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Table of Contents

The Plant Cell Online: 22 (7)
Jul 2010

IN BRIEF

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    YABBY Genes and the Development and Origin of Seed Plant Leaves
    Nancy A. Eckardt
    Plant Cell Jul 2010, 22 (7) 2103; DOI: https://doi.org/10.1105/tpc.110.220710
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    The Podostemad Puzzle: The Evolution of Unusual Morphology in the Podostemaceae
    Nancy A. Eckardt, David Baum
    Plant Cell Jul 2010, 22 (7) 2104; DOI: https://doi.org/10.1105/tpc.110.220711

PERSPECTIVE

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    Heterosis
    James A. Birchler, Hong Yao, Sivanandan Chudalayandi, Daniel Vaiman, Reiner A. Veitia
    Plant Cell Jul 2010, 22 (7) 2105-2112; DOI: https://doi.org/10.1105/tpc.110.076133

RESEARCH ARTICLES

  • Open Access
    Differentiating Arabidopsis Shoots from Leaves by Combined YABBY Activities
    Rajani Sarojam, Pia G. Sappl, Alexander Goldshmidt, Idan Efroni, Sandra K. Floyd, Yuval Eshed, John L. Bowman
    Plant Cell Jul 2010, 22 (7) 2113-2130; DOI: https://doi.org/10.1105/tpc.110.075853

    YABBY activity is required in seed plants for specification of leaves and the origin of the YABBY genes coincides with the origin of seed plant leaves. This work probes the role of YABBY genes in molding shoot programs into laminar organs by examining shoot and leaf development in plants mutant for four vegetative YABBY genes.

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    Expression of SHOOT MERISTEMLESS, WUSCHEL, and ASYMMETRIC LEAVES1 Homologs in the Shoots of Podostemaceae: Implications for the Evolution of Novel Shoot Organogenesis
    Natsu Katayama, Satoshi Koi, Masahiro Kato
    Plant Cell Jul 2010, 22 (7) 2131-2140; DOI: https://doi.org/10.1105/tpc.109.073189

    This work explores how organogenesis of the shoot apical meristem (SAM)-less shoots evolved from that of the typical SAM-mediated shoots in the aquatic eudicot Podostemaceae. Based on the expression patterns of STM, WUS, and ARP orthologs, the leaf in SAM-less shoot species is initiated as a SAM and differentiates into a single apical leaf, resulting in the evolution of novel shoot-leaf mixed organs in Podostemaceae.

  • Open Access
    Genetic Framework for Flattened Leaf Blade Formation in Unifacial Leaves of Juncus prismatocarpus
    Takahiro Yamaguchi, Satoshi Yano, Hirokazu Tsukaya
    Plant Cell Jul 2010, 22 (7) 2141-2155; DOI: https://doi.org/10.1105/tpc.110.076927

    Leaf blades of unifacial leaves, such as those of iris, have only the abaxial identity and become flattened by a mechanism different from that in bifacial leaves. This work shows that the unifacial leaf blade is abaxialized at the gene expression level and identifies the DROOPING LEAF gene ortholog as a candidate responsible for flattened leaf blade formation in unifacial leaves.

  • Open Access
    Orchestration of the Floral Transition and Floral Development in Arabidopsis by the Bifunctional Transcription Factor APETALA2
    Levi Yant, Johannes Mathieu, Thanh Theresa Dinh, Felix Ott, Christa Lanz, Heike Wollmann, Xuemei Chen, Markus Schmid
    Plant Cell Jul 2010, 22 (7) 2156-2170; DOI: https://doi.org/10.1105/tpc.110.075606

    This study examines how the transcription factor APETALA2 suppresses flowering by mapping direct targets of AP2 on a genome-wide scale and comparing the map to changes in gene expression. The results indicate an unexpected level of complexity in the interactions of transcription factors with one another and their targets.

