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Endogenous Hypoxia in Lateral Root Primordia Controls Root Architecture by Antagonizing Auxin Signaling in Arabidopsis

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Molecular Plant 2019年第4期12卷 538-551页

作者： Vinay Shukla Lara Lombardi Sergio lacopino ales pencik Ondrej Novak Pierdomenico Perata Beatrice Giuntoli Francesco Licausi Unstitute of Life Sciences Scuola Superiore Sant'Anna Pisa Italy Biology Department University of Pisa Pisa Italy Laboratory of Growth Regulators Centre of the Region Hana for Biotechnological and Agricultural Research Institute of Experimental Botany CAS & Faculty of Science. Palacky University Slechtitelu 27 78371 Olomouc Czech Republic

As non-photosynthesizing organs, roots are dependent on diffusion of oxygen from the external environment and, in some in stances, from the shoot for their aerobic metabolism . Establishment of hypoxic niches in the developing tissues of plants has been postulated as a consequence of insufficient diffusion of oxygen to satisfy the demands throughout development. Here, we report that such niches are established at specific stages of lateral root primordia development in Arabidopsis thaliana grown under aerobic conditions. Using gain- and loss-of-function mutants, we show that ERF-Ⅶ transcription factors, which mediate hypoxic responses, control root architecture by acting in cells with a high level of auxin signaling. ERF-Ⅶs repress the expression of the auxin-induced genes LBD16, LBD18, and PUCHI, which are essential for lateral root development, by binding to their promoters. Our results support a model in which the establishment of hypoxic n iches in the developing lateral root primordia con tributes to the shutting down of key auxin-induced genes and regulates the production of lateral roots.

关键词： Arabidopsis auxin ERF-VII, hypoxia lateral root root development

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Conserved Cytochrome P450 Evolved in Seed Plants Regulates Flower Maturation

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Molecular Plant 2015年第12期8卷 1751-1765页

作者： Zhenhua Liu Benoit Boachon RaphaelLugan Raquel Tavares Mathieu Erhardt Jerome Mutterer Valerie Demais Stephanie Pateyron Veronique Brunaud Toshiyuki Ohnishi ales pencik Patrick Achard Fan Gong Peter Hedden Daniele Werck-Reichhart Hugues Renault Institute of Plant Molecular Biology Centre National de la Recherche Scientifique (CNRS) University of Strasbourg 67084 Strasbourg France Laboratoire de Biometrie et Biologie Evolutive Universite Lyon 1 CNRS 69622 Villeurbanne France plateforme d'lmagerie In Vitro IFR 37 de Neurosciences 67084 Strasbourg France Transcriptomic Platform Unite de Recherche en Genomique Vegetale (URGV) INRA Universite d'Evry Val d'Essonne CNRS 91057 Evry France Bioinformatics for Predictive Genomics URGV INRA Universite d'Evry Val d'Essonne CNRS 91057 Evry France Graduate School of Agriculture Shizuoka University Shizuoka 422-8529 Japan Laboratory of Growth Regulators & Department of Chemical Biology and Genetics Centre of the Region Hana for Biotechnological and Agricultural Research Faculty of Science Palacky University & Institute of Experimental Botany AS CR 771 47 Olomouc Czech Republic Rothamsted Research Harpenden Hertfordshire AL5 2JQ UK University of Strasbourg Institute for Advanced Study (USIAS) 67084 Strasbourg France Freiburg institute for Advanced Studies (FRIAS) University of Freiburg 79104 Freiburg Germany Present address: 158 Emerson Hall Section of Plant Biology School of Integrative Plant Science Cornell University Ithaca NY 14853 USA present address: Laboratoire Physiologie des Fruits et Legumes - EA 4279 Campus Agroparc Avignon France present address: Home Office Science - Centre for Applied Science and Technology Woodcock Hill Sandridge St Albans HeFts AL4 9HQ UK

Global inspection of plant genomes identifies genes maintained in low copies across taxa and under strong purifying selection, which are likely to have essential functions. Based on this rationale, we investigated the function of the low-duplicated CYP715 cytochrome P450 gene family that appeared early in seed plants and evolved under strong negative selection. Arabidopsis CYP715A 1 showed a restricted tissue-specific expres- sion in the tapetum of flower buds and in the anther filaments upon anthesis, cyp715a1 insertion lines showed a strong defect in petal development, and transient alteration of pollen intine deposition. Comparative expres- sion analysis revealed the downregulated expression of genes involved in pollen development, cell wall biogenesis, hormone homeostasis, and floral sesquiterpene biosynthesis, especially TPS21 and several key genes regulating floral development such as MYB21, MYB24, and MYC2. Accordingly, floral sesquiterpene emission was suppressed in the cyp715a1 mutants. Flower hormone profiling, in addition, indicated a modi- fication of gibberellin homeostasis and a strong disturbance of the turnover of jasmonic acid derivatives. Petal growth was partially restored by the active gibberellin GA3 or the functional analog of jasmonoyl-isoleucine, coronatine. CYP715 appears to function as a key regulator of flower maturation, synchronizing petal expan- sion and volatile emission. It is thus expected to be an important determinant of flower-insect interaction.

关键词： flower development phylogenomics negative selection jasmonate gibberellins volatile compounds

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Design Details of Low-Energy and Passive Houses Using Composites from Waste Raw Materials

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Journal of Civil Engineering and Architecture 2011年第5期5卷 440-453页

作者： Libor Matejka Jan pencik Institute of Civil Buildings Faculty of Civil Engineering Brno University of Technology 602 O0 Brno Czech Republic Institute of Structural Mechanics Faculty of Civil Engineering Brno University of Technology 60200 Brno Czech Republic

The article deals with potential use of waste materials in construction industry, specifically use of high density polyethylene （HDPE）. The article is focused in particular on recycled polyethylene application in products designed for construction industry, especially for passive houses. Currently certain building details of passive houses are not perfect or their solution results in higher economic demands related to house purchase and its further use. For the purpose of this thesis details of windows installation in external walls and elimination of thermal bridges in wall footing have been chosen. Products were subject to mathematic modelling of thermal technique and statics. The executed mathematic models documented that products are fully functional and that the suggested product successfully eliminate insufficiencies of some currently applied solutions.

关键词： Recycling of materials energy savings ecology waste polymer composite thermal bridges.

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