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Increased branching independent of strigolactone in cytokinin oxidase 2-overexpressing tomato is mediated by reduced auxin transport

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Molecular Horticulture 2022年第1期2卷 153-171页

作者： Lilian Ellen Pino Joni E.Lima Mateus H.Vicente Ariadne F.L.de Sá Francisco Pérez-Alfocea Alfonso Albacete Juliana L.Costa TomášWerner Thomas Schmülling Luciano Freschi Antonio Figueira Agustin Zsögön Lázaro E.P.Peres Laboratory of plant Breeding Centro de Energia Nuclear na AgriculturaUniversity of Sao PauloSão PauloBrazil Laboratory of Hormonal Control of plant development Department of Biological SciencesEscola Superior de Agricultura‘Luiz de Queiroz’University of Sao PauloPiracicabaBrazil Botany Department ICBFederal University of Minas GeraisBelo HorizonteBrazil Department of plant Nutrition CEBAS-CSICCampus Univ.EspinardoMurciaSpain Institute of Biology/Applied Genetics Freie Universität BerlinBerlinGermany Institute of Biology University of GrazSchubertstraße 518010 GrazAustria Biosciences Institute University of Sao PauloSão PauloBrazil plant Sciences Department Federal University of ViçosaViçosaBrazil

Tomato production is influenced by shoot branching,which is controlled by different *** we produced tomato plants overexpressing the cytokinin-deactivating gene CYTOKININ OXYDASE 2(CKX2).CKX2-overexpressing(CKX2-OE)plants showed an excessive growth of axillary shoots,the opposite phenotype expected for plants with reduced cytokinin content,as evidenced by LC-MS analysis and ARR5-GUS *** TCP transcription factor SlBRC1b was downregulated in the axillary buds of CKX2-OE and its excessive branching was dependent on a functional version of the GRAS-family gene LATERAL SUPPRESSOR(LS).Grafting experiments indicated that increased branching in CKX2-OE plants is unlikely to be mediated by root-derived *** CKX2-OE plants with transgenic antisense plants for the strigolactone biosynthesis gene CAROTENOID CLEAVAGE DIOXYGENASE(CCD7-AS)produced an additive phenotype,indicating independent effects of cytokinin and strigolactones on increased *** the other hand,CKX2-OE plants showed reduced polar auxin transport and their bud outgrowth was reduced when combined with auxin ***,CKX2-OE basal buds did not respond to auxin applied in the decapitated *** results suggest that tomato shoot branching depends on a fine-tuning of different hormonal balances and that perturbations in the auxin status could compensate for the reduced cytokinin levels in CKX2-OE plants.

关键词： CKX2 Hormones plant development Solanum

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Auxin biosynthesis by the YUCCA6 flavin monooxygenase gene in woodland strawberry

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Journal of Integrative plant Biology 2014年第4期56卷 350-363页

作者： Hong Liu Wei-Fa Xie Ling Zhang Victoriano Valpuesta Zheng-Wen Ye Qing-Hua Gao Ke Duan Forestry and Fruit Tree Research Institute Shanghai Key Laboratory of Protected Horticultural Technology Shanghai Academy of Agricultural Sciences (SAAS) Shanghai Key Laboratory of Agricultural Genetics and Breeding Institute of Biotechnology Department of Molecular Biology and Biochemistry Universidad de Málaga

Auxin has been regarded as the main signal molecule coordinating the growth and ripening of fruits in strawberry, the reference genomic system for Rosaceae. The mechanisms regulating auxin biosynthesis in strawberry are largely elusive. Recently, we demonstrated that two YUCCA genes are involved in flower and fruit development in cultivated strawberry. Here, we show that the woodland strawberry （Fragaria vesca L.） genome harbors nine loci for YUCCA genes and eight of them encode functional proteins. Transcription pattern in different plant organs was different for all eight FvYUCs. Functionality of the FvYUC6 gene was studied in transgenic strawberry over- expressing FvYUC6, which showed typical high-auxin pheno- types. Overexpression of FvYUC6 also delayed flowering and led to complete male sterility in F. vesta. Additionally, specific repression of FvYUC6 expression by RNA interference signifi- cantly inhibited vegetative growth and reduced plant fertility. The development of leaves, roots, flowers, and fruits was greatly affected in FvYUC6-repressed plants. Expression of a subset of auxin-responsive genes was well correlated with the changes of FvYUC6 transcript levels and free indole-3-acetic acid levels in transgenic strawberry. These observations are consistent with an important role of FvYUC6 in auxin synthesis, and support a main role of the gene product in vegetative and reproductive development in woodland strawberry.

