Arabidopsis stomatal initiation is controlled by MAPK-mediated regulation of the bHLH SPEECHLESS.
TL;DR: It is found that a unique domain in a basic helix-loop-helix (bHLH) stomatal initiating factor, SPEECHLESS, renders it a MAPK phosphorylation target in vitro and modulates its function in vivo.
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Abstract: Stomata, epidermal structures that modulate gas exchange between plants and the atmosphere, play critical roles in primary productivity and the global climate. Positively acting transcription factors and negatively acting mitogen-activated protein kinase (MAPK) signaling control stomatal development in Arabidopsis; however, it is not known how the opposing activities of these regulators are integrated. We found that a unique domain in a basic helix-loop-helix (bHLH) stomatal initiating factor, SPEECHLESS, renders it a MAPK phosphorylation target in vitro and modulates its function in vivo. MAPK cascades modulate a diverse set of activities including development, cell proliferation, and response to external stresses. The coupling of MAPK signaling to SPEECHLESS activity provides cell type specificity for MAPK output while allowing the integration of multiple developmental and environmental signals into the production and spacing of stomata.
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Citations
Establishing asymmetry: stomatal division and differentiation in plants.
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TL;DR: In this article, an emerging picture of how intrinsic molecules drive stomatal asymmetric cell division in multidimensions, from transcriptional activities in the nucleus to the dynamic assembly of the polarity complex at the cell cortex, is described.
35
Interaction between two rice mitogen activated protein kinases and its possible role in plant defense.
Arsheed Hussain Sheikh,Badmi Raghuram,Siddhi Kashinath Jalmi,Dhammaprakash Pandhari Wankhede,Pallavi Singh,Alok Krishna Sinha +5 more
TL;DR: A novel interaction between two rice MAPKs, Os MPK20-4 and OsMPK3 is reported suggesting the complex nature of the pathway rather than a linear one at individual steps, thereby opening a new dimension to the MAPK signal transduction.
A HD-ZIP transcription factor specifies fates of multicellular trichomes via dosage-dependent mechanisms in tomato.
Minliang Wu,Jiang Chang,Xiaoqian Han,Jingyuan Shen,Liling Yang,Shourong Hu,Benben Huang,Huimin Xu,Mengyuan Xu,Shurong Wu,Pengxue Li,Bin Hua,Meina Yang,Zhenbiao Yang,Shuang Wu +14 more
TL;DR: In this paper , a homeodomain leucine zipper (HD-ZIP) transcription factor named Woolly controls the fates of distinct trichomes in tomato via a dosage-dependent mechanism.
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A role for SPEECHLESS in the integration of leaf stomatal patterning with the growth vs disease trade-off in poplar
Athena D. McKown,Jaroslav Klápště,Jaroslav Klápště,Jaroslav Klápště,Robert D. Guy,Oliver Corea,Steffi Fritsche,Steffi Fritsche,Jürgen Ehlting,Yousry A. El-Kassaby,Shawn D. Mansfield +10 more
TL;DR: It is proposed that the occurrence of amphistomaty in P. trichocarpa involves PtSPCH1 and reflects selection for supporting rapid growth over investment in immunity, and shows co-ordinated expression during development.
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Stem development through vascular tissues: EPFL-ERECTA family signaling that bounces in and out of phloem.
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