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Plant & Cell Physiology

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https://www.readbyqxmd.com/read/29149328/mir858-mediated-regulation-of-flavonoid-specific-myb-transcription-factor-genes-controls-resistance-to-pathogen-infection-in-arabidopsis
#1
Rosany Camargo-Ramírez, Beatriz Val-Torregrosa, Blanca San Segundo
MicroRNAs (miRNAs) are a class of short endogenous non-coding small RNAs that direct post-transcriptional gene silencing in eukaryotes. In plants, the expression of a large number of miRNAs has been shown to be regulated during pathogen infection. However, the functional role of the majority of these pathogen-regulated miRNAs has not been elucidated. In this work, we investigated the role of Arabidopsis miR858 in the defense response of Arabidopsis plants to infection by fungal pathogens with necrotrophic (Plectosphaerella cucumerina) or hemibiotrophic (Fusarium oxysporum and Colletotrichum higginsianum) lifestyles...
November 15, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29149301/use-of-domain-swapping-to-identify-candidate-amino-acids-involved-in-differential-interactions-between-two-allelic-variants-of-type-1%C3%A2-s-locus-f-box-protein-and-s3-rnase-in-petunia-inflata
#2
Lihua Wu, Justin S Williams, Ning Wang, Wasi A Khatri, Daniele San Román, Teh-Hui Kao
Petunia inflata possesses a self-incompatibility (SI) mechanism, which involves S-RNase and multiple S-locus F-box (SLF) genes at the polymorphic S-locus. For a given S-haplotype, each SLF is thought to interact with some of its non-self S-RNases, but not with its self-S-RNase. In this work, we studied an allelic pair of SLF1, S2-SLF1 and S3-SLF1, which differ in 44 amino acids and show differential interactions with S3-RNase. We first used an in vivo transgenic assay to determine whether four chimeric proteins of S2-SLF1 and S3-SLF1, each with one of the three functional domains swapped, interact with S3-RNase...
November 15, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29149288/overexpression-of-seipin1-increases-oil-in-hydroxy-fatty-acid-accumulating-seeds
#3
Daniel Lunn, James G Wallis, John Browse
While plant oils are an important source of food, plants also produce oils containing specialized fatty acids with chemical and physical properties valued in industry. Ricinoleic acid, a hydroxy-fatty acid (HFA) produced in the seed of castor (Ricinus communis), is of particular value with a wide range of applications. Since castor cultivation is currently successful only in tropic climates, and because castor seed contain the toxin ricin, there are ongoing efforts to develop a temperate crop capable of HFA biosynthesis...
November 15, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29145642/arf2-4-and-arf5-are-essential-for-female-and-male-gametophyte-development-in-arabidopsis
#4
Zhenning Liu, Liming Miao, Ruxue Huo, Xiaoya Song, Johnson Cameron, Lijun Kong, Venkatesan Sundaresan, Xiaolin Yu
The plant hormone auxin plays critical roles in plant growth and development. Auxin response factors (ARFs) are a class of transcription factors which regulate auxin-mediated gene expression. While the functions of ARFs in sporophytic development have been well characterized, their functions specific to gametophytic development have not been studied extensively. In this study, Arabidopsis ARF genes were selectively down-regulated in gametophytes by mis-expression of targeted microRNAs (amiRARF234, amiRARFMP and MIR167a) to silence AtARF2-4, AtARF5, AtARF6 and AtARF8...
November 14, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29145635/trex-a-web-portal-for-exploration-of-trna-derived-fragments-in-arabidopsis-thaliana
#5
Agnieszka Thompson, Andrzej Zielezinski, Patrycja Plewka, Maciej Szymanski, Przemyslaw Nuc, Zofia Szweykowska-Kulinska, Artur Jarmolowski, Wojciech M Karlowski
tRNA-derived fragments (tRFs) constitute a new class of short regulatory RNAs that are a product of nascent or mature tRNA processing. tRF sequences have been identified in all domains of life; however, most published research pertains to human, yeast and some bacterial organisms. Despite growing interest in plant tRFs and accumulating evidence of their function in plant development and stress responses, no public, web-based repository dedicated to these molecules is currently available. Here, we introduce tRex (http://combio...
