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https://www.readbyqxmd.com/read/28642766/high-throughput-screening-method-for-identifying-potential-agonists-and-antagonists-of-arabidopsis-thaliana-cytokinin-receptor-cre1-ahk4
#1
Pavel Klimeš, Dušan Turek, Pavel Mazura, Lucia Gallová, Lukáš Spíchal, Břetislav Brzobohatý
The CRE1/AHK4 cytokinin receptor is an important component of plants' hormone signaling systems, and compounds that can alter its activity have potential utility for studying the receptor's functions and/or developing new plant growth regulators. A high throughput method was developed for screening compounds with agonist or antagonist properties toward the CRE1/AHK4 cytokinin receptor in a single experiment using the Nanodrop II liquid handling system and 384-well plates. Potential ligands are screened directly, using a reporter system in which receptor signaling activity triggers expression of β-galactosidase in Escherichia coli...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28641138/changes-in-lipid-peroxidation-in-stay-green-leaves-of-tobacco-with-senescence-induced-synthesis-of-cytokinins
#2
Maria Pilarska, Ernest Skowron, Rafał Pietraś, Karin Krupinska, Ewa Niewiadomska
The involvement of reactive oxygen species (ROS) in the progress of leaf senescence has long been suggested, but there are contrasting results to either support or deny the positive correlation between the senescence progression and the level of ROS-triggered lipid peroxidation. The inconsistency among reported results can partly be attributed to the poor specificity of the most commonly employed colorimetric assay and changes in the ratio of dry weight/fresh weight during leaf senescence. In this study we determined the end-product of lipid peroxidation malondialdehyde (MDA) by GS-MS, and analyzed its changes during senescence of tobacco leaves as calculated on dry weight basis...
June 15, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28636152/dynamics-and-origin-of-cytokinins-involved-in-plant-manipulation-by-a-leaf-mining-insect
#3
Hui Zhang, Antoine Guiguet, Géraldine Dubreuil, Anna Kisiala, Peter Andreas, R J Neil Emery, Elisabeth Huguet, Mélanie Body, David Giron
Several herbivorous insects and plant-associated microorganisms control the phytohormonal balance, thus enabling them to successfully exploit the plant by inhibiting plant defences and withdrawing plant resources for their own benefit. The leaf-mining moth Phyllonorycter blancardella modifies the cytokinin (CK) profile of mined leaf-tissues, and the insect symbiotic bacteria Wolbachia is involved in the plant manipulation to the benefit of the insect host. To gain a deeper understanding into the possible origin and dynamics of CKs, we conducted an extensive characterization of CKs in larvae and in infected apple leaves...
June 21, 2017: Insect Science
https://www.readbyqxmd.com/read/28633292/ahp2-ahp3-and-ahp5-act-downstream-of-cki1-in-arabidopsis-female-gametophyte-development
#4
Zhenning Liu, Li Yuan, Xiaoya Song, Xiaolin Yu, Venkatesan Sundaresan
Histidine phosphotransfer proteins (HPs) are key elements of the two-component signaling system, which act as a shuttle to transfer phosphorylation signals from histidine kinases (HKs) to response regulators (RRs). CYTOKININ INDEPENDENT 1 (CKI1), a key regulator of central cell specification in the Arabidopsis female gametophyte, activates the cytokinin signaling pathway through the Arabidopsis histidine phosphotransfer proteins (AHPs). There are five HP genes in Arabidopsis, AHP1-AHP5, but it remains unknown which AHP genes act downstream of CKI1 in Arabidopsis female gametophyte development...
