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abiotic stress

Luis Figueroa-Yañez, Alejandro Pereira-Santana, Ana Arroyo-Herrera, Ulises Rodriguez-Corona, Felipe Sanchez-Teyer, Jorge Espadas-Alcocer, Francisco Espadas-Gil, Felipe Barredo-Pool, Enrique Castaño, Luis Carlos Rodriguez-Zapata
Plants respond to stress through metabolic and morphological changes that increase their ability to survive and grow. To this end, several transcription factor families are responsible for transmitting the signals that are required for these changes. Here, we studied the transcription factor superfamily AP2/ERF, particularly, RAP2.4 from Carica papaya cv. Maradol. We isolated four genes (CpRap2.4a, CpRAap2.4b, CpRap2.1 and CpRap2.10), and an in silico analysis showed that the four genes encode proteins that contain a conserved APETALA2 (AP2) domain located within group I and II transcription factors of the AP2/ERF superfamily...
2016: PloS One
Siavash Isazadeh, Shameem Jauffur, Dominic Frigon
Effect of ecological variables on community assembly of heterotrophic bacteria at eight full-scale and two pilot-scale activated sludge wastewater treatment plants (AS-WWTPs) were explored by pyrosequencing of 16S rRNA gene amplicons. In total, 39 samples covering a range of abiotic factors spread over space and time were analyzed. A core bacterial community of 24 families detected in at least six of the eight AS-WWTPs was defined. In addition to the core families, plant-specific families (observed at <50% AS-WWTPs) were found to be also important in the community structure...
October 19, 2016: MicrobiologyOpen
Sara Branco, Ke Bi, Hui-Ling Liao, Pierre Gladieux, Hélène Badouin, Christopher E Ellison, Nhu H Nguyen, Rytas Vilgalys, Kabir G Peay, John W Taylor, Thomas D Bruns
Recent advancements in sequencing technology allowed researchers to better address the patterns and mechanisms involved in microbial environmental adaptation at large spatial scales. Here we investigated the genomic basis of adaptation to climate at the continental scale in Suillus brevipes, an ectomycorrhizal fungus symbiotically associated with the roots of pine trees. We used genomic data from 55 individuals in seven locations across North America to perform genome scans to detect signatures of positive selection and assess whether temperature and precipitation were associated with genetic differentiation...
October 20, 2016: Molecular Ecology
Ulrike Glaubitz, Xia Li, Sandra Schaedel, Alexander Erban, Ronan Sulpice, Joachim Kopka, Dirk K Hincha, Ellen Zuther
Transcript and metabolite profiling were performed on leaves from six rice cultivars under high night temperature (HNT) condition. Six genes were identified as central for HNT response encoding proteins involved in transcription regulation, signal transduction, protein-protein interactions, jasmonate response, and the biosynthesis of secondary metabolites. Sensitive cultivars showed specific changes in transcript abundance including abiotic stress responses, changes of cell wall related genes, of ABA signaling and secondary metabolism...
October 20, 2016: Plant, Cell & Environment
Martin Jopcik, Jana Moravcikova, Ildiko Matusikova, Miroslav Bauer, Miroslav Rajninec, Jana Libantova
Chitinase gene from the carnivorous plant, Drosera rotundifolia , was cloned and functionally characterised. Plant chitinases are believed to play an important role in the developmental and physiological processes and in responses to biotic and abiotic stress. In addition, there is growing evidence that carnivorous plants can use them to digest insect prey. In this study, a full-length genomic clone consisting of the 1665-bp chitinase gene (gDrChit) and adjacent promoter region of the 698 bp in length were isolated from Drosera rotundifolia L...
October 19, 2016: Planta
Jianbo Li, Huixia Jia, Xiaojiao Han, Jin Zhang, Pei Sun, Mengzhu Lu, Jianjun Hu
Salix psammophila is a desert shrub willow that has extraordinary adaptation to abiotic stresses and plays an important role in maintaining local ecosystems. Moreover, S. psammophila is regarded as a promising biomass feedstock because of its high biomass yields and short rotation coppice cycle. However, few suitable reference genes (RGs) for quantitative real-time polymerase chain reaction (qRT-PCR) constrain the study on normalization of gene expression in S. psammophila until now. Here, we investigated the expression stabilities of 14 candidate RGs across tissue types and under four abiotic stress treatments, including heat, cold, salt, and drought treatments...
2016: Frontiers in Plant Science
Hai Du, Feng Ran, Hong-Li Dong, Jing Wen, Jia-Na Li, Zhe Liang
Cytochrome P450 93 family (CYP93) belonging to the cytochrome P450 superfamily plays important roles in diverse plant processes. However, no previous studies have investigated the evolution and expression of the members of this family. In this study, we performed comprehensive genome-wide analysis to identify CYP93 genes in 60 green plants. In all, 214 CYP93 proteins were identified; they were specifically found in flowering plants and could be classified into ten subfamilies-CYP93A-K, with the last two being identified first...