November 14, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29140457/genistein-specific-g6dt-gene-for-the-inducible-production-of-wighteone-in-lotus-japonicus
#6
Jinyue Liu, Wenbo Jiang, Yaying Xia, Xuemin Wang, Guoan Shen, Yongzhen Pang
Prenylated isoflavonoids were found in several legume plants, and they possess various biological activities that play important roles in both plant defense and human health. However, it is still unknown whether prenylated isoflavonoids are present in the model legume plant L. japonicus. In the present study, we found that the prenylated isoflavonoid wighteone was produced in L. japonicus when the leaf was supplemented with genistein. Furthermore, a novel prenyltransferase gene LjG6DT was identified, which shared high similarity and was closely related with several known prenyltransferase genes involved in isoflavonoid biosynthesis...
November 10, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29136239/changes-in-membrane-lipid-composition-and-function-accompanying-chilling-injury-in-bell-peppers
#7
Ximan Kong, Baodong Wei, Zhu Gao, Ying Zhou, Fei Shi, Xin Zhou, Qian Zhou, Shujuan Ji
Bell peppers are vulnerable to low temperature (below 7 °C) and subject to chilling injury (CI). To elucidate the relationship between cell membrane lipid composition and CI, a membrane lipidomic approach was carried out. In addition, we performed microstructural analysis and low-field nuclear magnetic resonance to better understand CI. We also monitored primary physiological metabolism parameters to explain lipidomics. Our study indicated that cellular structure damage was more serious at 4 °C, mostly represented by plasmalemma damage and plastid degradation...
November 9, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29136205/transcription-factor-asmyc2-controls-the-jasmonate-responsive-expression-of-ass1-regulating-sesquiterpene-biosynthesis-in-aquilaria-sinensis-lour-gilg
#8
Yan-Hong Xu, Yong-Cui Liao, Fei-Fei Lv, Zheng Zhang, Pei-Wen Sun, Zhi-Hui Gao, Ke-Ping Hu, Chun Sui, Yue Jin, Jian-He Wei
No abstract text is available yet for this article.
November 9, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29136202/a-conceptual-framework-for-cell-identity-transitions-in-plants
#9
Idan Efroni
Multicellular organisms develop from a single cell that proliferates to form different cell types with specialized functions. Sixty years ago, Waddington's suggested the "epigenetic landscape" as a useful metaphor for the process. According to this view, cells move through a rugged identity space along genetically-encoded trajectories, until arriving at one of possible final fates. In plants in particular, these trajectories also have strong spatial correlates, as cell identity is intimately linked to its relative position within the plant...
November 9, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29121271/genome-wide-identification-of-arabidopsis-lbd29-target-genes-reveals-the-molecular-events-behind-auxin-induced-cell-reprograming-during-callus-formation
#10
Chongyi Xu, Huifen Cao, Enjun Xu, Shiqi Zhang, Yuxin Hu
Auxin-induced callus formation represents an important cell reprograming process during in vitro regeneration of plants, in which the pericycle or pericycle-like cells within plant organs are reprogramed into the pluripotent cell mass termed callus that is generally required for subsequent regeneration of root or shoot. However, the molecular events behind cell reprograming during auxin-induced callus formation are largely elusive. We previously identified that auxin-induced LBD transcription factors act as the master regulators to trigger auxin-induced callus formation...
November 7, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29121266/stress-inducible-galactinol-synthase-of-chickpea-cagols-implicates-in-heat-and-oxidative-stress-tolerance-through-reducing-stress-induced-excessive-reactive-oxygen-species-accumulation
#11
Prafull Salvi, Nitin Uttam Kamble, Manoj Majee
Raffinose Family Oligosaccharides (RFOs) participates in various aspects of plant physiology and galactinol synthase (GolS, EC 2.4.1.123) catalyzes the key step of RFO biosynthesis. Stress induced accumulation of RFOs particularly galactinol and raffinose has been reported in few plants; however their precise role and mechanistic insight in stress adaptation remain elusive. In present study, we have shown that the GolS activity as well as galactinol and raffinose content are significantly increased in response to various abiotic stresses in chickpea...