June 13, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28629320/transcriptomic-changes-reveal-gene-networks-responding-to-the-overexpression-of-a-blueberry-dwarf-and-delayed-flowering-1-gene-in-transgenic-blueberry-plants
#5
Guo-Qing Song, Xuan Gao
BACKGROUND: Constitutive expression of the CBF/DREB1 for increasing freezing tolerance in woody plants is often associated with other phenotypic changes including dwarf plant and delayed flowering. These phenotypic changes have been observed when Arabidopsis DWARF AND DELAYED FLOWERING 1 (DDF1) was overexpressed in A. thaliana plants. To date, the DDF1 orthologues have not been studied in woody plants. The aim of this study is to investigate transcriptomic responses to the overexpression of blueberry (Vaccinium corymbosum) DDF1 (herein, VcDDF1-OX)...
June 19, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28618065/cold-interferes-with-male-meiotic-cytokinesis-in-arabidopsis-thaliana-independently-of-the-ahk2-3-ahp2-3-5-cytokinin-signaling-module
#6
Bing Liu, Nico De Storme, Danny Geelen
Previously we have shown that low temperature stress in Arabidopsis causes defects in microtubule organization and cytokinesis in male meiocytes, which leads to the formation of diploid pollen. Because cytokinin (CK) mediates multiple physiological responses to cold stress, we investigated whether CK signaling is involved in cold-induced diploid pollen formation. To this end, we monitored male sporogenesis in a series of mutants defective in CK metabolism and signalling. Arabidopsis plants with altered CK homeostasis, i...
June 15, 2017: Cell Biology International
https://www.readbyqxmd.com/read/28604820/comparative-transcriptome-analysis-provides-insights-into-molecular-mechanisms-for-parthenocarpic-fruit-development-in-eggplant-solanum-melongena-l
#7
Xia Chen, Min Zhang, Jie Tan, Shuping Huang, Chunli Wang, Hongyuan Zhang, Taiming Tan
Genetic control of parthenocarpy, a desirable trait in edible fruit with hard seeds, has been extensively studied. However, the molecular mechanism of parthenocarpic fruit development in eggplant (Solanum melongena L.) is still unclear. To provide insights into eggplant parthenocarpy, the transcriptomic profiles of a natural parthenocarpic (PP05) and two non-parthenocarpic (PnP05 and GnP05) eggplant lines were analyzed using RNA-sequencing (RNA-seq) technology. These sequences were assembled into 38925 unigenes, of which 22683 had an annotated function and 3419 were predicted as novel genes or from alternative splicing...
2017: PloS One
https://www.readbyqxmd.com/read/28603082/regulation-and-physiological-role-of-silicon-in-alleviating-drought-stress-of-mango
#8
Mohamed Naser Helaly, Hanan El-Hoseiny, Nabil Ibrahim El-Sheery, Anshu Rastogi, Hazem M Kalaji
Improvement of drought stress of mango plants requires intensive research that focuses on physiological processes. In three successive seasons (2014, 2015and 2016) field experiments with four different strains of mango were subjected to two water regimes. The growth and physiological parameters of possible relevance for drought stress tolerances in mango were investigated. Yield and its components were also evaluated. The data showed that all growth and physiological parameters were increased under K2SiO3 (Si) supplement and were followed by the interaction treatment (Si treatment and its combination with drought stress) compared to that of the controlled condition...
June 3, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28600354/synergistic-action-of-auxin-and-cytokinin-mediates-aluminum-induced-root-growth-inhibition-in-arabidopsis
#9
Zhong-Bao Yang, Guangchao Liu, Jiajia Liu, Bing Zhang, Wenjing Meng, Bruno Müller, Ken-Ichiro Hayashi, Xiansheng Zhang, Zhong Zhao, Ive De Smet, Zhaojun Ding
Auxin acts synergistically with cytokinin to control the shoot stem-cell niche, while both hormones act antagonistically to maintain the root meristem. In aluminum (Al) stress-induced root growth inhibition, auxin plays an important role. However, the role of cytokinin in this process is not well understood. In this study, we show that cytokinin enhances root growth inhibition under stress by mediating Al-induced auxin signaling. Al stress triggers a local cytokinin response in the root-apex transition zone (TZ) that depends on IPTs, which encode adenosine phosphate isopentenyltransferases and regulate cytokinin biosynthesis...
