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Plant Physiology

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https://www.readbyqxmd.com/read/27920161/competence-to-flower-age-controlled-sensitivity-to-environmental-cues
#1
Youbong Hyun, René Richter, George Coupland
No abstract text is available yet for this article.
December 5, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27920160/supressor-of-frigida-suf4-supports-gamete-fusion-via-regulating-arabidopsis-ec1-gene-expression
#2
Francesca Resentini, Philippe Cyprys, Joshua G Steffen, Svenja Alter, Pietro Angelo Morandini, Chiara Mizzotti, Alan Lloyd, Gary N Drews, Thomas Dresselhaus, Lucia Colombo, Stefanie Sprunck, Simona Masiero
The EC1 gene family of Arabidopsis thaliana comprises five members that are specifically expressed in the egg cell and redundantly control gamete fusion during double fertilization. We investigated the activity of all five EC1 promoters in promoter-deletion studies and identified SUF4 (SUPPRESSOR OF FRIGIDA 4), a C2H2 transcription factor, as a direct regulator of the EC1 gene expression. In particular, we demonstrated that SUF4 binds to all five Arabidopsis EC1 promoters, thus regulating their expression. The down regulation of SUF4 in homozygous suf4-1 ovules results in reduced EC1 expression and delayed sperm fusion, which can be rescued by expressing SUF4-GUS under control of the SUF4 promoter...
December 5, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27920159/gametophytic-pollen-tube-guidance-attractant-peptides-gametic-controls-and-receptors
#3
Tetsuya Higashiyama, Wei-Cai Yang
No abstract text is available yet for this article.
December 5, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27920158/patterning-the-female-gametophyte-of-flowering-plants
#4
Dawit Girma Tekleyohans, Thomas Nakel, Rita Gross-Hardt
No abstract text is available yet for this article.
December 5, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27920157/two-serk-receptor-like-kinases-interact-with-the-receptor-like-kinase-ems1-in-anther-cell-fate-determination
#5
Zhiyong Li, Yao Wang, Jian Huang, Nagib Ahsan, Gabriel Biener, Joel Paprocki, Jay J Thelen, Valerica Raicu, Dazhong Zhao
Cell signaling pathways mediated by leucine-rich repeat receptor-like kinases (LRR-RLK) are essential for plant growth, development and defense. The EMS1 (EXCESS MICROSPOROCYTES1) LRR-RLK and its small protein ligand TPD1 (TAPETUM DETERMINANT1) play a fundamental role in somatic and reproductive cell differentiation during early anther development in Arabidopsis (Arabidopsis thaliana). However, it is unclear whether other cell surface molecules serve as co-regulators of EMS1. Here, we show that SERK1 (SOMATIC EMBRYOGENESIS RECEPTOR-LIKE KINASE1) and SERK2 LRR-RLKs act redundantly as co-regulatory and physical partners of EMS1...
December 5, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27913741/aik1-a-mitogen-activated-protein-kinase-modulates-abscisic-acid-responses-through-the-mkk5-mpk6-kinase-cascade
#6
Kun Li, Fengbo Yang, Guozeng Zhang, Shufei Song, Yuan Li, Yuchen Miao, Dongtao Ren, Chun-Peng Song
The mitogen-activated protein kinase (MAPK) cascade is an evolutionarily conserved signal transduction module involved in transducing extracellular signals to the nucleus for appropriate cellular adjustment. This cascade essentially consists of three components, a MAPK kinase kinase (MAPKKK), a MAPK kinase (MAPKK) and a MAPK, connected to each other by the event of phosphorylation. Here we report the characterization of a MAPKKK, AIK1, which regulates abscisic acid (ABA) responses in Arabidopsis. T-DNA insertion mutants of AIK1 showed insensitivity to ABA in terms of both root growth and stomatal response...