November 7, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29121241/suppressing-type-2c-protein-phosphatases-alters-fruit-ripening-and-the-stress-response-in-tomato
#12
Yushu Zhang, Qian Li, Li Jiang, Wenbin Kai, Bin Liang, Juan Wang, Yangwei Du, Xiawan Zhai, Jieling Wang, Yingqi Zhang, Yufei Sun, Lusheng Zhang, Ping Leng
Although abscisic acid (ABA) signalling has been widely studied in Arabidopsis, the roles of core ABA signalling components in fruit remain poorly understood. Herein, we characterise SlPP2C1, a group A type 2C protein phosphatase that negatively regulates ABA signalling and fruit ripening in tomato. The SlPP2C1 protein was localised in the cytoplasm close to AtAHG3/AtPP2CA. The SlPP2C1 gene was expressed in all tomato tissues throughout development, particularly in flowers and fruits, and it was up-regulated by dehydration and ABA treatment...
November 7, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29112727/application-of-crispr-interference-for-metabolic-engineering-of-the-heterocyst-forming-multicellular-cyanobacterium-anabaena-sp-pcc-7120
#13
Akiyoshi Higo, Atsuko Isu, Yuki Fukaya, Shigeki Ehira, Toru Hisabori
Anabaena sp. PCC 7120 (A. 7120) is a heterocyst-forming multicellular cyanobacterium that performs nitrogen fixation. This cyanobacterium has been extensively studied as a model for multicellularity in prokaryotic cells. We have been interested in photosynthetic production of nitrogenous compounds using A. 7120. However, the lack of efficient gene repression tools has limited its usefulness. We originally developed an artificial endogenous gene repression method in this cyanobacterium using small antisense RNA (Higo A...
November 3, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29095998/localization-and-organization-of-scopolamine-biosynthesis-in-duboisia-myoporoides-r-br
#14
Kathrin Laura Kohnen, Selahaddin Sezgin, Michael Spiteller, Hansjörg Hagels, Oliver Kayser
Tropane alkaloids (TAs), especially hyoscyamine and scopolamine, are important precursors for anticholinergic and antispasmodic drugs. Hyoscyamine and scopolamine are currently obtained at commercial scale from hybrid crosses of Duboisia myoporoides x Duboisia leichhardtii plants. In this study, we present a global investigation of localization and organization of TA biosynthesis in a Duboisia myoporoides R. Br. wildtype line. The tissue-specific spatial distribution of TAs within D. myoporoides is presented, including quantification of the TAs littorine, 6-hydroxy hyoscyamine, hyoscyamine, scopolamine, and additionally, hyoscyamine aldehyde as well as scopolamine glucoside...
October 31, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29088489/spatio-temporal-gene-induction-systems-in-the-heterocyst-forming-multicellular-cyanobacterium-anabaena-sp-pcc-7120
#15
Akiyoshi Higo, Atsuko Isu, Yuki Fukaya, Toru Hisabori
In the last decade, much progress has been made on the photosynthetic production of valuable products using unicellular cyanobacteria. However, production of some products requires dark, anaerobic incubation, which prevents practical applications using these organisms. Anabaena sp. PCC 7120 (A. 7120) is a heterocyst-forming multicellular cyanobacterium that is easy to manipulate genetically. Upon nitrogen step-down, this strain differentiates heterocysts that retain microoxic conditions for nitrogen fixation...
October 27, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29088399/tulipa-gesneriana-and-lilium-longiflorum-pebp-genes-and-their-putative-roles-in-flowering-time-control
#16
Hendrika A C F Leeggangers, Tamar Rosilio-Brami, Judit Bigas-Nadal, Noam Rubin, Aalt D J van Dijk, Francisco F Nunez de Caceres Gonzalez, Shani Saadon-Shitrit, H Nijveen, Henk W M Hilhorst, Richard G H Immink, Michele Zaccai
Floral induction in Tulipa gesneriana and Lilium longiflorum is triggered by contrasting temperature conditions, high and low temperature respectively. In Arabidopsis, the floral integrator FLOWERING LOCUS T (FT), member of the PEBP gene family, is a key player in flowering time control. In this study, one PEBP gene was identified and characterized in lily (LlFT) and three PEBP genes were isolated from tulip (TgFT1, TgFT2 and TgFT3). Over-expression of these genes in Arabidopsis thaliana resulted in an early flowering phenotype for LlFT and TgFT2, but a late flowering phenotype for TgFT1 and TgFT3...