关键词： Auxin biosynthesis Fragaria vesta plant development RNAinterference YUCCA genes

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A Pivotal Role of DELLAs in Regulating Multiple Hormone Signals

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Molecular plant 2016年第1期9卷 10-20页

作者： Jean-Michel Daviere Patrick Achard Institut de Biologie Moleculaire des plantes (IBMP) UPR2357 associe avec l'Universite de Strasbourg 12 rue General Zimmer 67084 Strasbourg Cedex France

plant phenotypic plasticity is controlled by diverse hormone pathways, which integrate and convey infor- mation from multiple developmental and environmental signals. Moreover, in plants many processes such as growth, development, and defense are regulated in similar ways by multiple hormones. Among them, gibberellins （GAs） are phytohormones with pleiotropic actions, regulating various growth processes throughout the plant life cycle. Previous work has revealed extensive interplay between GAs and other hor- mones, but the molecular mechanism became apparent only recently. Molecular and physiological studies have demonstrated that DELLA proteins, considered as master negative regulators of GA signaling, inte- grate multiple hormone signaling pathways through physical interactions with transcription factors or reg- ulatory proteins from different families. In this review, we summarize the latest progress in GA signaling and its direct crosstalk with the main phytohormone signaling, emphasizing the multifaceted role of DELLA proteins with key components of major hormone signaling pathways.

关键词： gibberellins DELLAs hormone crosstalk plant development phenotypic plasticity

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Transcriptional Repression by Histone Deacetylases in plants

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Molecular plant 2014年第5期7卷 764-772页

作者： Xuncheng Liua Songguang Yang Minglei Zhaoa Ming Luo Chun-Wei Yu Chia-Yang Chen Ready Tai Keqiang Wu Key Laboratory of plant Resources Conservation and Sustainable Utilization South China Botanical Garden Chinese Academy ofSciences Guangzhou 510650 China Institute of plant Biology National Taiwan University Taipei University of Chinese Academy of Sciences Beijing 100049 China

Reversible histone acetylation and deacetylation at the N-terminus of histone tails play crucial roles in regulation of eukaryotic gene activity. Acetylation of core histones usually induces an ＇open＇ chromatin structure and is associated with gene activation, whereas deacetylation of histone is often correlated with ＇closed＇ chromatin and gene repression. Histone deacetylation is catalyzed by histone deacetylases （HDACs）. A growing number of studies have demonstrated the importance of histone deacetylation/acetylation on genome stability, transcriptional regulation, and development in plants. Furthermore, HDACs were shown to interact with various chromatin remolding factors and transcription factors involved in transcriptional repression in multiple developmental processes. In this review, we summarized recent findings on the transcriptional repression mediated by HDACs in plants.

关键词： histone deacetylases transcriptional repression plant development abiotic and biotic stresses.

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plant E3 Ligases： Flexible Enzymes in a Sessile World

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Molecular plant 2013年第5期6卷 1388-1404页

作者： Liyuan Chen Hanjo Hellmann plant Stress Physiology School of Biological Sciences Abelson 435 PO Box 644236 Washington State University Pullman WA 99164-4236 USA

Since its discovery in the late 1970s, the ubiquitin proteasome pathway appears to be omnipresent in many research fields. Although originally discovered in animals, the pathway has a very central role in plants, which may be correlated to their sessile lifestyle. E3 ligases function as flexible and highly diverse key regulators within the path- way by targeting substrate proteins for ubiquitylation, and often proteolytic degradation via the 26S proteasome. This review provides a concise overview on the most common classes of E3 ligases so far described in plants, and emphasizes recent findings regarding these interesting and flexible enzymes and their diverse functions in plant biology.

