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Plant Cell

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https://www.readbyqxmd.com/read/28646075/ben-rob-and-the-making-of-a-petunia-flower
#1
Jennifer A Lockhart
No abstract text is available yet for this article.
June 23, 2017: Plant Cell
https://www.readbyqxmd.com/read/28646074/divergence-of-the-floral-a-function-between-an-asterid-and-a-rosid-species
#2
Patrice Morel, Klaas Heijmans, Frederique Rozier, Jan Zethof, Sophy Chamot, Suzanne Rodrigues Bento, Aurelie Vialette-Guiraud, Pierre Chambrier, Trehin Christophe, Michiel Vandenbussche
The ABC model is widely used as a genetic framework for understanding floral development and evolution. In this model, the A-function is required for the development of sepals and petals and to antagonize the C-function in the outer floral whorls. In the rosid species Arabidopsis thaliana, the AP2-type AP2 transcription factor represents a major A-function protein, but how the A-function is encoded in other species is not well understood. Here we show that in the asterid species petunia (Petunia hybrida), AP2B/BLIND ENHANCER (BEN) confines the C-function to the inner petunia floral whorls, in parallel with the microRNA BLIND...
June 23, 2017: Plant Cell
https://www.readbyqxmd.com/read/28619883/spatiotemporal-monitoring-of-pseudomonas-effectors-via-type-iii-secretion-using-split-fluorescent-protein-fragments
#3
Eunsook Park, Hye-Young Lee, Jongchan Woo, Doil Choi, Savithramma P Dinesh-Kumar
Pathogenic gram-negative bacteria cause serious diseases in animals and plants. These bacterial pathogens use the type III secretion system (T3SS) to deliver effector proteins into host cells; these effectors then localize to different subcellular compartments to attenuate immune responses by altering biological processes of the host cells. The fluorescent protein (FP)-based approach to monitor effectors secreted from bacteria into the host cells is not possible because the folded FP prevents effector delivery through the T3SS...
June 14, 2017: Plant Cell
https://www.readbyqxmd.com/read/28611021/secrets-of-the-forest-volatiles-first-discovered-in-pine-trees-propagate-defense-signals-within-and-between-plants
#4
Kathleen L Farquharson
No abstract text is available yet for this article.
June 13, 2017: Plant Cell
https://www.readbyqxmd.com/read/28611020/constans-companion-co-binds-the-nf-yb-nf-yc-dimer-and-confers-sequence-specific-dna-binding
#5
Jennifer Mach
No abstract text is available yet for this article.
June 13, 2017: Plant Cell
https://www.readbyqxmd.com/read/28600391/an-emerging-paradigm-rxlr-cleavage-before-effector-secretion
#6
Nancy Rosenbaum Hofmann
No abstract text is available yet for this article.
June 9, 2017: Plant Cell
https://www.readbyqxmd.com/read/28600390/direct-and-indirect-visualization-of-bacterial-effector-delivery-into-diverse-plant-cell-types-during-infection
#7
Elizabeth Henry, Tania Y Toruño, Alain Jauneau, Laurent Deslandes, Gitta Laurel Coaker
To cause disease, diverse pathogens deliver effector proteins into host cells. Pathogen effectors can inhibit defense responses, alter host physiology, and represent important cellular probes to investigate plant biology. However, effector function and localization have primarily been investigated after overexpression in planta. Visualizing effector delivery during infection is challenging due to the plant cell wall, autofluorescence, and low effector abundance. Here, we utilized a GFP strand system to directly visualize bacterial effectors delivered into plant cells through the Type III secretion system...
