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https://www.readbyqxmd.com/read/28324683/thermal-stress-impacts-reproductive-development-and-grain-yield-in-rice
#1
REVIEW
Muhammad Shakeel Arshad, Muhammad Farooq, Folkard Asch, Jagadish S V Krishna, P V Vara Prasad, Kadambot H M Siddique
Rice is highly sensitive to temperature stress (cold and heat), particularly during the reproductive and grain-filling stages. In this review, we discuss the effects of low- and high-temperature sensitivity in rice at various reproductive stages (from meiosis to grain development) and propose strategies for improving the tolerance of rice to terminal thermal stress. Cold stress impacts reproductive development through (i) delayed heading, due to its effect on anther respiration, which increases sucrose accumulation, protein denaturation and asparagine levels, and decreases proline accumulation, (ii) pollen sterility owing to tapetal hypertrophy and related nutrient imbalances, (iii) reduced activity of cell wall bound invertase in the tapetum of rice anthers, (iv) impaired fertilization due to inhibited anther dehiscence, stigma receptivity and ability of the pollen tube to germinate through the style towards the ovary, and (v) floret sterility, which increases grain abortion, restricts grain size, and thus reduces grain yield...
March 16, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28315162/dietary-supplementation-of-curcumin-augments-heat-stress-tolerance-through-upregulation-of-nrf-2-mediated-antioxidative-enzymes-and-hsps-in-puntius-sophore
#2
Arabinda Mahanty, Sasmita Mohanty, Bimal P Mohanty
Heat stress is one of the major environmental concerns in global warming regime and rising temperature has resulted in mass mortalities of animals including fishes. Therefore, strategies for high temperature stress tolerance and ameliorating the effects of heat stress are being looked for. In an earlier study, we reported that Nrf-2 (nuclear factor E2-related factor 2) mediated upregulation of antioxidative enzymes and heat shock proteins (Hsps) provide survivability to fish under heat stress. In this study, we have evaluated the ameliorative potential of dietary curcumin, a potential Nrf-2 inducer in heat stressed cyprinid Puntius sophore...
March 17, 2017: Fish Physiology and Biochemistry
https://www.readbyqxmd.com/read/28314795/unique-physiological-and-transcriptional-shifts-under-combinations-of-salinity-drought-and-heat
#3
Lidor Shaar-Moshe, Eduardo Blumwald, Zvi Peleg
Climate change-driven stresses such as extreme temperatures, water deficit, and ion imbalance are projected to exacerbate and jeopardize global food security. Under field conditions, these stresses usually occur simultaneously and cause damages that exceed single stresses. Here, we investigated the transcriptional patterns and morpho-physiological acclimations, of Brachypodium dystachion, to single salinity, drought and heat stresses as well as their double and triple stress combinations. Hierarchical clustering analysis of morpho-physiological acclimations showed that several traits exhibited a gradually aggravating effect as plants were exposed to combined stresses...
March 17, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28314727/transcriptomic-analyses-elucidate-adaptive-differences-of-closely-related-strains-of-p-aeruginosa-in-fuel
#4
Thusitha S Gunasekera, Loryn L Bowen, Carol E Zhou, Susan C Howard-Byerly, William S Foley, Richard C Striebich, Larry C Dugan, Oscar N Ruiz
Pseudomonas aeruginosa can utilize hydrocarbons, but different strains have varying degrees of adaptation despite their highly conserved genome. P. aeruginosa ATCC 33988 is highly adapted to hydrocarbons while strain PAO1, a human pathogen, is less-adapted and degrades jet fuel at a slower rate than does ATCC 33988. We investigated fuel specific transcriptomic differences between these strains in order to ascertain the underling mechanisms utilized by the adapted strain to proliferate in fuel. During growth in fuel, the genes related to alkane degradation, heat-shock response, membrane proteins, efflux pumps and several novel genes were upregulated in ATCC 33988...