December 2, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27913740/a-%C3%AE-ketoacyl-coa-synthase-is-involved-in-rice-leaf-cuticular-wax-synthesis-and-requires-a-cer2-like-protein-as-a-cofactor
#7
Xiaochen Wang, Yuanyuan Guan, Du Zhang, Xiangbai Dong, Lihong Tian, Le Qing Qu
Cuticular waxes are complex mixtures of very-long-chain fatty acids (VLCFAs) and their derivatives, forming a natural barrier on aerial surfaces of terrestrial plants against biotic and abiotic stresses. In VLCFA biosynthesis, β-ketoacyl-CoA synthase (KCS) is the key enzyme, catalyzing the first reaction in fatty acid elongation and determining substrate specificity. We isolated a rice (Oryza sativa L.) wax crystal-sparse leaf 4 (WSL4) gene using a map-based cloning strategy. WSL4 is predicted to encode a KCS, a homolog of Arabidopsis CER6...
December 2, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27913739/structure-activity-relation-of-amor-sugar-molecule-that-activates-pollen-tubes-for-ovular-guidance
#8
Jiao Jiao, Akane G Mizukami, Subramanian Sankaranarayanan, Junichiro Yamguchi, Kenichiro Itami, Tetsuya Higashiyama
Successful fertilization in flowering plants depends on the precise directional growth control of pollen tube through the female pistil tissue, towards the female gametophyte contained in the ovule for delivery of non-motile sperm cells. Cysteine-rich peptides LUREs secreted from the synergid cells on either side of the egg cell act as ovular attractants of pollen tubes. Competency control by the pistil is crucial for the response of pollen tubes to these ovular attractants. We recently reported that ovular 4-O-methyl-glucuronosyl arabinogalactan AMOR induces competency of the pollen tube to respond to ovular attractant LURE peptides in Torenia fournieri...
December 2, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27909046/capping-protein-modulates-actin-remodeling-in-response-to-ros-during-plant-innate-immunity
#9
Jiejie Li, Lingyan Cao, Christopher J Staiger
Plants perceive microbe-associated molecular patterns (MAMPs) and damage-associated molecular patterns (DAMPs) to activate innate immune signaling events, such as bursts of reactive oxygen species (ROS). The actin cytoskeleton remodels during the first five minutes of innate immune signaling in Arabidopsis epidermal cells; however, the immune signals that impinge on actin cytoskeleton and its response regulators remain largely unknown. Here, we demonstrate that rapid actin remodeling upon elicitation with diverse MAMPs and DAMPs represents a conserved plant immune response...
December 1, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27909045/a-subset-of-ubiquitin-conjugating-enzymes-are-essential-for-plant-immunity
#10
Bangjun Zhou, Ravi V Mural, Xuanyang Chen, Matt E Oates, Richard A Connor, Gregory B Martin, Julian Gough, Lirong Zeng
Of the three classes of enzymes involved in ubiquitination, ubiquitin-conjugating enzymes (E2) have been often incorrectly considered to play merely an auxiliary role in the process and few E2 enzymes have been investigated in plants. To reveal the role of E2 in plant innate immunity we identified and cloned forty tomato genes encoding E2 proteins. Thioester assays indicated the majority of the genes encode enzymatically active E2. Phylogenetic analysis classified the forty tomato E2 into thirteen groups, of which members of group III were found to interact and act specifically with AvrPtoB, a Pseudomonas syringae pv...
December 1, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27909044/does-early-embryogenesis-in-eudicots-and-monocots-involve-the-same-mechanism-and-molecular-players
#11
Peng Zhao, Kevin Begcy, Thomas Dresselhaus, Meng-Xiang Sun
No abstract text is available yet for this article.
December 1, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27899537/pollen-pistil-interactions-and-their-role-in-mate-selection
#12
Patricia A Bedinger, Amanda Kay Broz, Alejandro Tovar-Mendez, Bruce McClure
No abstract text is available yet for this article.
November 29, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27899536/a-comprehensively-curated-genome-scale-two-cell-model-for-the-cyanobacterium-anabaena-sp-pcc-7120
#13
David Malatinszky, Ralf Steuer, Patrik R Jones
Anabaena sp. PCC 7120 is a nitrogen-fixing filamentous cyanobacterium. Under nitrogen limiting conditions, a fraction of the vegetative cells in each filament terminally differentiate to non-growing heterocysts. Heterocysts are metabolically and structurally specialized to enable O2-sensitive nitrogen fixation. The functionality of the filament, as an association of vegetative cells and heterocysts, is postulated to depend on metabolic exchange of electrons, carbon and fixed nitrogen. In the present work, we compile and evaluate a comprehensive curated stoichiometric model of this two-cell system, with the objective function based on the growth of the filament under diazotrophic conditions...
