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https://www.readbyqxmd.com/read/29456547/evolutionary-origin-gradual-accumulation-and-functional-divergence-of-heat-shock-factor-gene-family-with-plant-evolution
#1
Xiaoming Wang, Xue Shi, Siyuan Chen, Chuang Ma, Shengbao Xu
Plants, as sessile organisms, evolved a complex and functionally diverse heat shock factor (HSF) gene family to cope with various environmental stresses. However, the limited evolution studies of the HSF gene family have hindered our understanding of environmental adaptations in plants. In this study, a comprehensive evolution analysis on the HSF gene family was performed in 51 representative plant species. Our results demonstrated that the HSFB group which lacks a typical AHA activation domain, was the most ancient, and is under stronger purifying selection pressure in the subsequent evolutionary processes...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29450758/overexpression-of-altmp2-gene-from-the-halophyte-grass-aeluropus-littoralis-in-transgenic-tobacco-enhances-tolerance-to-different-abiotic-stresses-by-improving-membrane-stability-and-deregulating-some-stress-related-genes
#2
Walid Ben-Romdhane, Rania Ben-Saad, Donaldo Meynard, Nabil Zouari, Ali Mahjoub, Lotfi Fki, Emmanuel Guiderdoni, Abdullah Al-Doss, Afif Hassairi
Herein, we report isolation of the AlTMP2 gene from the halophytic C4 grass Aeluropus littoralis. The subcellular localization suggested that AlTMP2 is a plasma membrane protein. In A. littoralis exposed to salt and osmotic stresses, the AlTMP2 gene was induced early and at a high rate, but was upregulated relatively later in response to abscisic acid and cold treatments. Expression of AlTMP2 in tobacco conferred improved tolerance against salinity, osmotic, H 2 O 2 , heat, and freezing stresses at the germination and seedling stages...
February 15, 2018: Protoplasma
https://www.readbyqxmd.com/read/29449855/microrna160-modulates-plant-development-and-heat-shock-protein-gene-expression-to-mediate-heat-tolerance-in-arabidopsis
#3
Jeng-Shane Lin, Chia-Chia Kuo, I-Chu Yang, Wei-An Tsai, Yu-Hsing Shen, Chih-Ching Lin, Yi-Chen Liang, Yu-Chi Li, Yun-Wei Kuo, Yu-Chi King, Hsi-Mei Lai, Shih-Tong Jeng
Global warming is causing a negative impact on plant growth and adversely impacts on crop yield. MicroRNAs (miRNAs) are critical in regulating the expression of genes involved in plant development as well as defense responses. The effects of miRNAs on heat-stressed Arabidopsis warrants further investigation. Heat stress increased the expression of miR160 and its precursors but considerably reduced that of its targets, ARF10, ARF16 , and ARF17 . To study the roles of miR160 during heat stress, transgenic Arabidopsis plants overexpressing miR160 precursor a (160OE) and artificial miR160 (MIM160), which mimics an inhibitor of miR160, were created...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29444814/plastid-translation-elongation-factor-tu-is-prone-to-heat-induced-aggregation-despite-its-critical-role-in-plant-heat-tolerance
#4
Xifeng Li, Chong Cai, Zhe Wang, Baofang Fan, Cheng Zhu, Zhixiang Chen
Translation elongation factor Tu (EF-Tu) is a conserved GTP-binding protein essential for protein translation in prokaryotes and eukaryotic organelles of mitochondria and plastids. EF-Tu also has a GTP/GDP-independent chaperone activity implicated in heat adaptation. Here, we report that Arabidopsis plastid EF-Tu, Rabe1b, rapidly became insoluble in vitro at a temperature as low as 35{degree sign}, but remained largely soluble in vivo at the elevated temperature. At a temperature above 41{degree sign}C, insolubilization of Rabe1b also occurred in vivo, with more than 90% becoming aggregated in 9 hours at 45{degree sign}C...
February 14, 2018: Plant Physiology
https://www.readbyqxmd.com/read/29444421/chloroplast-signaling-gates-thermotolerance-in-arabidopsis
#5
Patrick J Dickinson, Manoj Kumar, Claudia Martinho, Seong Jeon Yoo, Hui Lan, George Artavanis, Varodom Charoensawan, Mark Aurel Schöttler, Ralph Bock, Katja E Jaeger, Philip A Wigge
Temperature is a key environmental variable influencing plant growth and survival. Protection against high temperature stress in eukaryotes is coordinated by heat shock factors (HSFs), transcription factors that activate the expression of protective chaperones such as HEAT SHOCK PROTEIN 70 (HSP70); however, the pathway by which temperature is sensed and integrated with other environmental signals into adaptive responses is not well understood. Plants are exposed to considerable diurnal variation in temperature, and we have found that there is diurnal variation in thermotolerance in Arabidopsis thaliana, with maximal thermotolerance coinciding with higher HSP70 expression during the day...