关键词： E3 ligases plant development plant physiology ubiquitin proteasome pathway.

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Histone Deacetylase Genes in Arabidopsis development

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Journal of Integrative plant Biology 2008年第7期50卷 875-885页

作者： Courtney Hollende Department of Cell Biology and Molecular Genetics University of Maryland College ParkMaryland 20742USA

Histone acetylation and deacetylation are directly connected with transcriptional activation and silencing in eukaryotes. Gene families for enzymes that accomplish these histone modifications show surprising complexity in domain organization, tissue-specific expression, and function. This review is focused on the family of histone deacetylases （HDACs） that remove the acetyl group from core histone tails, resulting in a ＂closed＂ chromatin and transcriptional repression. In Arabidopsis, 18 HDAC genes are divided into three different types - RPD3-1ike, HD-tuin and sirtuin - with two or more members in each type. The structural feature of each HDAC class, the expression profile of each HDAC gene during development and functional insights of important family members are summarized here. It is clear that HDACs are an important class of global transcriptional regulators that play crucial roles in plant development, defense, and adaptation.

关键词： chromatin epigenetic regulation gene silencing histone deacetylase plant development

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Cloning and Characterization of Protein Prenyltransferase Alpha Subunit in Rice

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Rice science 2021年第6期28卷 557-566,I0037页

作者： WANG Tao LOU Lijuan LI Zeyu SHANG Lianguang WANG Quan Shenzhen Branch Guangdong Laboratory for Lingnan Modem Agriculture/Genome Analysis Laboratory of Ministry of Agriculture and Rural Affairs/Agricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen 518120China

Protein prenylation plays a crucial role in plant development and stress *** report the function of pren yltra nsferase a-sub unit in ***-protei n in teractions showed that the fam esyl-transferase(OsPFT)/geranylgeranyltransferase-l(OsPGGT l-a)protein interacted together with OsPFT-P and OsPGGT *** a-and p-subunits of OsPFT formed a heterodimer for the transfer of a farnesyl group from famesyl pyrophosphate to the CaaX-box-containing peptide ***,the tissue expressi on patter ns of the OsPFT and OsPGGT I sub units were similar,and these sub units were localized in the cytoplasm and ***,OsPFT/OsPGGT/-a-deletion homozygous rice mutants had a lethal phenotype,and the heterozygous mutants exhibited reduced pollen *** results indicated that prenylation plays an important role in rice development.

关键词： protein prenylation plant development rice pollen viability

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Single-cell profiling lights different cell trajectories in plants

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aBIOTECH 2021年第1期2卷 64-78页

作者： Hong-xiang Zheng Feng-hui Wu Si-min Li Xian Sheng Zhang Na Sui Shandong Provincial Key Laboratory of plant Stress College of Life SciencesShandong Normal UniversityJi’nan 250014ShandongChina State Key Laboratory of Crop Biology College of Life SciencesShandong Agricultural UniversityTai’an 271018ShandongChina

The molecular mechanism of the maintenance and differentiation of plant stem cells is an eternal theme in studies on plant growth and *** advances in single-cell RNA sequencing(scRNAseq)methods have completely changed the understanding of cell heterogeneity and cell function,allowing research precision to identify the differentiation trajectory of stem cells maintained and differentiated at the cellular *** review aimed to mainly discuss the novel insights provided by scRNA-seq for the maintenance and initiation of plant stem cells,cell differentiation,cell response to environmental changes,and improvement strategies for *** addition,it highlighted additional perspectives beyond scRNA-seq,such as spatial transcriptomes,epigenomes,and single-cell multiomics,for a renewed understanding of stem cell maintenance and cell differentiation,thus providing potential targets and theoretical foundations for crop improvement.