March 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28303955/differential-proteomic-analysis-by-itraq-reveals-the-mechanism-of-pyropia-haitanensis-responding-to-high-temperature-stress
#5
Jianzhi Shi, Yuting Chen, Yan Xu, Dehua Ji, Changsheng Chen, Chaotian Xie
Global warming increases sea temperature and leads to high temperature stress, which affects the yield and quality of Pyropia haitanensis. To understand the molecular mechanisms underlying high temperature stress in a high temperature tolerance strain Z-61, the iTRAQ technique was employed to reveal the global proteomic response of Z-61 under different durations of high temperature stress. We identified 151 differentially expressed proteins and classified them into 11 functional categories. The 4 major categories of these are protein synthesis and degradation, photosynthesis, defense response, and energy and carbohydrate metabolism...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28301350/a-phase-ii-study-of-ganetespib-as-second-line-or-third-line-therapy-for-metastatic-pancreatic-cancer
#6
Dana B Cardin, Ramya Thota, Laura W Goff, Jordan D Berlin, Clyde M Jones, Gregory D Ayers, Jennifer G Whisenant, Emily Chan
OBJECTIVES: Heat shock protein 90 regulates multiple signaling proteins involved in key pathways of pancreatic cancer pathogenesis. Ganetespib binds to heat shock protein 90 and interferes with its binding to client proteins thus leading to inactivation and degradation of the signaling proteins that promote cancer progression. This phase II study was designed to evaluate the efficacy of ganetespib in patients with refractory metastatic pancreatic cancer (rMPC). METHODS: Patients with rMPC received 175 mg/m ganetespib intravenously once weekly for 3 weeks in 4-week cycles...
March 15, 2017: American Journal of Clinical Oncology
https://www.readbyqxmd.com/read/28300148/evolution-of-the-chitin-synthase-gene-family-correlates-with-fungal-morphogenesis-and-adaption-to-ecological-niches
#7
Ran Liu, Chuan Xu, Qiangqiang Zhang, Shiyi Wang, Weiguo Fang
The fungal kingdom potentially has the most complex chitin synthase (CHS) gene family, but evolution of the fungal CHS gene family and its diversification to fulfill multiple functions remain to be elucidated. Here, we identified the full complement of CHSs from 231 fungal species. Using the largest dataset to date, we characterized the evolution of the fungal CHS gene family using phylogenetic and domain structure analysis. Gene duplication, domain recombination and accretion are major mechanisms underlying the diversification of the fungal CHS gene family, producing at least 7 CHS classes...
March 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28299856/effects-of-a-short-term-supranutritional-selenium-supplementation-on-redox-balance-physiology-and-insulin-related-metabolism-in-heat-stressed-pigs
#8
F Liu, P Celi, J J Cottrell, S S Chauhan, B J Leury, F R Dunshea
Heat stress (HS) disrupts redox balance and insulin-related metabolism. Supplementation with supranutritional amounts of selenium (Se) may enhance glutathione peroxidase (GPX) activity and reduce oxidative stress, but may trigger insulin resistance. Therefore, the aim of this experiment was to investigate the effects of a short-term high Se supplementation on physiology, oxidative stress and insulin-related metabolism in heat-stressed pigs. Twenty-four gilts were fed either a control (0.20 ppm Se) or a high Se (1...
March 16, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/28298677/uvra-expression-of-lactococcus-lactis-nz9000-improve-multiple-stresses-tolerance-and-fermentation-of-lactic-acid-against-salt-stress
#9
Taher Khakpour Moghaddam, Juan Zhang, Guocheng Du
Lactococcus lactis is subjected to several stressful conditions during industrial fermentation including oxidation, heating and cooling, acid, high osmolarity/dehydration and starvation. DNA lesion is a major cause of genetic instability in L. lactis that usually occurs at a low frequency, but it is greatly enhanced by environmental stresses. DNA damages produced by these environmental stresses are thought to induce DNA double-strand breaks, leading to illegitimate recombination. Nucleotide excision repair (NER) protein UvrA suppresses multiple stresses-induced illegitimate recombination...
March 2017: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/28294575/variation-in-adult-stress-resistance-does-not-explain-vulnerability-to-climate-change-in-copper-butterflies
#10
Michael Klockmann, Leonard Wallmeyer, Klaus Fischer
Ongoing climate change is a major threat to biodiversity. However, although many species clearly suffer from ongoing climate change, others benefit from it e.g., by showing range expansions. However, which specific features determine a species' vulnerability to climate change? Phenotypic plasticity, which has been described as the first line of defence against environmental change, may be of utmost importance here. Against this background, we here compare plasticity in stress tolerance in three Copper butterfly species, which differ arguably in their vulnerability to climate change...
