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Plant, Cell & Environment

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https://www.readbyqxmd.com/read/28346818/regulation-of-low-temperature-stress-in-plants-by-micrornas
#1
REVIEW
Swati Megha, Urmila Basu, Nat N V Kav
Low temperature is one of the most common environmental stresses that seriously affects the growth and development of plants. However, plants have the plasticity in their defense mechanisms enabling them to tolerate and, sometimes, even survive adverse environmental conditions. MicroRNAs (miRNAs) are small non-coding RNAs, approximately 19-21 nucleotides in length, and are being increasingly recognized as regulators of gene expression at the post-transcriptional level and have the ability to influence a broad range of biological processes...
March 27, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28346742/leaf-economic-and-hydraulic-divergences-underpin-ecological-differentiation-in-the-bromeliaceae
#2
Jamie Males, Howard Griffiths
Leaf economic and hydraulic theory have rarely been applied to the ecological differentiation of speciose herbaceous plant radiations. The role of character trait divergences and network reorganisation in the differentiation of the functional types in the megadiverse Neotropical Bromeliaceae was explored by quantifying a range of leaf economic and hydraulic traits in 50 diverse species. Functional types, which are defined by combinations of C3 or CAM photosynthesis, terrestrial or epiphytic habits, and non-specialised, tank-forming or atmospheric morphologies, segregated clearly in trait space...
March 27, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28342210/does-the-turgor-loss-point-characterise-drought-response-in-dryland-plants
#3
Claire Farrell, Christopher Szota, Stefan K Arndt
The water potential at turgor loss point (Ψtlp ) has been suggested as a key functional trait for determining plant drought tolerance, due to its close relationship with stomatal closure. Ψtlp may indicate drought tolerance as plants which maintain gas exchange at lower midday water potentials as soil water availability declines also have lower Ψtlp . We evaluated 17 species from seasonally dry habitats, representing a range of life-forms, under well-watered and drought conditions, to determine how Ψtlp relates to stomatal sensitivity (pre-dawn water potential at stomatal closure: Ψgs0 ) and drought strategy (degree of isohydry or anisohydry; ΔΨMD between WW conditions and stomatal closure)...
March 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28338213/biochemical-model-of-c3-photosynthesis-applied-to-wheat-at-different-temperatures
#4
Viridiana Silva-Pérez, Robert T Furbank, Anthony G Condon, John R Evans
We examined the effects of leaf temperature on the estimation of maximal Rubisco capacity (Vcmax ) from gas exchange measurements of wheat leaves using a C3 photosynthesis model. Cultivars of spring wheat (Triticum aestivum (L)) and triticale (x Triticosecale Wittmack) were grown in a greenhouse or in the field and measured at a range of temperatures under controlled conditions in a growth cabinet (2 and 21 % O2 ) or in the field using natural diurnal variation in temperature, respectively. Published Rubisco kinetic constants for tobacco did not describe the observed CO2 response curves well as temperature varied...
March 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28337785/transcriptomic-and-metabolic-analyses-provide-new-insights-into-chilling-injury-in-peach-fruit
#5
Ke Wang, Xue-Ren Yin, Bo Zhang, Don Grierson, Chang-Jie Xu, Kun-Song Chen
Low temperature conditioning (LTC) alleviates peach fruit chilling injury but the underlying molecular basis is poorly understood. Here, changes in transcriptome, ethylene production, flesh softening, internal browning, and membrane lipids were compared in fruit maintained in constant 0 °C and LTC (pre-storage at 8 °C for 5 days before storage at 0 °C). LTC resulted in a higher rate of ethylene production and a more rapid flesh softening as a result of higher expression of ethylene biosynthetic genes and a series of cell wall hydrolases...
March 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28337773/histone-h2b-monoubiquitination-regulates-salt-stress-induced-microtubule-depolymerization-in-arabidopsis
#6
Sa Zhou, Qiuhong Chen, Yuhui Sun, Yingzhang Li
Histone H2B monoubiquitination (H2Bub1) is recognized as a regulatory mechanism that controls a range of cellular processes. We previously showed that H2Bub1 was involved in responses to biotic stress in Arabidopsis. However, the molecular regulatory mechanisms of H2Bub1 in controlling responses to abiotic stress remain limited. Here, we report that HISTONE MONOUBIQUITINATION1 (HUB1) and HUB2 played important regulatory roles in response to salt stress. Phenotypic analysis revealed that H2Bub1 mutants confer decreased tolerance to salt stress...
March 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28337762/molecular-interaction-between-pho2-and-gi-in-rice
#7
Shuai Li, Yinghui Ying, David Secco, Chuang Wang, Reena Narsai, James Whelan, Huixia Shou
Plants are often confronted to nutrient limiting conditions, such as inorganic phosphate (Pi) deficiency, resulting in a reduction in growth and yield. PHO2, encoding a ubiquitin-conjugating E2 enzyme, is a central component of the Pi-starvation response signaling pathway. A yeast-two-hybrid screen using Oryza sativa (rice) PHO2 as bait, revealed an interaction between OsPHO2 and OsGIGANTEA, a key regulator of flowering time, which was confirmed using bimolecular flourescenec complementation (BiFC). Characterization of rice Osgi and Ospho2 mutants revealed that they displayed several similar phenotypic features supporting a physiological role for this interaction...