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    Environmental Regulation of Lateral Root Emergence in Medicago truncatula Requires the HD-Zip I Transcription Factor HB1
    Federico Ariel, Anouck Diet, Marion Verdenaud, Véronique Gruber, Florian Frugier, Raquel Chan, Martin Crespi
    Plant Cell Jul 2010, 22 (7) 2171-2183; DOI: https://doi.org/10.1105/tpc.110.074823

    Medicago truncatula HB1 is an HD-Zip transcription factor involved in the adaptive developmental response of root architecture to adverse environmental stresses. HB1 reduces lateral root emergence, likely by directly repressing the expression of an auxin-responsive transcription factor from the LBD family, LBD1.

  • Open Access
    Natural Variation of Transcriptional Auxin Response Networks in Arabidopsis thaliana
    Carolin Delker, Yvonne Pöschl, Anja Raschke, Kristian Ullrich, Stefan Ettingshausen, Valeska Hauptmann, Ivo Grosse, Marcel Quint
    Plant Cell Jul 2010, 22 (7) 2184-2200; DOI: https://doi.org/10.1105/tpc.110.073957

    In this study, physiological, comparative transcriptomic, and network analysis approaches identify extensive natural variation of auxin responses among A. thaliana accessions. Expression level variation in auxin signaling genes is hypothesized to contribute to downstream variation in large auxin-regulated gene clusters.

  • Open Access
    Evidence for Light Wavelength-Specific Photoelectrophysiological Signaling and Memory of Excess Light Episodes in Arabidopsis
    Magdalena Szechyńska-Hebda, Jerzy Kruk, Magdalena Górecka, Barbara Karpińska, Stanisław Karpiński
    Plant Cell Jul 2010, 22 (7) 2201-2218; DOI: https://doi.org/10.1105/tpc.109.069302

    This work examines light wavelength–specific electrophysiological signaling and cellular light memory in Arabidopsis. Animals have their network of neurons, synapses, electrophysiological circuits and memory, but plants have their network of chloroplasts (connected by stromules), photoelectrophysiological signals transduced by bundle sheath cells, and cellular light memory.

  • Open Access
    The bHLH Transcription Factor POPEYE Regulates Response to Iron Deficiency in Arabidopsis Roots
    Terri A. Long, Hironaka Tsukagoshi, Wolfgang Busch, Brett Lahner, David E. Salt, Philip N. Benfey
    Plant Cell Jul 2010, 22 (7) 2219-2236; DOI: https://doi.org/10.1105/tpc.110.074096

    Iron deficiency induces a range of physiological responses that are controlled by transcriptional alterations concentrated in the root pericycle. The transcriptional regulator POPEYE regulates many of these responses possibly through interaction with iron deficiency response protein ILR3 and the putative E3 ligase protein BRUTUS.

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    Arabidopsis PCR2 Is a Zinc Exporter Involved in Both Zinc Extrusion and Long-Distance Zinc Transport
    Won-Yong Song, Kwan Sam Choi, Do Young Kim, Markus Geisler, Jiyoung Park, Vincent Vincenzetti, Maja Schellenberg, Sun Ha Kim, Yong Pyo Lim, Eun Woon Noh, Youngsook Lee, Enrico Martinoia
    Plant Cell Jul 2010, 22 (7) 2237-2252; DOI: https://doi.org/10.1105/tpc.109.070185

    This work shows that PCR2 is a membrane protein implicated in two processes, namely, the detoxification of zinc in the presence of high concentrations of zinc and the transfer of zinc from the root to the shoot. This dual role is likely made possible by PCR2’s expression pattern that differs in different parts of the root.

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    Crossovers Get a Boost in Brassica Allotriploid and Allotetraploid Hybrids
    Martine Leflon, Laurie Grandont, Frédérique Eber, Virginie Huteau, Olivier Coriton, Liudmila Chelysheva, Eric Jenczewski, Anne-Marie Chèvre
    Plant Cell Jul 2010, 22 (7) 2253-2264; DOI: https://doi.org/10.1105/tpc.110.075986

    There is a great demand to increase meiotic crossovers frequency in order to boost genetic diversity in traditional breeding and genetic studies. This work shows that this can be achieved by manipulating karyotype composition (diploid vs. allotriploid vs. allotetraploid) of plant hybrids.