2016: PloS One
Lucas J Albano, Sheila M Macfie
A typical plant response to any biotic or abiotic stress, including cadmium (Cd), involves increased ethylene synthesis, which causes senescence of the affected plant part. Stressed plants can experience reduced ethylene and improved growth if they are inoculated with bacteria that have the enzyme ACC deaminase, which metabolizes the ethylene precursor ACC (1-aminocyclopropane-1-carboxylate). We investigated whether one such bacterium, Pseudomonas fluorescens UW4, reduces the production of ethylene and improves the growth of lettuce (Lactuca sativa) sown in Cd-contaminated potting material (PRO-MIX® BX)...
July 22, 2016: Canadian Journal of Microbiology
Stefano Papazian, Eliezer Khaling, Christelle Bonnet, Steve Lassueur, Philippe Reymond, Thomas Moritz, James Blande, Benedicte Riber Albrectsen
Plants have evolved adaptive mechanisms that allow them to tolerate a continuous range of abiotic and biotic stressors. Tropospheric ozone (O3), a global anthropogenic pollutant, directly affects living organisms and ecosystems, including plant-herbivore interactions. In this study, we investigate the stress responses of wild black mustard (Brassica nigra) exposed consecutively to O3 and the specialist herbivore Pieris brassicae. Transcriptomics and metabolomics data were evaluated using multivariate, correlation, and network analyses for the O3 and herbivory responses...
October 6, 2016: Plant Physiology
Catherine Duport, Michel Jobin, Philippe Schmitt
Bacillus cereus is a food-borne pathogen that causes diarrheal disease in humans. After ingestion, B. cereus experiences in the human gastro-intestinal tract abiotic physical variables encountered in food, such as acidic pH in the stomach and changing oxygen conditions in the human intestine. B. cereus responds to environmental changing conditions (stress) by reversibly adjusting its physiology to maximize resource utilization while maintaining structural and genetic integrity by repairing and minimizing damage to cellular infrastructure...
2016: Frontiers in Microbiology
Cameron S Gordon, Nandhakishore Rajagopalan, Eddy P Risseeuw, Marci Surpin, Fraser J Ball, Carla J Barber, Leann M Buhrow, Shawn M Clark, Jonathan E Page, Chris D Todd, Suzanne R Abrams, Michele C Loewen
Abscisic acid (ABA) is a well-characterized plant hormone, known to mediate developmental aspects as well as both abiotic and biotic stress responses. Notably, the exogenous application of ABA has recently been shown to increase susceptibility to the fungal pathogen Fusarium graminearum, the causative agent of Fusarium head blight (FHB) in wheat and other cereals. However roles and mechanisms associated with ABA's modulation of pathogen responses remain enigmatic. Here the identification of putative ABA receptors from available genomic databases for Triticum aestivum (bread wheat) and Brachypodium distachyon (a model cereal) are reported...
2016: PloS One
Ji-Hua Yu, Yang-Yang Li, Mian Xiang, Jian-Quan Zhu, Xin-He Huang, Wan-Jun Wang, Rui Tan, Jia-Yu Zhou, Hai Liao
OBJECTIVES: To clone and characterize a novel bi-functional α-amylase/subtilisin inhibitor (LASI) from the rhizome of Ligusticum chuanxiong, a traditional Chinese medicine. RESULTS: The LASI showed strong homology with members of the Kunitz trypsin inhibitor family. Its putative amino acid sequence has a 40 % identity with that of the α-amylase/subtilisin inhibitor from rice. LASI gene without signal peptide was expressed in E. coli Rosetta. After purification, the recombinant LASI protein was inhibitory against not only α-amylase from porcine pancreas, Helicoverpa armigera, Spodoptera litura and Plutella xylostella, but also subtilisin A, but not against trypsin or chymotrypsin...
October 17, 2016: Biotechnology Letters
Antonio López-Orenes, María C Bueso, Héctor M Conesa, Antonio A Calderón, María A Ferrer
Soil pollution by heavy metals/metalloids (HMMs) is a problem worldwide. To prevent dispersion of contaminated particles by erosion, the maintenance of a vegetative cover is needed. Successful plant establishment in multi-polluted soils can be hampered not only by HMM toxicities, but also by soil nutrient deficiencies and the co-occurrence of abiotic stresses. Some plant species are able to thrive under these multi-stress scenarios often linked to marked fluctuations in environmental factors. This study aimed to investigate the metabolic adjustments involved in Zygophyllum fabago acclimative responses to conditions prevailing in HMM-enriched mine-tailings piles, during Mediterranean spring and summer...
