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The Arabidopsis DSO/ABCG 11 Transporter Affects Cutin Metabolism in Reproductive Organs and Suberin in Roots

Molecular Plant 2010年第3期3卷 563-575页

作者： David Panikashvili Jian Xin Shi Samuel Bocobza Rochus Benni Franke lukas schreiber Asaph Aharoni Department of Plant Sciences Weizrnann Institute of Science PO Box 26 Rehovot 76100 Israel Institute of Cellular and Molecular Botany (IZMB) Department of Ecophysiology Kirschallee 1 University of Bonn D-53115 Bonn Germany

Apart from its significance in the protection against stress conditions, the cuticular cover is essential for proper development of the diverse surface structures formed on aerial plant organs. This layer mainly consists of a cutin matrix, embedded and overlaid with cuticular waxes, Following their biosynthesis in epidermal cells, cutin and waxes were suggested to be exported across the plasma membrane by ABCG-type transporters such as DSO/ABCG11 to the cell wall and further to extracellular matrix. Here, additional aspects of DSO/ABCG11 function were investigated, predomi- nantly in reproductive organs, which were not revealed in the previous reports. This was facilitated by the generation of a transgenic DSO/ABCG11 silenced line （dso-4） that displayed relatively subtle morphological and chemical phenotypes. These included altered petal and silique morphology, fusion of seeds, and changes in levels of cutin monomers in flowers and siliques. The dso-4 phenotypes corresponded to the strong DSO/ABCG11 gene expression in the embryo epidermis as well as in the endosperm tissues of the developing seeds. Moreover, the DSO/ABCG11 protein displayed polar localization in the embryo protoderm. Transcriptome analysis of the dso-4 mutant leaves and stems showed that reduced DSO/ABCG11 activity suppressed the expression of a large number of cuticle-associated genes, implying that export of cuticular lipids from the plasma membrane is a rate-limiting step in cuticle metabolism. Surprisingly, root suberin composition of dso-4 was altered, as well as root expression of two suberin biosynthetic genes. Taken together, this study provides new insights into cutin and suberin metabolism and their role in reproductive organs and roots development.

关键词： Arabidopsis transporters flower cutin waxes suberin.

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Apoplastic barriers of Populus×canescens roots in reaction to different cultivation conditions and abiotic stress treatments

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Stress Biology 2023年第1期3卷 269-282页

作者： Paul Grunhofer Ines Heimerich Lena Herzig Svenja Pohl lukas schreiber Department of Ecophysiology Institute of Cellular and Molecular BotanyUniversity of BonnKirschallee 153115 BonnGermany

Populus is an important tree genus frequently cultivated for economical ***,the high sensitivity of poplars towards water deficit,drought,and salt accumulation significantly affects plant productivity and limits biomass *** cultivation and abiotic stress conditions have been described to significantly induce the formation of apoplastic barriers(Casparian bands and suberin lamellae)in roots of different monocotyledonous crop ***,this study aimed to investigate to which degree the roots of the dicotyledonous gray poplar(Populus×canescens)react to a set of selected cultivation conditions(hydroponics,aeroponics,or soil)and abiotic stress treatments(abscisic acid,oxygen deficiency)because a differing stress response could potentially help in explaining the observed higher stress *** apoplastic barriers of poplar roots cultivated in different environments were analyzed by means of histochemistry and gas chromatography and compared to the available literature on monocotyledonous crop ***,dicotyledonous poplar roots showed only a remarkably low induction or enhancement of apoplastic barriers in response to the different cultivation conditions and abiotic stress *** genetic optimization(e.g.,overexpression of biosynthesis key genes)of the apoplastic barrier development in poplar roots might result in more stress-tolerant cultivars in the future.

关键词： Hydroponics Aeroponics Soil Abscisic acid(ABA) Oxygen deficiency Poplar root suberin

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Transcriptomic and epigenomic remodeling occurs during vascular cambium periodicity in Populus tomentosa

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Horticulture Research 2021年第1期8卷 1271-1286页

作者： Bo Chen Huimin Xu Yayu Guo Paul Grunhofer lukas schreiber Jinxing Lin Ruili Li Beijing Advanced Innovation Center for Tree Breeding by Molecular Design Beijing Forestry UniversityBeijing 100083China College of Biological Sciences and Biotechnology Beijing Forestry UniversityBeijing 100083China Institute of Tree Development and Genome Editing Beijing Forestry UniversityBeijing 100083China College of Biological Sciences China Agricultural UniversityBeijing 100193China Institute of Cellular and Molecular Botany University of BonnKirschallee 1D-53115 BonnGermany