November 29, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27899535/a-tomato-universal-stress-protein-involved-in-oxidative-stress-is-a-cipk6-phosphorylation-target
#14
Emilio Gutierrez-Beltran, José María Personat, Fernando N de la Torre, Olga Del Pozo
Calcineurin B-like interacting protein kinases (CIPKs) decode calcium signals upon interaction with the calcium sensors calcineurin B like proteins (CBLs) into phosphorylation events that result into adaptation to environmental stresses. Few phosphorylation targets of CIPKs are known and therefore the molecular mechanisms underlying their downstream output responses are not fully understood. Tomato (Solanum lycopersicum) Cipk6 regulates immune and susceptible Programmed cell death (PCD) in immunity transforming Ca2+ signals into Reactive Oxygen Species (ROS) signaling...
November 29, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27899534/substituted-pthalimide-ac94377-is-a-selective-agonist-of-the-gibberellin-receptor-gid1
#15
Kai Jiang, Masato Otani, Hiroaki Shimotakahara, Jung-Min Yoon, Seung-Hyun Park, Tomoko Miyaji, Takeshi Nakano, Hidemitsu Nakamura, Masatoshi Nakajima, Tadao Asami
Gibberellin (GA) is a major plant hormone that regulates plant growth and development, and is widely used as a plant growth regulator in agricultural production. There is an increasing demand for function-limited GA mimics due to the limitations on the agronomical application of GA to crops, including GA's high cost of producing and its leading to the crops' lodging. AC94377, a substituted phthalimide, is a chemical that mimics the growth-regulating activity of GAs in various plants, despite its structural difference...
November 29, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27895208/diurnal-solar-energy-conversion-and-photoprotection-in-rice-canopies
#16
Katherine Georgina Meacham, Xavier Sirault, W Paul Quick, Susanne von Caemmerer, Robert T Furbank
Genetic improvement of photosynthetic performance of cereal crops and increasing the efficiency with which solar radiation is converted into biomass has recently become a major focus for crop physiologists and breeders. The pulse amplitude modulated chlorophyll fluorescence technique (PAM) allows quantitative leaf level monitoring of the utilization of energy for photochemical light conversion and photo-protection in natural environments, potentially over the entire crop lifecycle. Here the diurnal relationship between electron transport rate (ETR) and irradiance was measured in five cultivars of Oryza sativa in canopy conditions with PAM fluorescence under natural solar radiation...
November 28, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27895207/signaling-with-ions-the-keystone-for-apical-cell-growth-and-morphogenesis-in-pollen-tubes
#17
Erwan Michard, Alexander A Simon, Barbara Tavares, Michael M Wudick, Jose A Feijo
No abstract text is available yet for this article.
November 28, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27895206/endosperm-and-imprinting-inextricably-linked
#18
Mary Gehring, P R V Satyaki
No abstract text is available yet for this article.
November 28, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27895205/hybridization-in-plants-old-ideas-new-techniques
#19
Benjamin E Goulet, Federico Roda, Robin Hopkins
No abstract text is available yet for this article.
November 28, 2016: Plant Physiology
https://www.readbyqxmd.com/read/27895204/two-h-type-thioredoxins-interact-with-the-pho2ubiquitin-conjugating-e2-enzyme-to-fine-tune-phosphate-homeostasis
#20
Yinghui Ying, Wenhao Yue, Shoudong Wang, Shuai Li, Min Wang, Yang Zhao, Chuang Wang, Chuanzao Mao, James Whelan, Huixia Shou
Phosphate over-accumulator 2 (PHO2) encodes an ubiquitin-conjugating E2 enzyme that is a major negative regulator of the inorganic phosphate (Pi)-starvation response-signaling pathway. A yeast-two-hybrid (Y2H) screen in Oryza sativa (Os, rice) using OsPHO2 as bait, revealed an interaction between OsPHO2 and two h-type thioredoxins, OsTrxh1 and OsTrxh4. These interactions were confirmed in vivo using bimolecular fluorescence complementation (BiFC) of OsPHO2 and OsTrxh1/h4 in rice protoplasts, and by in vitro pull-down assays with 6His-tagged OsTrxh1/h4 and GST-tagged OsPHO2...
November 28, 2016: Plant Physiology
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