October 14, 2016: Science of the Total Environment
Jiang Zhu, Wen-Shu Wang, Dan Ma, Lin-Yu Zhang, Feng Ren, Ting-Ting Yuan
Protein kinase CK2, which consists of two α and two β subunits, plays an essential role in plant development and is implicated in plant responses to abiotic stresses, including salt and heat. However, the function of CK2 in response to heavy metals such as cadmium (Cd) has not yet been established. In this study, the transgenic line CKB4ox, which overexpresses CKB4 encoding the CK2β subunit and has elevated CK2 activity, was used to investigate the potential role of CK2 in response to Cd stress in Arabidopsis thaliana...
October 8, 2016: Plant Physiology and Biochemistry: PPB
Lin-Lin Yuan, Ming Zhang, Xing Yan, Yan-Wei Bian, Shou-Min Zhen, Yue-Ming Yan
Drought stress is a major abiotic stress affecting plant growth and development. In this study, we performed the first dynamic phosphoproteome analysis of Brachypodium distachyon L. seedling leaves under drought stress for different times. A total of 4924 phosphopeptides, contained 6362 phosphosites belonging to 2748 phosphoproteins. Rigorous standards were imposed to screen 484 phosphorylation sites, representing 442 unique phosphoproteins. Comparative analyses revealed significant changes in phosphorylation levels at 0, 6, and 24 h under drought stress...
October 17, 2016: Scientific Reports
Pan Li, Yan-Jie Li, Bo Wang, Hui-Min Yu, Qin Li, Bing-Kai Hou
Glycosyltransferase (GT) family-1, the biggest GT family in plants, typically participates in modification of small molecules and affects many aspects during plant development. In Arabidopsis thaliana, although some UDP glycosyltransferases (UGTs) of family-1 have been functionally characterized, functions of most UGTs remain unknown or fragmentary. Here, we report data for the arabidopsis UGT87A2, a stress-regulated glycosyltransferase. We found that UGT87A2 could be dramatically induced by salinity, osmotic stress, drought and ABA...
October 17, 2016: Physiologia Plantarum
Vivek Ambastha, Sudhir K Sopory, Budhi Sagar Tiwari, Baishnab C Tripathy
In this paper we provide evidence for involvement of chloroplast as alternate organelle for initiating PCD in plants under light and abiotic stress. In animals, mitochondria are the major source of reactive oxygen species (ROS) and key executioner of programmed cell death (PCD). In plants, however, the primary site of generation of ROS is chloroplast and yet its involvement in PCD has not been worked out in details. We found by Evans blue staining that salt (150 mM NaCl)-treated protoplasts obtained from green seedlings had higher rate of cell death than protoplasts obtained from etiolated seedlings...
October 17, 2016: Apoptosis: An International Journal on Programmed Cell Death
Carolyn R Schaeffer, Tra-My N Hoang, Craig M Sudbeck, Malik Alawi, Isaiah E Tolo, D Ashley Robinson, Alexander R Horswill, Holger Rohde, Paul D Fey
Staphylococcus epidermidis is a leading cause of hospital-associated infections, including those of intravascular catheters, cerebrospinal fluid shunts, and orthopedic implants. Multiple biofilm matrix molecules with heterogeneous characteristics have been identified, including proteinaceous, polysaccharide, and nucleic acid factors. Two of the best-studied components in S. epidermidis include accumulation-associated protein (Aap) and polysaccharide intercellular adhesin (PIA), produced by the enzymatic products of the icaADBC operon...
September 2016: MSphere
Meng-Yao Li, Xiong Song, Feng Wang, Ai-Sheng Xiong
Parsley, one of the most important vegetables in the Apiaceae family, is widely used in the food, medicinal, and cosmetic industries. Recent studies on parsley mainly focus on its chemical composition, and further research involving the analysis of the plant's gene functions and expressions is required. qPCR is a powerful method for detecting very low quantities of target transcript levels and is widely used to study gene expression. To ensure the accuracy of results, a suitable reference gene is necessary for expression normalization...
2016: Frontiers in Plant Science
Lalit Agrawal, Swati Gupta, Shashank K Mishra, Garima Pandey, Susheel Kumar, Puneet S Chauhan, Debasis Chakrabarty, Chandra S Nautiyal
Along with many adaptive strategies, dynamic changes in protein abundance seem to be the common strategy to cope up with abiotic stresses which can be best explored through proteomics. Understanding of drought response is the key to decipher regulatory mechanism of better adaptation. Rice (Oryza sativa L.) proteome represents a phenomenal source of proteins that govern traits of agronomic importance, such as drought tolerance. In this study, a comparison of root cytoplasmic proteome was done for a drought tolerant rice (Heena) cultivar in PEG induced drought conditions...
2016: Frontiers in Plant Science
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