February 13, 2018: Cell Reports
https://www.readbyqxmd.com/read/29437392/thermostability-of-the-pyl-pp2c-heterodimer-is-dependent-on-magnesium-in-silico-insights-into-the-link-between-heat-stress-response-and-magnesium-deficiency-in-plants
#6
Emel Timucin, Osman Ugur Sezerman
Magnesium deficiency increases susceptibility of plants towards heat stress. The correlation between magnesium levels and stress response has been studied at the physiological level, albeit the molecular explanation to this relationship remains elusive. Among diverse pathways implicated in the heat stress, the abscisic acid (ABA) signal modulates the heat stress response by magnesium dependent phosphatases (PP2Cs). Exclusively, sequestration of PP2Cs by ABA receptors (PYLs) in the heterodimer form activates the stress response through ABA responsive transcription factors...
February 13, 2018: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/29420735/12-oxo-phytodienoic-acid-enhances-wheat-resistance-to-hessian-fly-diptera-cecidomyiidae-under-heat-stress
#7
Ge Cheng, Ming-Shun Chen, Lieceng Zhu
12-Oxo-phytodienoic acid (OPDA) plays unique roles in plant defenses against biotic and abiotic stresses. In the current study, we infested two resistant wheat (Triticum aestivum L.) cultivars, 'Molly' and 'Iris', with an avirulent Hessian fly population and determined the impact of exogenous OPDA application on wheat resistance to the insect under heat stress. We observed that Molly and Iris treated with OPDA solution prior to the heat treatment exhibited significantly enhanced insect resistance. We also measured OPDA concentrations at Hessian fly feeding sites in Molly infested with Hessian flies...
February 6, 2018: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29417346/transcript-profiling-and-gene-expression-analysis-under-drought-stress-in-ziziphus-nummularia-burm-f-wright-arn
#8
Radha Yadav, Om Prakash Verma, Jasdeep Chatrath Padaria
Drought is one of the prime abiotic stresses responsible for limiting agricultural productivity. A number of drought responsive genes have been isolated and functionally characterized but these studies have been restricted to a few model plant systems. Very few drought responsive genes have been reported till date from non model drought tolerant plants. The present study aimed at identifying differentially expressed genes from a drought tolerant, non-model plant, Ziziphus nummularia (Burm.f.) Wight & Arn. One month old seedlings of Z...
February 7, 2018: Molecular Biology Reports
https://www.readbyqxmd.com/read/29416051/a-novel-gene-of-kalanchoe-daigremontiana-confers-plant-drought-resistance
#9
Li Wang, Chen Zhu, Lin Jin, Aihua Xiao, Jie Duan, Luyi Ma
Kalanchoe (K.) daigremontiana is important for studying asexual reproduction under different environmental conditions. Here, we describe a novel KdNOVEL41 (KdN41) gene that may confer drought resistance and could thereby affect K. daigremontiana development. The detected subcellular localization of a KdN41/Yellow Fluorescent Protein (YFP) fusion protein was in the nucleus and cell membrane. Drought, salt, and heat stress treatment in tobacco plants containing the KdN41 gene promoter driving β-glucuronidase (GUS) gene transcription revealed that only drought stress triggered strong GUS staining in the vascular tissues...
February 7, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29411100/role-of-peroxynitrite-in-the-responses-induced-by-heat-stress-in-tobacco-by-2-cultured-cells
#10
Massimo Malerba, Raffaella Cerana
Temperatures above the optimum are sensed as heat stress (HS) by all living organisms and represent one of the major environmental challenges for plants. Plants can cope with HS by activating specific defense mechanisms to minimize damage and ensure cellular functionality. One of the most common effects of HS is the overproduction of reactive oxygen and nitrogen species (ROS and RNS). The role of ROS and RNS in the regulation of many plant physiological processes is well established. On the contrary, in plants very little is known about the physiological role of peroxynitrite (ONOO-), the RNS species generated by the interaction between NO and O2-...