June 9, 2017: Plant Cell
https://www.readbyqxmd.com/read/28584166/sh3p2-plays-a-crucial-role-at-the-step-of-membrane-tubulation-during-cell-plate-formation-in-plants
#8
Gyeongik Ahn, Hyeran Kim, Dae Heon Kim, Nguyen Hong Hanh, Youngdae Yoon, Indira Singaram, Kaveesha J Wijesinghe, Kristen A Johnson, Xiao-Hong Zhuang, Zizhen Liang, Robert V Stahelin, Liwen Jiang, Wonhwa Cho, Byung-Ho Kang, Inhwan Hwang
During cytokinesis in plants, trans-Golgi network-derived vesicles accumulate at the center of dividing cells and undergo various structural changes to give rise to the planar cell plate. However, how this conversion occurs at the molecular level remains elusive. In this study, we report that SH3 domain-containing protein 2 (SH3P2) in Arabidopsis thaliana plays a crucial role in converting vesicles to the planar cell plate. SH3P2 RNAi plants showed cytokinesis-defective phenotypes and produced aggregations of vesicles at the leading edge of the cell plate...
June 5, 2017: Plant Cell
https://www.readbyqxmd.com/read/28584165/phylogenomic-synteny-network-analysis-of-mads-box-transcription-factor-genes-reveals-lineage-specific-transpositions-ancient-tandem-duplications-and-deep-positional-conservation
#9
Tao Zhao, Rens Holmer, Suzanne de Bruijn, Gerco C Angenent, Harrold A van den Burg, M Eric Schranz
Conserved genomic context provides critical information for comparative evolutionary analysis. With the increase in numbers of sequenced plant genomes, synteny analysis can provide new insight into gene family evolution. Here, we exploit a network analysis approach to organize and interpret massive pairwise syntenic relationships. Specifically, we analyzed synteny networks of the MADS-box transcription factor gene family using fifty-one completed plant genomes. In combination with phylogenetic profiling, several novel evolutionary patterns were inferred and visualized from synteny network clusters...
June 5, 2017: Plant Cell
https://www.readbyqxmd.com/read/28584164/technology-turbocharges-functional-genomics
#10
C Robin Buell, Daniel F Voytas
No abstract text is available yet for this article.
June 5, 2017: Plant Cell
https://www.readbyqxmd.com/read/28584163/protection-of-arabidopsis-blunt-ended-telomeres-is-mediated-by-a-physical-association-with-the-ku-heterodimer
#11
Sona Valuchova, Jaroslav Fulnecek, Zbynek Prokop, Paggy Stolt-Bergner, Eliska Janouskova, Ctirad Hofr, Karel Riha
Telomeres form specialized chromatin that protects natural chromosome termini from being recognized as DNA double-strand breaks. Plants possess unusual blunt-ended telomeres that are unable to form t-loops or complex with single-strand DNA binding proteins, raising the question of the mechanism behind their protection. We have previously suggested that blunt-ended telomeres in Arabidopsis thaliana are protected by Ku, a DNA repair factor with a high affinity for DNA ends. In non-homologous end joining (NHEJ), Ku loads onto broken DNA via a channel consisting of positively charged amino acids...
June 5, 2017: Plant Cell
https://www.readbyqxmd.com/read/28576847/arabidopsis-wrky46-wrky54-and-wrky70-transcription-factors-are-involved-in-brassinosteroid-regulated-plant-growth-and-drought-response
#12
Jiani Chen, Trevor Nolan, Huaxun Ye, Mingcai Zhang, Hongning Tong, Peiyong Xin, Jinfang Chu, Chengcai Chu, Zhaohu Li, Yanhai Yin
Plant steroid hormones, brassinosteroids (BRs), play important roles in growth and development. BR signaling controls the activities of BRASSINOSTERIOD INSENSITIVE1-EMS-SUPPRESSOR 1/ BRASSINAZOLE-RESISTANT 1 (BES1/BZR1) family transcription factors. Besides the role in promoting growth, BRs are also implicated in plant responses to drought stress. However, the molecular mechanisms by which BRs regulate drought response have just begun to be revealed. However, the functions of WRKY transcription factors in BR-regulated plant growth have not been established, although their roles in stress responses are well documented...