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    Repeated Polyploidy Drove Different Levels of Crossover Suppression between Homoeologous Chromosomes in Brassica napus Allohaploids
    Marta Cifuentes, Frédérique Eber, Marie-Odile Lucas, Maryse Lode, Anne-Marie Chèvre, Eric Jenczewski
    Plant Cell Jul 2010, 22 (7) 2265-2276; DOI: https://doi.org/10.1105/tpc.109.072991

    This work examines the diversity of meiotic behavior in Brassica napus allohaploids and shows that it is related to the multiple origins of this species. The results also reflect the prevalence of a major locus determining different levels of crossover suppression at the species level.

  • Open Access
    Fast Diploidization in Close Mesopolyploid Relatives of Arabidopsis
    Terezie Mandáková, Simon Joly, Martin Krzywinski, Klaus Mummenhoff, Martin A. Lysak
    Plant Cell Jul 2010, 22 (7) 2277-2290; DOI: https://doi.org/10.1105/tpc.110.074526

    The genome evolution of land plants is characterized by multiple waves of whole-genome duplications (WGDs). This cytogenetic and molecular phylogenetic analysis revealed an unexpected WGD event in the ancestry of Australian crucifer species with diploid-like chromosome complements.

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    The CURLY LEAF Interacting Protein BLISTER Controls Expression of Polycomb-Group Target Genes and Cellular Differentiation of Arabidopsis thaliana
    Nicole Schatlowski, Yvonne Stahl, Mareike L. Hohenstatt, Justin Goodrich, Daniel Schubert
    Plant Cell Jul 2010, 22 (7) 2291-2305; DOI: https://doi.org/10.1105/tpc.109.073403

    Pc-G proteins are key regulators of plant cell fate and development. This study examines the Pc-G interacting protein BLISTER, which has Pc-G related and unrelated functions and might link Pc-G proteins to specific developmental processes.

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    Regulation of Cell Proliferation in the Stomatal Lineage by the Arabidopsis MYB FOUR LIPS via Direct Targeting of Core Cell Cycle Genes
    Zidian Xie, EunKyoung Lee, Jessica R. Lucas, Kengo Morohashi, Dongmei Li, James A.H. Murray, Fred D. Sack, Erich Grotewold
    Plant Cell Jul 2010, 22 (7) 2306-2321; DOI: https://doi.org/10.1105/tpc.110.074609

    The MYB protein FOUR LIPS (FLP) promotes Arabidopsis stomatal patterning by suppressing cell division before differentiation. FLP direct targets were found to be enriched in cell cycle genes that function in both S-G1 and G2-M phase, indicating that this transcription factor acts as a developmental integrator.

  • Open Access
    Temporal Control of Trichome Distribution by MicroRNA156-Targeted SPL Genes in Arabidopsis thaliana
    Nan Yu, Wen-Juan Cai, Shucai Wang, Chun-Min Shan, Ling-Jian Wang, Xiao-Ya Chen
    Plant Cell Jul 2010, 22 (7) 2322-2335; DOI: https://doi.org/10.1105/tpc.109.072579

    The microRNA156-targeted SQUAMOSA PROMOTER BINDING PROTEIN LIKE genes, which were reported to define an endogenous phase transition pathway, temporally control the trichome distribution on the stem and inflorescences by activating the trichome negative regulator genes TRICHOMELESS1 and TRIPTYCHON.

  • Open Access
    DNA Replication Factor C1 Mediates Genomic Stability and Transcriptional Gene Silencing in Arabidopsis
    Qian Liu, Junguo Wang, Daisuke Miki, Ran Xia, Wenxiang Yu, Junna He, Zhimin Zheng, Jian-Kang Zhu, Zhizhong Gong
    Plant Cell Jul 2010, 22 (7) 2336-2352; DOI: https://doi.org/10.1105/tpc.110.076349

    This work describes the identification of DNA replication factor C1 in regulating genomic integrity and transcriptional gene silencing in Arabidopsis. It provides further evidence supporting the importance of core DNA replication proteins in mediating genome stability, telomere maintenance, epigenetic regulation, DNA repair, and replication.

