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The HB40-JUB1 transcriptional regulatory network controls gibberellin homeostasis in Arabidopsis

Molecular Plant 2022年第2期15卷 322-339页

作者： Shuchao Dong danuse tarkowska Mastoureh Sedaghatmehr Maryna Welsch Saurabh Gupta Bernd Mueller-Roeber Salma Balazadeh Max-Planck Institute of Molecular Plant Physiology Am Mühlenberg 114476 Potsdam-GolmGermany Institute of Biology Leiden UniversitySylviusweg 722333 BE LeidenThe Netherlands Laboratory of Growth Regulators Czech Academy of SciencesInstitute of Experimental Botany&Palacky UniversityŠlechtitelû2778371 OlomoucCzech Republic University of Potsdam Institute of Biochemistry and BiologyKarl-Liebknecht-Stra?e 24-25Haus 2014476 Potsdam-GolmGermany

The gibberellins(GAs)are phytohormones that play fundamental roles in almost every aspect of plant growth and development.Although GA biosynthetic and signaling pathways are well understood,the mechanisms that control GA homeostasis remain largely unclear in plants.Here,we demonstrate that the homeobox transcription factor(TF)HB40 of the HD-Zip family regulates GA content at two additive con-trol levels in Arabidopsis thaliana.We show that HB40 expression is induced by GA and in turn reduces the levels of endogenous bioactive GAs by simultaneously reducing GA biosynthesis and increasing GA deac-tivation.Consistently,HB40 overexpression leads to typical GA-deficiency traits,such as small rosettes,reduced plant height,delayed flowering,and male sterility.By contrast,a loss-of-function hb40 mutation enhances GA-controlled growth.Genome-wide RNA sequencing combined with molecular-genetic ana-lyses revealed that HB40 directly activates the transcription of JUNGBRUNNEN1(JJUB1),a key TF that re-presses growth by suppressing GA biosynthesis and signaling.HB40 also activates genes encoding GA 2-oxidases(GA2oxs),which are major GA-catabolic enzymes.The effect of HB40 on plant growth is ultimately mediated through the induction of nuclear growth-repressing DELLA proteins.Collectively,our results reveal the important role of the HB40-JUB1 regulatory network in controlling GA homeostasis during plant growth.

关键词： Arabidopsis growth gibberellin homeostasis transcription factor HB40 JUB1 GA 2-oxidase DELLA proteins

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Vacuole Integrity Maintained by DUF300 Proteins Is Required for Brassinosteroid Signaling Regulation

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Molecular Plant 2018年第4期11卷 553-567页

作者： Qinsong Liu Thomas Vain Corrado Viotti Siamsa M, Doyle danuse tarkowska Ondrej Novak Cyril Zipfel Folke Sitbon Stephanie Robert Daniel Hofius Department of Plant Biology Uppsala BioCenter Swedish University of Agricultural Sciences (SLU) and Linnean Center for Plant Biology PO Box 7080 750 07 Uppsala Sweden Department of Forest Genetics and Plant Physiology Umea Plant Science Centre Swedish University of Agricultural Sciences (SLU) 90183 Umea Sweden Umea Plant Science Centre Umea University 90187 Umea Sweden Institute of Biochemistry and Biology Plant Physiology University of Potsdam 14476 Potsdam Germany Laboratory of Growth Regulators Centre of the Region Hana for Biotechnological and Agricultural Research institute of Experimental Botany ASCR and Palacky University 783 71 Olomouc Czech Republic The Sainsbury Laboratory Norwich Research Park Norwich NR4 7UH UK These authors contributed equally to this article. Present addresses: Key Laboratory of Southwest China Wildlife Resources Conservation (Ministry of Education) College of Life Science China West Normal University Nanchong 637009 Sichuan China Institut de Biologie Moleculaire des Plantes du CNRS IBMP-CNRS UPR2357 12 rue du General Zimmer 67084 Strasbourg France

Brassinosteroid （BR） hormone signaling controls multiple processes during plant growth and development and is initiated at the plasma membrane through the receptor kinase BRASSINOSTEROID INSENSITIVE1 （BRI1） together with co-receptors such as BRI1-ASSOClATED RECEPTOR KINASE1 （BAK1）. BRI1 abun- dance is regulated by endosomal recycling and vacuolar targeting, but the role of vacuole-related proteins in BR receptor dynamics and BR responses remains elusive. Here, we show that the absence of two DUF300 domain-containing tonoplast proteins, LAZARUS1 （LAZl） and LAZl HOMOLOG1 （LAZlH1）, causes vacuole morphology defects, growth inhibition, and constitutive activation of BR signaling. Intriguingly, tonoplast accumulation of BAK1 was substantially increased and appeared causally linked to enhanced BRI1 trafficking and degradation in lazl lazlhl plants. Since unrelated vacuole mutants exhibited normal BR responses, our findings indicate that DUF300 proteins play distinct roles in the regulation of BR signaling by maintaining vacuole integrity required to balance subcellular BAK1 pools and BR receptor distribution.

关键词： brassinosteroid signaling vacuole integrity DUF300 proteins tonoplast Arabidopsis

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