February 6, 2018: Protoplasma
https://www.readbyqxmd.com/read/29401742/induced-salt-tolerance-of-perennial-ryegrass-by-a-novel-bacterium-strain-from-the-rhizosphere-of-a-desert-shrub-haloxylon-ammodendron
#11
Ao-Lei He, Shu-Qi Niu, Qi Zhao, Yong-Sheng Li, Jing-Yi Gou, Hui-Juan Gao, Sheng-Zhou Suo, Jin-Lin Zhang
Drought and soil salinity reduce agricultural output worldwide. Plant-growth-promoting rhizobacteria (PGPR) can enhance plant growth and augment plant tolerance to biotic and abiotic stresses. Haloxylon ammodendron, a C4 perennial succulent xerohalophyte shrub with excellent drought and salt tolerance, is naturally distributed in the desert area of northwest China. In our previous work, a bacterium strain numbered as M30-35 was isolated from the rhizosphere of H. ammodendron in Tengger desert, Gansu province, northwest China...
February 5, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29396465/the-rolb-plant-oncogene-affects-multiple-signaling-protein-modules-related-to-hormone-signaling-and-plant-defense
#12
Victor P Bulgakov, Yulia V Vereshchagina, Dmitry V Bulgakov, Galina N Veremeichik, Yuri N Shkryl
The rolB plant oncogene of Agrobacterium rhizogenes perturbs many biochemical processes in transformed plant cells, thereby causing their neoplastic reprogramming. The oncogene renders the cells more tolerant to environmental stresses and herbicides and inhibits ROS elevation and programmed cell death. In the present work, we performed a proteomic analysis of Arabidopsis thaliana rolB-expressing callus line AtB-2, which represents a line with moderate expression of the oncogene. Our results show that under these conditions rolB greatly perturbs the expression of some chaperone-type proteins such as heat-shock proteins and cyclophilins...
February 2, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29394377/overexpression-of-two-novel-hsfa3s-from-lily-in-arabidopsis-confer-increased-thermotolerance-and-salt-sensitivity-via-alterations-in-proline-catabolism
#13
Ze Wu, Jiahui Liang, Chengpeng Wang, Xin Zhao, Xionghui Zhong, Xing Cao, Guoqing Li, Junna He, Mingfang Yi
Although HsfA3 (heat stress transcription factor A3) is well characterized in heat stress, its roles in other abiotic stresses are less clear. Here, we isolated two homologous HsfA3 genes, LlHsfA3A and LlHsfA3B, from lily (Lilium longiflorum). Both genes were induced by heat stress, but not salt stress. Overexpressing LlHsfA3A in Arabidopsis enhanced its basal and acquired thermotolerance, while overexpressing LlHsfA3B just enhanced its acquired thermotolerance. However, both overexpressed plants showed hypersensitivity to salt stress, and a lack of sucrose exacerbated this salt sensitivity...
January 31, 2018: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29391403/the-membrane-tethered-transcription-factor-ecbzip17-from-finger-millet-promotes-plant-growth-and-enhances-tolerance-to-abiotic-stresses
#14
Chopperla Ramakrishna, Sonam Singh, Sangala Raghavendrarao, Jasdeep C Padaria, Sasmita Mohanty, Tilak Raj Sharma, Amolkumar U Solanke
The occurrence of various stresses, as the outcome of global climate change, results in the yield losses of crop plants. Prospecting of genes in stress tolerant plant species may help to protect and improve their agronomic performance. Finger millet (Eleusine coracana L.) is a valuable source of superior genes and alleles for stress tolerance. In this study, we isolated a novel endoplasmic reticulum (ER) membrane tethered bZIP transcription factor from finger millet, EcbZIP17. Transgenic tobacco plants overexpressing this gene showed better vegetative growth and seed yield compared with wild type (WT) plants under optimal growth conditions and confirmed upregulation of brassinosteroid signalling genes...
February 1, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29385615/orange-a-target-gene-for-regulating-carotenoid-homeostasis-and-increasing-plant-tolerance-to-environmental-stress-in-marginal-lands
#15
Ho Soo Kim, Chang Yoon Ji, Chan-Ju Lee, So-Eun Kim, Sung-Chul Park, Sang-Soo Kwak
Carotenoids play essential roles in various light-harvesting processes in plants and help protect the photosynthetic machinery from photo-oxidative damage. Orange genes, which play a role in carotenoid accumulation, were recently isolated from several plant species, and their functions were intensively investigated. The Orange gene (IbOr) from sweetpotato [Ipomoea batatas (L.) Lam] helps maintain carotenoid homeostasis to improve plant tolerance to environmental stress. IbOr, a protein with strong holdase chaperone activity, directly interacts with phytoene synthase (IbPSY), a key enzyme involved in carotenoid biosynthesis, in plants under stress conditions, resulting in increased carotenoid accumulation and abiotic stress tolerance...
