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首页> 外文期刊>Journal of Experimental Botany >The AtMYB11 gene from Arabidopsis is expressed in meristematic cells and modulates growth in planta and organogenesis in vitro
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The AtMYB11 gene from Arabidopsis is expressed in meristematic cells and modulates growth in planta and organogenesis in vitro

机译：来自拟南芥的AtMYB11基因在分生组织细胞中表达，并在体外调节植物的生长和器官发生

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摘要

In plants, MYB transcription factors play important roles in many developmental processes including cell cycle progression, cell differentiation, and lateral organ polarity. It is shown here that the R2R3-MYB AtMYB11 gene is expressed in root and shoot meristems and also in young still meristematic leaf and flower primordia of Arabidopsis. Knock-out atmyb11-I mutants and RNAi plants germinate faster, show a faster hypocotyl and primary root elongation, develop more lateral and adventitious roots, show faster development of the inflorescence, and initiate more lateral inflorescences and fruits than wild-type plants. The opposite phenotype was displayed by plants overexpressing AtMYB11. De novo formation of root meristemoids and, consequently, macroscopic roots, from thin cell layers cultured in vitro was enhanced in explants from atmyb11-I and reduced in those from lines overexpressing AtMYB11. These findings indicate that AtMYB11 modulates overall growth in plants by reducing the proliferation activity of meristematic cells and delaying plant development.
机译：在植物中，MYB转录因子在许多发育过程中发挥重要作用，包括细胞周期进程，细胞分化和侧器官极性。此处显示了R2R3-MYB AtMYB11基因在拟南芥的根和芽分生组织中以及还在年轻的分生叶和花原基中表达。与野生型植物相比，敲除的atmyb11-I突变体和RNAi植物发芽更快，显示出较快的下胚轴和初生根伸长，发育出更多的侧生和不定根，显示出更快的花序，并启动了更多的侧生花序和果实。通过过量表达AtMYB11的植物表现出相反的表型。从atmyb11-I的外植体中增强了体外培养的薄细胞层从头形成的根分生组织以及因此形成的宏观根，而从过表达AtMYB11的系中则减少了它们的形成。这些发现表明AtMYB11通过降低分生组织细胞的增殖活性并延迟植物发育来调节植物的总体生长。

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