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    Arabidopsis Cockayne Syndrome A-Like Proteins 1A and 1B Form a Complex with CULLIN4 and Damage DNA Binding Protein 1A and Regulate the Response to UV Irradiation
    Caiguo Zhang, Huiping Guo, Jun Zhang, Guangqin Guo, Karen S. Schumaker, Yan Guo
    Plant Cell Jul 2010, 22 (7) 2353-2369; DOI: https://doi.org/10.1105/tpc.110.073973

    This study shows that Arabidopsis CSAat1A, which encodes a Cockayne Syndrome A-like protein, and its homolog, CSAat1B, form a heterotetramer in response to DNA damage and thereby play a key role in the plant’s response to UV-B irradiation.

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    Arabidopsis PHYTOCHROME INTERACTING FACTOR Proteins Promote Phytochrome B Polyubiquitination by COP1 E3 Ligase in the Nucleus
    In-Cheol Jang, Rossana Henriques, Hak Soo Seo, Akira Nagatani, Nam-Hai Chua
    Plant Cell Jul 2010, 22 (7) 2370-2383; DOI: https://doi.org/10.1105/tpc.109.072520

    This work identifies COP1 as the ubiquitin E3 ligase for not only phytochrome B but also other members of the stable phytochrome family and shows that PIF transcription factors enhance phyB ubiquitination by COP1 in vitro. It provides a molecular mechanism for the termination of red light signal transduction.

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    Ethylene-Induced Stabilization of ETHYLENE INSENSITIVE3 and EIN3-LIKE1 Is Mediated by Proteasomal Degradation of EIN3 Binding F-Box 1 and 2 That Requires EIN2 in Arabidopsis
    Fengying An, Qiong Zhao, Yusi Ji, Wenyang Li, Zhiqiang Jiang, Xiangchun Yu, Chen Zhang, Ying Han, Wenrong He, Yidong Liu, Shuqun Zhang, Joseph R. Ecker, Hongwei Guo
    Plant Cell Jul 2010, 22 (7) 2384-2401; DOI: https://doi.org/10.1105/tpc.110.076588

    The recently controversial ethylene signaling pathway has been reexamined in this study with results supporting a linear signaling pathway, in which EIN2 and EBF1/EBF2, but not MAP KINASE KINASE9, are essential signaling components required for ethylene-induced EIN3 and EIL1 protein stabilization.

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    The Levels of Male Gametic Mitochondrial DNA Are Highly Regulated in Angiosperms with Regard to Mitochondrial Inheritance
    Dan-Yang Wang, Quan Zhang, Yang Liu, Zhi-Fu Lin, Shao-Xiang Zhang, Meng-Xiang Sun, Sodmergen
    Plant Cell Jul 2010, 22 (7) 2402-2416; DOI: https://doi.org/10.1105/tpc.109.071902

    This work uses technical advances to quantify the mitochondrial DNA in single cells and provides evidence that the male gamete, rather than the female gamete, plays the most critical role in regulating maternal inheritance of mitochondria in angiosperms.

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    Spatial Uncoupling of Mitosis and Cytokinesis during Appressorium-Mediated Plant Infection by the Rice Blast Fungus Magnaporthe oryzae
    Diane G.O. Saunders, Yasin F. Dagdas, Nicholas J. Talbot
    Plant Cell Jul 2010, 22 (7) 2417-2428; DOI: https://doi.org/10.1105/tpc.110.074492

    This study examines the relationship between nuclear division and cytokinesis during formation of appressoria by a plant pathogenic fungus. It also identifies a key spatial regulator of cytokinesis and nuclear division and shows that it is required for the fungus to cause disease.

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    Entry Mode–Dependent Function of an Indole Glucosinolate Pathway in Arabidopsis for Nonhost Resistance against Anthracnose Pathogens
    Kei Hiruma, Mariko Onozawa-Komori, Fumika Takahashi, Makoto Asakura, Paweł Bednarek, Tetsuro Okuno, Paul Schulze-Lefert, Yoshitaka Takano
    Plant Cell Jul 2010, 22 (7) 2429-2443; DOI: https://doi.org/10.1105/tpc.110.074344

    This work describes a previously undiscovered cellular process that fungi use for entry into leaves: hyphal tip-based entry (HTE) that is independent of appressorium formation. It shows that HTE is the predominant morphogenetic response of Colletotrichum during pathogenesis at wound sites and might have broader significance as infection strategy on fruits during ripening.