June 9, 2017: EMBO Reports
https://www.readbyqxmd.com/read/28597423/illumina-based-transcriptomic-profiling-of-panax-notoginseng-in-response-to-arsenic-stress
#10
Yanfang Liu, Yanhua Mi, Jianhua Zhang, Qiwan Li, Lu Chen
BACKGROUND: Panax notoginseng, a famous herbal medicine, has recently attracted great attention on its safety and quality since P. notoginseng can accumulate and tolerate As from growing environment. For the purpose of understanding As damage to the quality of P. notoginseng as well as corresponding tolerance mechanisms, genes involved in As stress response were identified using Illumina sequencing. RESULTS: Totally 91,979,946 clean reads were generated and were de novo assembled into 172,355 unigenes...
December 2016: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/28594268/simultaneous-but-spatially-different-regulation-of-non-photosynthetic-callus-formation-and-photosynthetic-root-development-after-shoot-removal
#11
Koichi Kobayashi, Akira Iwase
Plants coordinate plastid differentiation and cellular differentiation during tissue development. Recently, we reported a mechanism of chloroplast development and photosynthetic improvement in Arabidopsis roots after shoot removal. Shoot removal induces the expression of WOUND INDUCED DEDIFFERENTIATION (WIND) transcription factors at the wound site, which activates type-B ARABIDOPSIS RESPONSE REGULATOR (ARR)-mediated cytokinin signaling in roots. The type-B ARR signaling upregulates chloroplast-related transcription factors along with photosynthesis-associated genes, thereby inducing chloroplast development in detached roots...
June 8, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28592854/transcriptomic-analysis-of-short-fruit-1-sf1-reveals-new-insights-into-the-variation-of-fruit-related-traits-in-cucumis-sativus
#12
Lina Wang, Chenxing Cao, Shuangshuang Zheng, Haiyang Zhang, Panjing Liu, Qian Ge, Jinrui Li, Zhonghai Ren
Fruit size is an important quality trait in different market classes of Cucumis sativus L., an economically important vegetable cultivated worldwide, but the genetic and molecular mechanisms that control fruit size are largely unknown. In this study, we isolated a natural cucumber mutant, short fruit 1 (sf1), caused by a single recessive Mendelian factor, from the North China-type inbred line CNS2. In addition to significantly decreased fruit length, other fruit-related phenotypic variations were also observed in sf1 compared to the wild-type (WT) phenotype, indicating that sf1 might have pleiotropic effects...
June 7, 2017: Scientific Reports
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/28573759/persistence-of-plant-hormone-levels-in-rice-shoots-grown-under-microgravity-conditions-in-space-its-relationship-to-maintenance-of-shoot-growth
#15
Kazuyuki Wakabayashi, Kouichi Soga, Takayuki Hoson, Toshihisa Kotake, Mikiko Kojima, Hitoshi Sakakibara, Takashi Yamazaki, Akira Higashibata, Noriaki Ishioka, Toru Shimazu, Motoshi Kamada
We investigated the effects of microgravity environment on growth and plant hormone levels in dark-grown rice shoots cultivated in artificial 1 g and microgravity conditions on the International Space Station (ISS). Growth of microgravity-grown shoots was comparable to that of 1 g-grown shoots. Endogenous levels of indole-3-acetic acid (IAA) in shoots remained constant, while those of abscisic acid (ABA), jasmonic acid (JA), cytokinins (CKs), and gibberellins (GAs) decreased during the cultivation period under both conditions...