October 27, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29069477/cluster-level-relationships-of-genes-involved-in-carbon-metabolism-in-synechocystis-sp-pcc-6803-development-of-a-novel-succinate-producing-strain
#17
Masahiro Takeya, Hiroko Iijima, Haruna Sukigara, Takashi Osanai
We quantified the transcript levels of 44 genes related to sugar catabolism in strains with altered primary carbon metabolism and discovered a consistent expression pattern among succinate-producing mutants. To identify factors that determine the expression pattern, we calculated Pearson's correlation coefficients, using the transcript data. Correlation analysis revealed positive and negative correlations among genes encoding sugar catabolic enzymes. On the basis of this analysis, we found that the mutant overexpressing both rre37 (encoding an OmpR-type response regulator) and sigE (encoding an RNA polymerase sigma factor) produced increased levels of succinate under dark, anaerobic conditions, with a maximum productivity of 420 mg/L...
October 24, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29069446/6-4-pp-photolyase-encoded-by-atuvr3-is-localized-in-nuclei-chloroplasts-and-mitochondria-and-its-expression-is-down-regulated-by-light-in-a-photosynthesis-dependent-manner
#18
Agnieszka Katarzyna Banas, Pawel Hermanowicz, Olga Sztatelman, Justyna Labuz, Chhavi Aggarwal, Piotr Zglobicki, Dominika Jagiello-Flasinska, Wojciech Strzalka
Pyrimidine dimers are the most important DNA lesions induced by UVB irradiation. They can be repaired directly by photoreactivation or indirectly by the excision repair pathways. Photoreactivation is performed by photolyases, enzymes which bind to the dimers and use the energy of blue light or UVA to split bonds between adjacent pyrimidines. Arabidopsis thaliana has three known photolyases: AtPHR1, AtCRY3 and AtUVR3. Little is known about the cellular localization and regulation of AtUVR3 expression. We have found that its transcript level is down-regulated by light (red, blue or white) in a photosynthesis-dependent manner...
October 24, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29069432/sumo-e3-ligase-slsiz1-facilitates-heat-tolerance-in-tomato
#19
Song Zhang, Shiju Wang, Jinlian Lv, Zhuangbin Liu, Yong Wang, Nana Ma, Qingwei Meng
High temperature has become a major abiotic stress that limits crop productivity. Heat shock transcription factors (HSFs) and heat shock proteins (HSPs) play important roles in enhancing thermotolerance of plants. SUMOylation is an important post-translational modification in regulating cellular functions in eukaryotes. SIZ1, a well-characterized SUMO E3 ligase, mediates process of SUMOylation. In this study, SUMO conjugations were clearly induced by high temperature. Overexpression of SIZ1 SUMO E3 ligase (SlSIZ1) in tomato could enhance the tolerance to heat stress in tomato...
October 24, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/29069481/enhanced-cold-tolerance-and-tillering-in-switchgrass-panicum-virgatum-l-by-heterologous-expression-of-osa-mir393a
#20
Yanrong Liu, Kexin Wang, Dayong Li, Jianping Yan, Wanjun Zhang
MicroRNA393 (miR393) family is one of the conserved miRNA families in the plant kingdom. MiR393 was reported to positively regulate rice tillering and abiotic stress resistances through auxin signaling pathway. However, little is known about the function of miR393 in switchgrass ( Panicum virgatum L.), an important bioenergy C4 grass plant. We tested the expression level of miR393 and its four putative target genes ( PvAFB1 , PvAFB2 , PvAFB3 and PvTIR1 ) in switchgrass, and found these genes were all responded to cold stress and exogenous NAA treatment...
October 23, 2017: Plant & Cell Physiology
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