June 2, 2017: Plant Cell
https://www.readbyqxmd.com/read/28576846/type-b-arabidopsis-response-regulators-is-critical-to-the-specification-of-shoot-stem-cell-niche-by-dual-regulation-of-wuschel
#13
Wenjing Meng, Zhi Juan Cheng, Ya Lin Sang, Miao Miao Zhang, Xiao Fei Rong, Zhi Wei Wang, Ying Ying Tang, Xian Sheng Zhang
Plants are known for their capacity to regenerate the whole body through de novo formation of apical meristems from a mass of proliferating cells named callus. Exogenous cytokinin and auxin determine cell fate for the establishment of the stem cell niche, which is the vital step of shoot regeneration, but the underlying mechanisms remain unclear. Here we show that type-B ARABIDOPSIS RESPONSE REGULATORs (ARRs), critical components of cytokinin signaling, activate the transcription of WUSCHEL (WUS), which encodes a key regulator for maintaining stem cells...
June 2, 2017: Plant Cell
https://www.readbyqxmd.com/read/28576845/cytokinin-signaling-activates-wuschel-expression-during-axillary-meristem-initiation
#14
Jin Wang, Caihuan Tian, Cui Zhang, Bihai Shi, Xiuwei Cao, Tian-Qi Zhang, Zhong Zhao, Jia-Wei Wang, Yuling Jiao
The homeodomain transcription factor WUSCHEL (WUS) defines the shoot stem cell niche, but the mechanisms underlying the establishment of WUS expression remain unclear. Here, we show that cytokinin signaling precedes WUS expression in leaf axils, and activates WUS expression de novo in the leaf axil to promote axillary meristem initiation. Furthermore, type-B Arabidopsis response regulator proteins (ARRs), which are transcriptional activators in the cytokinin signaling pathway, directly bind to the WUS promoter and activate its expression...
June 2, 2017: Plant Cell
https://www.readbyqxmd.com/read/28576844/the-sequences-of-1-504-mutants-in-the-model-rice-variety-kitaake-facilitate-rapid-functional-genomic-studies
#15
Guotian Li, Rashmi Jain, Mawsheng Chern, Nikki T Pham, Joel A Martin, Tong Wei, Wendy S Schackwitz, Anna M Lipzen, Phat Q Duong, Kyle C Jones, Liangrong Jiang, Deling Ruan, Diane Bauer, Yi Peng, Kerrie W Barry, Jeremy Schmutz, Pamela C Ronald
The availability of a whole-genome sequenced mutant population and the cataloging of mutations of each line at a single-nucleotide resolution facilitate functional genomic analysis. To this end, we generated and sequenced a fast-neutron-induced mutant population in the model rice cultivar Kitaake (Oryza sativa L. ssp. japonica), which completes its life cycle in 9 weeks. We sequenced 1,504 mutant lines at 45-fold coverage and identified 91,513 mutations affecting 32,307 genes, i.e., 58% of all rice genes. We detected an average of 61 mutations per line...
June 2, 2017: Plant Cell
https://www.readbyqxmd.com/read/28559476/noncanonical-alternative-polyadenylation-contributes-to-gene-regulation-in-response-to-hypoxia
#16
Laura de Lorenzo, Reed Sorenson, Julia Bailey-Serres, Arthur G Hunt
Stresses from various environmental challenges continually confront plants, and their responses are important for growth and survival. One molecular response to such challenges involves the alternative polyadenylation of mRNA. In plants, it is unclear how stress affects the production and fate of alternative mRNA isoforms. Using a genome-scale approach, we show that in Arabidopsis thaliana, hypoxia leads to increases in the number of mRNA isoforms with polyadenylated 3' ends that map to 5'-UTRs, introns and protein-coding regions...