January 27, 2018: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29381447/stabilized1-as-a-heat-stress-specific-splicing-factor-in-arabidopsis-thaliana
#16
Geun-Don Kim, Sang-Dong Yoo, Young-Hee Cho
To overcome high temperature stress, plants have developed transcriptional cascades which express a large amount of chaperone proteins called heat shock proteins (HSPs). In our recent publication, we reported that STABILIZED1, as an U5-snRNP-interacting protein, is involved in the splicing of heat shock factor (HSF) and HSP transcripts during high temperature stress. This indicates that not only transcriptional regulation, but also post-transcriptional regulation by STA1, is essential for the full activation of HSF-HSP cascades and for thermotolerance...
January 30, 2018: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/29375977/climate-dependent-heat-triggered-opening-mechanism-of-banksia-seed-pods
#17
Jessica C Huss, Vanessa Schoeppler, David J Merritt, Christine Best, Eric Maire, Jérôme Adrien, Oliver Spaeker, Nils Janssen, Johannes Gladisch, Notburga Gierlinger, Ben P Miller, Peter Fratzl, Michaela Eder
Heat-triggered fruit opening and delayed release of mature seeds are widespread among plants in fire-prone ecosystems. Here, the material characteristics of the seed-containing follicles of Banksia attenuata (Proteaceae), which open in response to heat frequently caused by fire, are investigated. Material analysis reveals that long-term dimensional stability and opening temperatures of follicles collected across an environmental gradient increase as habitats become drier, hotter, and more fire prone. A gradual increase in the biaxial curvature of the hygroscopic valves provides the follicles in the driest region with the highest flexural rigidity...
January 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29372429/exploring-traditional-aus-type-rice-for-metabolites-conferring-drought-tolerance
#18
Alberto Casartelli, David Riewe, Hans Michael Hubberten, Thomas Altmann, Rainer Hoefgen, Sigrid Heuer
BACKGROUND: Traditional varieties and landraces belonging to the aus-type group of rice (Oryza sativa L.) are known to be highly tolerant to environmental stresses, such as drought and heat, and are therefore recognized as a valuable genetic resource for crop improvement. Using two aus-type (Dular, N22) and two drought intolerant irrigated varieties (IR64, IR74) an untargeted metabolomics analysis was conducted to identify drought-responsive metabolites associated with tolerance. RESULTS: The superior drought tolerance of Dular and N22 compared with the irrigated varieties was confirmed by phenotyping plants grown to maturity after imposing severe drought stress in a dry-down treatment...
January 25, 2018: Rice
https://www.readbyqxmd.com/read/29368016/differential-proteomic-analysis-reveals-sequential-heat-stress-responsive-regulatory-network-in-radish-raphanus-sativus-l-taproot
#19
Ronghua Wang, Yi Mei, Liang Xu, Xianwen Zhu, Yan Wang, Jun Guo, Liwang Liu
Differential abundance protein species (DAPS) involved in reducing damage and enhancing thermotolerance in radish were firstly identified. Proteomic analysis and omics association analysis revealed a HS-responsive regulatory network in radish. Heat stress (HS) is a major destructive factor influencing radish production and supply in summer, for radish is a cool season vegetable crop being susceptible to high temperature. In this study, the proteome changes of radish taproots under 40 °C treatment at 0 h (Control), 12 h (Heat12) and 24 h (Heat24) were analyzed using iTRAQ (Isobaric Tag for Relative and Absolute Quantification) approach...
January 24, 2018: Planta
https://www.readbyqxmd.com/read/29362095/the-newly-identified-heat-stress-sensitive-albino-1-gene-affects-chloroplast-development-in-rice
#20
Zhennan Qiu, Shujing Kang, Lei He, Juan Zhao, Sen Zhang, Jiang Hu, Dali Zeng, Guangheng Zhang, Guojun Dong, Zhenyu Gao, Deyong Ren, Guang Chen, Longbiao Guo, Qian Qian, Li Zhu
High temperature, a major abiotic stress, significantly affects the yield and quality of crops in many parts of the world. Components of the photosynthetic apparatus are highly susceptible to thermal damage. Although the responses to acute heat stress have been studied intensively, the mechanisms that regulate chloroplast development under heat stress remain obscure, especially in crop plants. Here, we cloned and characterized the gene responsible for the heat-sensitive albino1 (hsa1) mutation in rice (Oryza sativa)...
February 2018: Plant Science: An International Journal of Experimental Plant Biology
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