  • Open Access
    Activation of an Arabidopsis Resistance Protein Is Specified by the in Planta Association of Its Leucine-Rich Repeat Domain with the Cognate Oomycete Effector
    Ksenia V. Krasileva, Douglas Dahlbeck, Brian J. Staskawicz
    Plant Cell Jul 2010, 22 (7) 2444-2458; DOI: https://doi.org/10.1105/tpc.110.075358

    The Arabidopsis disease resistance protein RPP1 recognizes the ATR1 effector protein from Hyaloperonospora arabidopsidis. This works shows that the molecular basis of recognition is mediated by the in planta association of the LRR domain of the RPP1 protein with the ATR1 effector protein. The in planta association of specific alleles of ATR1 leads to the activation of plant immune responses.

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    A Nitrogen Response Pathway Regulates Virulence Functions in Fusarium oxysporum via the Protein Kinase TOR and the bZIP Protein MeaB
    Manuel S. López-Berges, Nicolas Rispail, Rafael C. Prados-Rosales, Antonio Di Pietro
    Plant Cell Jul 2010, 22 (7) 2459-2475; DOI: https://doi.org/10.1105/tpc.110.075937

    Nitrogen limitation has been proposed to act as a signal for infectious development in plant pathogens. Here, the authors show that the preferred nitrogen source ammonium represses a set of virulence-related functions in the vascular wilt fungus Fusarium oxysporum. They also identify two key elements of the nitrogen response pathway: the conserved protein kinase TOR and the bZIP factor MeaB.

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    The Myosin Motor Domain of Fungal Chitin Synthase V Is Dispensable for Vesicle Motility but Required for Virulence of the Maize Pathogen Ustilago maydis
    Steffi Treitschke, Gunther Doehlemann, Martin Schuster, Gero Steinberg
    Plant Cell Jul 2010, 22 (7) 2476-2494; DOI: https://doi.org/10.1105/tpc.110.075028

    Invasion of plant cells by Ustilago maydis requires cell wall–forming enzymes, such as Mcs1, which has of a chitin synthase fused to a myosin motor head. Surprisingly, this motor head does not deliver the enzyme to the hyphal tip but is required for exocytosis of the chitin synthase. This underlies fungal wall remodeling during infection, which is necessary to avoid activation of plant defenses.

  • Open Access
    The Tig1 Histone Deacetylase Complex Regulates Infectious Growth in the Rice Blast Fungus Magnaporthe oryzae
    Sheng-Li Ding, Wende Liu, Anton Iliuk, Cecile Ribot, Julie Vallet, Andy Tao, Yang Wang, Marc-Henri Lebrun, Jin-Rong Xu
    Plant Cell Jul 2010, 22 (7) 2495-2508; DOI: https://doi.org/10.1105/tpc.110.074302

    This study analyzed a transducin β-like gene (TIG1) from the fungal rice pathogen Magnaporthe oryzae. TIG1 was found to interact with several conserved core proteins to form a histone deacetylase complex, which is critical for invasive growth and conidiogenesis in the rice blast fungus.

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    NENA, a Lotus japonicus Homolog of Sec13, Is Required for Rhizodermal Infection by Arbuscular Mycorrhiza Fungi and Rhizobia but Dispensable for Cortical Endosymbiotic Development
    Martin Groth, Naoya Takeda, Jillian Perry, Hisaki Uchida, Stephan Dräxl, Andreas Brachmann, Shusei Sato, Satoshi Tabata, Masayoshi Kawaguchi, Trevor L. Wang, Martin Parniske
    Plant Cell Jul 2010, 22 (7) 2509-2526; DOI: https://doi.org/10.1105/tpc.109.069807

    NENA was identified by a genetic screen for Lotus japonicus mutants impaired in arbuscular mycorrhiza and encodes a scaffold nucleoporin. nena mutants are also impaired in rhizobial root hair infection but crack entry leading to fully infected root nodules can overcome the rhizodermal nonresponsiveness of nena-1 to Nod factor.

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The Plant Cell Online: 22 (7)
The Plant Cell
Vol. 22, Issue 7
Jul 2010
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