May 30, 2017: Plant Cell
https://www.readbyqxmd.com/read/28559475/interplay-of-plasma-membrane-and-vacuolar-ion-channels-together-with-bak1-elicits-rapid-cytosolic-calcium-elevations-in-arabidopsis-during-aphid-feeding
#17
Thomas R Vincent, Marieta Avramova, James Canham, Peter Higgins, Natasha Bilkey, Sam T Mugford, Marco Pitino, Masatsugu Toyota, Simon Gilroy, Tony J Miller, Saskia Hogenhout, Dale Sanders
A transient rise in cytosolic calcium ion concentration is one of the main signals used by plants in perception of their environment. The role of calcium in the detection of abiotic stress is well documented; however, its role during biotic interactions remains unclear. Here, we use a fluorescent calcium biosensor (GCaMP3) in combination with the green peach aphid (Myzus persicae) as a tool to study Arabidopsis thaliana calcium dynamics in vivo and in real time during a live biotic interaction. We demonstrate rapid and highly-localised plant calcium elevations around the feeding sites of M...
May 30, 2017: Plant Cell
https://www.readbyqxmd.com/read/28550151/evolutionary-footprints-reveal-insights-into-plant-microrna-biogenesis
#18
Uciel Chorostecki, Belen Moro, Arantxa L M Rojas, Juan M Debernardi, Arnaldo L Schapire, Cedric Notredame, Javier Palatnik
MicroRNAs (miRNAs) are endogenous small RNAs that recognize target sequences by base complementarity and play a role in the regulation of target gene expression. They are processed from longer precursor molecules that harbor a fold-back structure. Plant miRNA precursors are quite variable in size and shape, and are recognized by the processing machinery in different ways. However, ancient miRNAs and their binding sites in target genes are conserved during evolution. Here, we designed a strategy to systematically analyze MIRNAs from different species generating a graphical representation of the conservation of the primary sequence and secondary structure...
May 26, 2017: Plant Cell
https://www.readbyqxmd.com/read/28550150/cellulose-synthesis-and-cell-expansion-are-regulated-by-different-mechanisms-in-growing-arabidopsis-hypocotyls
#19
Alexander A Ivakov, Anna Flis, Federico Apelt, Maximilian Fuenfgeld, Ulrike Scherer, Mark Stitt, Friedrich Kragler, Kris Vissenberg, Staffan Persson, Dmitry Suslov
Plant growth is sustained by two complementary processes - biomass biosynthesis and cell expansion. The cell wall is crucial to both as it forms the majority of biomass, while its extensibility limits cell expansion. Cellulose is a major component of the cell wall and cellulose synthesis is pivotal to plant cell growth and its regulation is poorly understood. Using periodic diurnal variation in Arabidopsis thaliana hypocotyl growth, we found that cellulose synthesis and cell expansion can be uncoupled and are regulated by different mechanisms...
May 26, 2017: Plant Cell
https://www.readbyqxmd.com/read/28550149/the-jasmonate-activated-transcription-factor-mdmyc2-regulates-ethylene-response-factor-and-ethylene-biosynthetic-genes-to-promote-ethylene-biosynthesis-during-apple-fruit-ripening
#20
Tong Li, Yaxiu Xu, Lichao Zhang, Yinglin Ji, Dongmei Tan, Hui Yuan, Aide Wang
The plant hormone ethylene is critical for ripening in climacteric fruits, including apple (Malus domestica). Jasmonate (JA) promotes ethylene biosynthesis in apple fruit, but the underlying molecular mechanism is unclear. Here we found that JA-induced ethylene production in apple fruit is dependent on the expression of MdACS1, an ACC synthase gene involved in ethylene biosynthesis. The expression of MdMYC2, encoding a transcription factor involved in the JA signaling pathway, was enhanced by MeJA treatment in apple fruits, and MdMYC2 directly bound to the promoters of both MdACS1 and the ACC oxidase gene MdACO1 and enhanced their transcription...
May 26, 2017: Plant Cell
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