March 15, 2017: Insect Science
https://www.readbyqxmd.com/read/28293682/genome-sequence-of-the-thermotolerant-foodborne-pathogen-salmonella-enterica-serovar-senftenberg-atcc-43845-and-phylogenetic-analysis-of-loci-encoding-increased-protein-quality-control-mechanisms
#11
Scott V Nguyen, Gregory P Harhay, James L Bono, Timothy P L Smith, Dayna M Harhay
Salmonella enterica subsp. enterica bacteria are important foodborne pathogens with major economic impact. Some isolates exhibit increased heat tolerance, a concern for food safety. Analysis of a finished-quality genome sequence of an isolate commonly used in heat resistance studies, S. enterica subsp. enterica serovar Senftenberg 775W (ATCC 43845), demonstrated an interesting observation that this strain contains not just one, but two horizontally acquired thermotolerance locus homologs. These two loci reside on a large 341...
January 2017: MSystems
https://www.readbyqxmd.com/read/28283526/mechanisms-of-inactivation-of-dry-escherichia-coli-by-high-pressure-carbon-dioxide
#12
Yuan Yao Chen, Feral Temelli, Michael G Gänzle
High pressure carbon dioxide processing is a promising technology for non-thermal food preservation. However, few studies determined the lethality of high pressure CO2 on dry bacterial cells, and the mechanism of inactivation remains unknown. This study explored mechanisms of inactivation by using Escherichia coli AW1.7 and mutant strains differing in heat and acid resistance, and in membrane composition based on disruption of the locus of heat resistance, and genes coding for glutamate decarboxylases and cyclopropane fatty acid synthase, respectively...
March 10, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28283383/life-stages-of-an-aphid-living-under-similar-thermal-conditions-differ-in-thermal-performance
#13
Fei Zhao, Ary A Hoffmann, Kun Xing, Chun-Sen Ma
Heat responses can vary ontogenetically in many insects with complex life cycles, reflecting differences in thermal environments they experience. Such variation has rarely been considered in insects that develop incrementally and experience common microclimates across stages. To test if there is a low level of ontogenetic variation for heat responses in one such species, the English grain aphid Sitobion avenae, basal tolerance [upper lethal temperature (ULT50) and maximum critical temperature (CTmax)], hardening capacity (CTmax) and hardening costs (adult longevity and fecundity) were measured across five stages (1st, 2nd, 3rd and 4th-instar nymphs and newly moulted adults)...
March 8, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28283151/immunotherapy-for-food-allergy-are-we-there-yet
#14
Yael Gernez, Anna Nowak-Węgrzyn
Current clinical research focuses on food allergen-specific immunotherapy through oral (OIT), sublingual (SLIT), or epicutaneous (EPIT) routes. Immunotherapy relies on the delivery of gradually increasing doses of specific allergens to induce desensitization (defined as temporary antigen hyporesponsiveness that depends on regular food ingestion) and, ultimately, tolerance (defined as the ability to ingest food without symptoms despite prolonged periods of avoidance or irregular intake). Although the majority of the patients treated with OIT achieve desensitization, only a minority achieves tolerance...
March 2017: Journal of Allergy and Clinical Immunology in Practice
https://www.readbyqxmd.com/read/28282618/integrating-multiple-stressors-across-life-stages-and-latitudes-combined-and-delayed-effects-of-an-egg-heat-wave-and-larval-pesticide-exposure-in-a-damselfly
#15
Szymon Sniegula, Lizanne Janssens, Robby Stoks
To understand the effects of pollutants in a changing world we need multistressor studies that combine pollutants with other stressors associated with global change such as heat waves. We tested for the delayed and combined impact of a heat wave during the egg stage and subsequent sublethal exposure to the pesticide esfenvalerate during the larval stage on life history and physiology in the larval and adult stage of the damselfly Lestes sponsa. We studied this in a common garden experiment with replicated central- and high latitude populations to explore potential effects of local thermal adaptation and differences in life history shaping the multistressor responses...