June 1, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28569011/insourcerer-a-high-throughput-method-to-search-for-unknown-metabolite-modifications-by-mass-spectrometry
#16
Aida Mrzic, Frederik Lermyte, Trung Nghia Vu, Dirk Valkenborg, Kris Laukens
RATIONALE: Using mass spectrometry, the analysis of known metabolite structures has become feasible in a systematic high-throughput fashion. Nevertheless, the identification of previously unknown structures remains challenging, partially because many unidentified variants originate from known molecules that underwent unexpected modifications. Here, we present a method for the discovery of unknown metabolite modifications and conjugate metabolite isoforms in a high-throughput fashion. METHODS: The method is based on user controlled in-source fragmentation which is used to induce loss of weakly bound modifications...
June 1, 2017: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28543596/transcriptional-regulation-of-hormone-synthesis-and-signaling-pathways-by-overexpressing-cytokinin-synthesis-contributes-to-improved-drought-tolerance-in-creeping-bentgrass
#17
Yi Xu, Patrick Burgess, Bingru Huang
The objective of this study was to investigate transcriptomic changes and molecular factors regulated by cytokinins that may contribute to improved drought tolerance in creeping bentgrass (Agrostis stolonifera) overexpressing adenine isopentenyltransferase (ipt). Wild-type (WT) and ipt-transgenic plants were maintained well irrigated or exposed to 21 d of drought stress in growth chambers. Transcriptomic analysis conducted by RNA-seq revealed 661 and 648 up-regulated and 764 and 862 down-regulated drought-responsive genes (DRGs) in the WT and ipt-transgenic plants, respectively, under drought stress using adjusted p-value of 0...
May 24, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28510189/multiple-regulatory-roles-of-ap2-erf-transcription-factor-in-angiosperm
#18
REVIEW
Chao Gu, Zhi-Hua Guo, Ping-Ping Hao, Guo-Ming Wang, Zi-Ming Jin, Shao-Ling Zhang
APETALA2/ethylene response factor (AP2/ERF) transcription factor (TF) is a superfamily in plant kingdom, which has been reported to be involved in regulation of plant growth and development, fruit ripening, defense response, and metabolism. As the final response gene in ethylene signaling pathway, AP2/ERF TF could feedback modulate phytohormone biosynthesis, including ethylene, cytokinin, gibberellin, and abscisic acid. Moreover, AP2/ERF TF also participates in response to the signals of auxin, cytokinin, abscisic acid, and jasmonate...
December 2017: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/28505379/analysis-of-cfb-a-cytokinin-responsive-gene-of-arabidopsis-thaliana-encoding-a-novel-f-box-protein-regulating-sterol-biosynthesis
#19
Wolfram G Brenner, Jan Erik Leuendorf, Anne Cortleven, Laetitia B B Martin, Hubert Schaller, Thomas Schmülling
Protein degradation by the ubiquitin-26S proteasome pathway is important for the regulation of cellular processes, but the function of most F-box proteins relevant to substrate recognition is unknown. We describe the analysis of the gene Cytokinin-induced F-box encoding (CFB, AT3G44326), identified in a meta-analysis of cytokinin-related transcriptome studies as one of the most robust cytokinin response genes. F-box domain-dependent interaction with the E3 ubiquitin ligase complex component ASK1 classifies CFB as a functional F-box protein...
May 12, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28504136/fabrication-of-sustained-release-ca-pu-coaxial-electrospun-fiber-membranes-for-plant-grafting-application
#20
Zhongfu Guo, Guosheng Tang, Yonghong Zhou, Liu Shuwu, Haoqing Hou, Zhenyu Chen, Jinhui Chen, Chunhong Hu, Fei Wang, Stefaan C De Smedt, Ranhua Xiong, Chaobo Huang
Plant grafting is a well-known activity in orchards, greenhouses and vineyards gardens. However, low survival rate still limits the promotion of grafting and breeding of improved varieties. We report on polymeric fibers, obtained through coaxial electrospun, as carriers for the sustained release of drugs to heal wounds in plants. The CA-PU co-electrospun fibers show a rather uniform diameter, a smooth and hydrophilic surface. As long as 10days of sustained drugs release meets with the physiological requirement of plant grafting...
August 1, 2017: Carbohydrate Polymers
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