کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2176712 1094569 2014 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Auxin-Callose-Mediated Plasmodesmal Gating Is Essential for Tropic Auxin Gradient Formation and Signaling
ترجمه فارسی عنوان
گرید پلاسمودیزمی متصل به اکسین-کولوز برای شکل گیری گرادیانت تروپیک اکسین و سیگنالینگ ضروری است
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیولوژی سلول
چکیده انگلیسی


• GSL8 controls plasmodesmata (PD) callose deposition, essential for tropic response
• GSL8 RNAi lines show increased PD permeability and auxin diffusion via PD
• Auxin-ARF7-callose-mediated PD gating is essential for tropic auxin response
• Auxin could regulate symplasmic delivery of a wide range of signaling agents

SummaryIn plants, auxin functions as a master controller of development, pattern formation, morphogenesis, and tropic responses. A sophisticated transport system has evolved to allow the establishment of precise spatiotemporal auxin gradients that regulate specific developmental programs. A critical unresolved question relates to how these gradients can be maintained in the presence of open plasmodesmata that allow for symplasmic exchange of essential nutrients and signaling macromolecules. Here we addressed this conundrum using genetic, physiological, and cell biological approaches and identified the operation of an auxin-GSL8 feedback circuit that regulates the level of plasmodesmal-localized callose in order to locally downregulate symplasmic permeability during hypocotyl tropic response. This system likely involves a plasmodesmal switch that would prevent the dissipation of a forming gradient by auxin diffusion through the symplasm. This regulatory system may represent a mechanism by which auxin could also regulate symplasmic delivery of a wide range of signaling agents.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: - Volume 28, Issue 2, 27 January 2014, Pages 132–146
نویسندگان
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