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Growth asymmetry precedes differential auxin response during apical hook initiation in Arabidopsis

Journal of Integrative Plant Biology 2022年第1期64卷 5-22页

作者： Yang Peng Dan Zhang Yuping Qiu Zhina Xiao Yusi Ji Wenyang Li Yiji Xia Yichuan Wang Hongwei Guo Department of Biology Institute of Plant and Food ScienceSchool of Life SciencesSouthern University of Science and TechnologyShenzhen 518055China Department of Biology Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education InstitutesSchool of Life SciencesSouthern University of Science and TechnologyShenzhen 518055China Department of Biology Faculty of ScienceHong Kong Baptist UniversityKowloon TongHong Kong 999077China Microlens Technologies Beijing 100086China

The development of a hook-like structure at the apical part of the soil-emerging organs has fascinated botanists for centuries,but how it is initiated remains ***,we demonstrate with highthroughput infrared imaging and 2-D clinostat treatment that,when gravity-induced root bending is absent,apical hook formation still takes *** such scenarios,hook formation begins with a de novo growth asymmetry at the apical part of a straightly elongating ***,suchde novo asymmetric growth,but not the following hook enlargement,precedes the establishment of a detectable auxin response asymmetry,and is largely independent of auxin biosynthesis,transport and ***,we found that functional cortical microtubule array is essential for the following enlargement of hook *** microtubule array was disrupted by oryzalin,the polar localization of PIN proteins and the formation of an auxin maximum became impaired at the to-be-hook *** together,we propose a more comprehensive model for apical hook initiation,in which the microtubuledependent polar localization of PINs may mediate the instruction of growth asymmetry that is either stochastically taking place,induced by gravitropic response,or both,to generate a significant auxin gradient that drives the full development of the apical hook.

关键词： apical hook initiation asymmetric auxin response cortical microtubule array de novo growth asymmetry PINs

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