关键词： Epigenomes plant development plant stem cells Single-cell multi-omics Single-cell RNA sequencing

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Elaborating the Functional Roles of a Leucine-Rich Repeat Protein from Arabidopsis thaliana

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American Journal of plant Sciences 2022年第11期13卷 1381-1401页

作者： Angela Sibanda-Makuvise Tshegofatso B. Dikobe Katlego S. Sehlabane Enetia D. Bobo Neo M. Mametja Mutsa M. Takundwa David T. Kawadza Thembekile Ncube Oziniel Ruzvidzo Department of Botany North-West University Mmabatho South Africa Department of Applied Biology and Biochemistry National University of Science and Technology Bulawayo Zimbabwe

plants, just like any other living organism, naturally get attacked by various pathogenic microorganisms such as bacteria, fungi and viruses. However, unlike animals that utilize their specialized circulatory macrophage system to protect themselves, plants instead use a multi-layered complex system termed the plant innate immunity, which recognizes pathogens and transducing downstream defense responses. They have developed a unique type of trans-membrane receptors or R proteins, which extracellularly, are capable of recognizing pathogen-associated molecular patterns (PAMP) such as flagellin and chitin, while intracellularly, they activate their harbored nucleotide cyclases (NCs) such as adenylyl cyclases (ACs), to generate second messenger molecules such as 3’,5’-cyclic adenosine monophosphate (cAMP), which then propagates and magnifies the defense response. To date, only a single R protein from Arabidopsis thaliana (AtLRR) has been shown to possess AC activity as well as having the ability to defend plants against infection by biotrophic and hemi-biotrophic pathogens. Therefore, in order to further broaden information around the functional roles of this protein (AtLRR), we explored it further, using an array of web-based tools or bioinformatics. These included structural analysis, anatomical expression analysis, developmental expression analysis, co-expression analysis, functional enrichment analysis, stimulus-specific expression analysis and promoter analysis. Findings from structural analysis showed that AtLRR is a multi-domain, trans-membrane molecule that is multi-functional, and thus consistent with all known R-proteins. Findings from anatomical and developmental expression analyses showed that AtLRR is mostly expressed in pollen grains and flowers, senescing leaves as well as during the development of seeds, shoots, roots, seedlings, leaves, flowers, and siliques, linking it to the three key plant physiological processes of reproduction, defense and developme

关键词： Disease Resistance Adenylyl Cyclase R-Proteins AtLRR plant development plant Reproduction

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Regulation of Shoot and Root development through Mutual Signaling

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Molecular plant 2012年第5期5卷 974-983页

作者： Jerome Puig Germain Pauluzzi Emmanuel Guiderdoni Pascal Gantet Universite Montpellier 2 UMR DAP Bat 15 CC 002 Place Eugene Bataillon 34095 Montpellier Cedex 5 France CIRAD UMR DAP Avenue Agropolis TA A-96/03 34398 Montpellier Cedex 5 France University of Science and Technology of Hanoi LMI RICE Agricultural Genetics Institute Ha Noi Viet Nam IRD UMR DIADE Avenue Agropolis 34398 Montpellier Cedex 5 France

plants adjust their development in relation to the availability of nutrient sources. This necessitates signal- ing between root and shoot. Aside from the well-known systemic signaling processes mediated by auxin, cytokinin, and sugars, new pathways involving carotenoid-derived hormones have recently been identified. The auxin-responsive MAX pathway controls shoot branching through the biosynthesis of strigolactone in the roots. The BYPASSI gene affects the production of an as-yet unknown carotenoid-derived substance in roots that promotes shoot development. Novel local and systemic mechanisms that control adaptive root development in response to nitrogen and phosphorus starvation were recently discovered. Notably, the ability of the NITRATE TRANSPORTER 1.1 to transport auxin drew for the first time a functional link between auxin, root development, and nitrate availability in soil. The study of plant response to phos- phorus starvation allowed the identification of a systemic mobile miRNA. Deciphering and integrating these signaling pathways at the whole-plant level provide a new perspective for understanding how plants regulate their development in response to environmental cues.

关键词： plant development systemic signaling strigolactone BYPASS1 nitrate phosphate miRNA.

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