March 1, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28282395/bacillus-aryabhattai-srb02-tolerates-oxidative-and-nitrosative-stress-and-promotes-the-growth-of-soybean-by-modulating-the-production-of-phytohormones
#16
Yeon-Gyeong Park, Bong-Gyu Mun, Sang-Mo Kang, Adil Hussain, Raheem Shahzad, Chang-Woo Seo, Ah-Yeong Kim, Sang-Uk Lee, Kyeong Yeol Oh, Dong Yeol Lee, In-Jung Lee, Byung-Wook Yun
Plant growth promoting rhizobacteria (PGPR) are diverse, naturally occurring bacteria that establish a close association with plant roots and promote the growth and immunity of plants. Established mechanisms involved in PGPR-mediated plant growth promotion include regulation of phytohormones, improved nutrient availability, and antagonistic effects on plant pathogens. In this study, we isolated a bacterium from the rhizospheric soil of a soybean field in Chungcheong buk-do, South Korea. Using 16S rRNA sequencing, the bacterium was identified as Bacillus aryabhattai strain SRB02...
2017: PloS One
https://www.readbyqxmd.com/read/28282260/production-optimization-of-a-heat-tolerant-alkaline-pectinase-from-bacillus-subtilis-zgl14-and-its-purification-and-characterization
#17
Ping Yu, Yishu Zhang, Donglu Gu
Alkaline pectinase has important applications in the pretreatment of waste water from food processing and in both the fabric and paper industries. In this study, a 2-level factorial design was used to screen significant factors that affect the activity of alkaline pectinase, and the response surface methodology (RSM) with a Box-Behnken design (BBD) was used to optimize their concentrations. Starch, peptone, KH2PO4 and K2HPO4·3H2O were found to significantly affect the activity of alkaline pectinase. Their optimal concentrations were as follows: 4...
February 16, 2017: Bioengineered
https://www.readbyqxmd.com/read/28274939/long-term-hif-1%C3%AE-transcriptional-activation-is-essential-for-heat-acclimation-mediated-cross-tolerance-mitochondrial-target-genes
#18
Rivka Alexander-Shani, Ahmad Mreisat, Elia Smeir, Gary Gerstenblith, Michael D Stern, Michal Horowitz
An important adaptive feature of heat acclimation (AC) is the induction of cross-tolerance against novel stressors (HACT). Reprogramming of gene expression leading to enhanced innate cytoprotective features by attenuating damage and/or enhancing the response of "help" signals, plays a pivotal role. HIF-1α, constitutively upregulated by AC (1mo, 34°C), is a crucial transcription factor in this program, although its specific role is as yet unknown. By using a rat AC model we studied the impact of disrupting HIF-1α transcriptional activation [(HIF-1α:HIF-1β dimerization blockade by Acriflavine (4mg/kg b...
March 8, 2017: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/28273933/anodal-transcranial-direct-current-stimulation-over-the-left-dorsolateral-prefrontal-cortex-modulates-attention-and-pain-in-fibromyalgia-randomized-clinical-trial
#19
Adriana Ferreira Silva, Maxciel Zortea, Sandra Carvalho, Jorge Leite, Iraci Lucena da Silva Torres, Felipe Fregni, Wolnei Caumo
Cognitive dysfunction in fibromyalgia patients has been reported, especially when increased attentional demands are required. Transcranial direct current stimulation (tDCS) over the dorsolateral prefrontal cortex (DLPFC) has been effective in modulating attention. We tested the effects of a single session of tDCS coupled with a Go/No-go task in modulating three distinct attentional networks: alertness, orienting and executive control. Secondarily, the effect on pain measures was evaluated. Forty females with fibromyalgia were randomized to receive active or sham tDCS...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28273392/surfing-parameter-hyperspaces-under-climate-change-scenarios-to-design-future-rice-ideotypes
#20
Livia Paleari, Ermes Movedi, Giovanni Cappelli, Lloyd T Wilson, Roberto Confalonieri
Growing food crops to meet global demand and the search for more sustainable cropping systems are increasing the need for new cultivars in key production areas. This study presents the identification of rice traits putatively producing the largest yield benefits in five areas that markedly differ in terms of environmental conditions in the Philippines, India, China, Japan and Italy. The ecophysiological model WARM and sensitivity analysis techniques were used to evaluate phenotypic traits involved with light interception, photosynthetic efficiency, tolerance to abiotic stressors, resistance to fungal pathogens and grain quality...
March 8, 2017: Global Change Biology
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