Trees in temperate regions exhibit evident seasonal patterns,which play vital roles in their growth and *** activity of cambial stem cells is the basis for regulating the quantity and quality of wood,which has received considerable ***,the underlying mechanisms of these processes have not been fully *** we performed a comprehensive analysis of morphological observations,transcriptome profiles,the DNA methylome,and miRNAs of the cambium in Populus tomentosa during the transition from dormancy to *** analysis showed that the active cambial zone exhibited a significant increase in the width and number of cell layers compared with those of the dormant and reactivating ***,we found that differentially expressed genes associated with vascular development were mainly involved in plant hormone signal transduction,cell division and expansion,and cell wall *** addition,we identified 235 known miRNAs and 125 novel *** expressed miRNAs and target genes showed stronger negative correlations than other miRNA/target ***,global methylation and transcription analysis revealed that CG gene body methylation was positively correlated with gene expression,whereas CHG exhibited the opposite trend in the downstream *** importantly,we observed that the number of CHH differentially methylated region(DMR)changes was the greatest during cambium ***,the genes with hypomethylated CHH DMRs in the promoter were involved in plant hormone signal transduction,phenylpropanoid biosynthesis,and plant–pathogen interactions during vascular cambium *** findings improve our systems-level understanding of the epigenomic diversity that exists in the annual growth cycle of trees.

关键词： periodicity finding during

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A CYP450X Catalyzing the ω-Hydroxylation of Fatty Acids is Required for Anther Cutin Biosynthesis and Pollen Exine Formation in Rice

A CYP450X Catalyzing the ω-Hydroxylation of Fatty Acids is ...

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中国植物生理学会第十次会员代表大会暨全国学术年会

作者： Vincent Sauveplane Franck Pinot Danièle Werck-Reichhart Patrik Diehl lukas schreiber Rochus Franke Institut de Biologie Moléculaire des Plantes CNRS UPR2357-Université de Strasbourg67083 Strasbourg Cedex France Institute of Cellular and Molecular Botany University of Bonn D-53115 Bonn Germany

＜正＞The anther cuticle and microspore exine act as protective barriers for male gametophyte and pollen grain, but relatively little is known about the mechanism underlying the biosynthesis of their monomers. We report

关键词： CYP450 fatty acid hydroxylase pollen exine cutin synthesis anther rice

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DEGENERATED PANICLE AND PARTIAL STERILITY 1(DPS1) encodes a CBS domain containing protein required for anther cuticle and panicle development in rice

DEGENERATED PANICLE AND PARTIAL STERILITY 1(DPS1) encodes a ...

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中国生物工程学会第十三届学术年会暨2019年全国生物技术大会

作者： Syed Adeel Zafar Suyash B.Patil Muhammad Uzair Jingjing Fang Jinfeng Zhao Tingting Guo Shoujiang Yuan Muhammad Uzair Qian Luo Jianxin Shi lukas schreiber Xueyong Li National Key Facility for Crop Gene Resources and Genetic Improvement Institute of Crop Science Chinese Academy of Agricultural Sciences Shandong RiceResearch Institute Joint International Research Laboratory of Metabolic and Developmental Sciences School of Life Sciences and Biotechnology Shanghai Jiao TongUniversity Institute of Cellular and Molecular Botany University of Bonn

Degeneration of apical spikelets and reduced panicle fertility are common reasons for low seed-setting rate in rice. However, little is known about the underlying molecular *** we report a novel degenerated panicle and partial sterility 1(dps1) mutant that showed panicle apical degeneration and reduced fertility in middle spikelets. dps1 plants were characterized by small whitish anthers with altered cuticle morphology and absence of pollen grains. Amounts of cuticular wax and cutin were significantly reduced in dps1 anthers. Panicles of dps1 plants showed an accumulation of reactive oxygen species(ROS), lower antioxidant activity and increased programmed cell death. Map-based cloning revealed that DPS1 encodes a mitochondrial-localized protein containing a cystathionine β-synthase(CBS) domain which showed the highest expression in panicles and anthers. DPS1 physically interacted with mitochondrial thioredoxin proteins Trx1 and Trx20 and it participated in ROS scavenging. Global gene expression analysis in dps1 revealed that biological processes related to fatty acid metabolism and ROS homeostasis were significantly affected and the expression of key genes involved in wax and cutin biosynthesis were *** results suggest that DPS1 plays a vital role in regulating ROS homeostasis, anther cuticle formation and panicle development in rice.

关键词： anther cuticle CBS domain Oryza sativa panicle apical degeneration reactive oxygen species seed setting rate

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COVID-19:Masks do not influence neurocognitive performance during a shift at the emergency department

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World Journal of Emergency Medicine 2023年第4期14卷 317-321页

作者： Jürgen Grafeneder Verena Fuhrmann Katharina Tscherny Maximilian Niederer Wolfgang schreiber Harald Herkner Dominik Roth Calvin lukas Kienbacher Department of Emergency Medicine Medical University of ViennaWien 1090Austria Department of Anaesthesiology and Intensive Care Hospital ScheibbsScheibbs 3270Austria

The COVID-19 pandemic has led to the widespread mandatory use of personal protective equipment(PPE),including filtering face pieces(FFP).Emergency medical care providers now commonly use this equipment.

关键词： COV Mask protective

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