2) are involved in
defense responses and are repressed by AtMYC2 but activated by ERF1
and ethylene signaling. Since AtMYC2 is also activated by ABA and
important for a branch of ABA signaling, the complex interactions
in the JA, ethylene and ABA signaling network deserve further investigation.
MAPMAN: a user-driven tool to display
genomics data sets onto diagrams of metabolic pathways and other biological
processes.
Thimm O, Bläsing O, ..., Rhee SY, Stitt M
Plant J 2004 Mar 37(6):914-39
MAPMAN is a very useful new tool to facilitate biological interpretation
of large data sets and form experimentally testable hypothesis by
displaying gene expression and metabolite profiling information onto
organized diagrams of key metabolic pathways and important biological
processes and regulatory pathways. Its user-driven and modular structure
allows users to edit existing >200 hierarchical categories, add
new categories, and develop SCAVENGER modules for new data analysis.
MAPMAN adds new power to the commonly used clustering and AraCyc tools
for global gene expression data analysis and data mining specifically
designed for plants. A
Haplotype-Specific Resistance Gene Regulated by BONZAI1 Mediates Temperature-Dependent
Growth Control in Arabidopsis
Shuhua Yang and Jian Hua
The Plant Cell, Vol. 16, 1060¡V1071, April 2004
The work reveals an important regulatory role of BONZAI1 (BON1) in
connecting temperature-dependent growth control and the repression
of a TIR-NBS-LRR resistance gene SNC1 signaling. The growth defect
of bon1-1 is a result of constitutive defense signaling involving
EDS1, an EDS1 homologue, PAD4, SID2/ICS and SA in a positive feedback
loop but not NDR1 required for some CC-NBS-LRR signaling.
Bacterial disease resistance in Arabidopsis
through flagellin perception
Cyril Zipfel, Silke Robatzek, Lionel Navarro, Edward J. Oakeley, Jonathan
D. G. Jones, Georg Felix1 & Thomas Boller
NATURE 428, 764, 2004
This paper demonstrated conclusively the importance of pathogen-associated
molecular patterns (PAMPs) in plant disease resistance. It is shown
that treatment of flg22 (an active flagellin peptide elicitor) and
crude bacterial extracts enhanced resistance to bacterial pathogens
even in the absence of the flg22 receptor, indicating the existence
of functional perception systems for multiple PAMPs. Global gene expression
and mutant analyses suggested that the flg22-induced resistance was
mostly independent of salicylic acid, jasmonic acid and ethylene signaling.
A protein kinase target of a PDK1
signalling pathway is involved in root hair growth in Arabidopsis
Anthony RG, Henriques R, ..., Koncz C, Bögre L EMBO J
2004 Feb 11 23(3):572-81
This paper reports the first Arabidopsis protein kinase cascade in
lipid signaling, consisting the 3¡¦-phophoinositide-dependent kinase
(AtPDK1) and a specific AGC kinase AGC2-1 acting downstream of phosphatidic
acid (PA) involved in stress and hormonal signaling. It is shown that
AGC2-1 is abundant in dividing cells and fast-growing organs, and
plant hormone auxin and cytokinin synergistically activate the AtPDK1-regulated
AGC2-1 kinase, suggesting a role in cell cycle and growth. The agc2-1
loss-of-function mutant shows reduced root hair growth and development.
A MAPKK Kinase Gene Regulates Extra-Embryonic
Cell Fate in Arabidopsis Wolfgang Lukowitz,
Adrienne Roeder, Dana Parmenter, and Chris Somerville
Cell, Vol. 116, 109¡V119, January 9, 2004
An Arabidopsis MAP kinase kinase kinase (MAPKKK) gene YODA has been
discovered to execute the first cell fate decision for basal lineage,
which forms the extra-embryonic suspensor after the asymmetric division
of the zygote. Expression of the constitutively active YODA could
suppress proembryo formation and the loss-of-function mutants also
exhibit abnormal embryogenesis and postembryonic development. Since
YODA transcript is expressed ubiquitously and the same MAPKKK could
often function in distinct MAPK pathways, it is possible that YODA
might have other important functions throughout embryogenesis and
plant development. |
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