March 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28337760/proteomics-of-contrasting-rice-genotypes-identification-of-potential-targets-for-raising-crops-for-saline-environment
#8
Nita Lakra, Charanpreet Kaur, Khalid Anwar, Sneh Lata Singla-Pareek, Ashwani Pareek
High salinity is one of the major problems in crop productivity, affecting seed germination as well as yield. In order to enhance tolerance of crops towards salinity, it is essential to understand the underlying physiological and molecular mechanisms. In this endeavor, study of contrasting genotypes of the same species differing in their response towards salinity stress can be very useful. In the present study, we have investigated temporal differences in morphological, physiological and proteome profiles of two contrasting genotypes of rice to understand the basis of salt-tolerance...
March 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28337744/tknockdown-of-an-inflorescence-meristem-specific-cytokinin-oxidase-osckx2-in-rice-reduces-yield-penalty-under-salinity-stress-condition
#9
Rohit Joshi, Khirod Kumar Sahoo, Amit Kumar Tripathi, Ritesh Kumar, Brijesh Kumar Gupta, Ashwani Pareek, Sneh Lata Singla-Pareek
Cytokinins play a significant role in determining grain yield in plants. Cytokinin oxidases catalyze irreversible degradation of cytokinins and hence modulate cellular cytokinin levels. Here, we studied the role of an inflorescence meristem-specific rice cytokinin oxidase - OsCKX2, in reducing yield penalty under salinity stress conditions. We utilized an RNAi-based approach to study the function of OsCKX2 in maintaining grain yield under salinity stress condition. Ultra-performance liquid chromatography (UPLC)-based estimation revealed a significant increase in cytokinins in the inflorescence meristem of OsCKX2-knockdown plants...
March 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28252189/quantitative-trait-loci-controlling-leaf-venation-in-arabidopsis
#10
Louai Rishmawi, Jonas Bühler, Benjamin Jaegle, Martin Hülskamp, Maarten Koornneef
Leaf veins provide the mechanical support and are responsible for the transport of nutrients and water to the plant. High vein density is a prerequisite for plants to have C4 photosynthesis. We investigated the genetic variation and genetic architecture of leaf venation traits within the species Arabidopsis thaliana using natural variation. Leaf venation traits, including leaf vein density (LVD) were analyzed in 66 worldwide accessions and 399 lines of the multi-parent advanced generation intercross (MAGIC) population...
March 2, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28247953/the-rapid-a-ci-response-photosynthesis-in-the-phenomic-era
#11
Joseph R Stinziano, Patrick B Morgan, Douglas J Lynch, Aaron J Saathoff, Dayle K McDermitt, David T Hanson
Phenotyping for photosynthetic gas exchange parameters is limiting our ability to select plants for enhanced photosynthetic carbon gain and to assess plant function in current and future natural environments. This is due, in part, to the time required to generate estimates of the maximum rate of ribulose-1,5-bisphosphate carboxylase oxygenase (Rubisco) carboxylation (Vc,max ) and the maximal rate of electron transport (Jmax ) from the response of photosynthesis (A) to the CO2 concentration inside leaf air spaces (Ci )...
March 1, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28245058/algal-light-sensing-and-photoacclimation-in-aquatic-environments
#12
REVIEW
Deqiang Duanmu, Nathan C Rockwell, J Clark Lagarias
Anoxygenic photosynthetic prokaryotes arose in ancient oceans ~3.5 billion years ago. Evolution of oxygenic photosynthesis by cyanobacteria followed soon after, enabling eukaryogenesis and the evolution of complex life. The Archaeplastida lineage dates back ~1.5 billion years to the domestication of a cyanobacterium. Eukaryotic algae have subsequently radiated throughout oceanic/fresh-water/terrestrial environments, adopting distinctive morphological and developmental strategies for adaptation to diverse light environments...
February 28, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28244594/unraveling-early-events-in-the-taphrina-deformans-prunus-persica-interaction-an-insight-into-the-differential-responses-in-resistant-and-susceptible-genotypes
#13
Laura A Svetaz, Claudia A Bustamante, Camila Goldy, Nery Rivero, Gabriela L Müller, Gabriel H Valentini, Alisdair R Fernie, María F Drincovich, María V Lara
Leaf peach curl is a devastating disease affecting leaves, flowers and fruits caused by the dimorphic fungus Taphrina deformans. To gain insight into the mechanisms of fungus pathogenesis and plant responses, leaves of a resistant and two susceptible P. persica genotypes were inoculated with blastospores (yeast), and the infection was monitored during 120 hpi. Fungal dimorphism to the filamentous form and induction of ROS, callose synthesis, cell death, and defense compound production was observed independently of the genotype...
February 28, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28241097/the-gmfwl1-fw2-2-like-nodulation-gene-encodes-a-plasma-membrane-microdomain-associated-protein
#14
Zhenzhen Qiao, Laurent Brechenmacher, Benjamin Smith, Gregory W Strout, William Mangin, Christopher Taylor, Scott D Russell, Gary Stacey, Marc Libault
The soybean gene GmFWL1 (FW2.2-like1) belongs to a plant-specific family that includes the tomato FW2-2 and the maize CNR1 genes, two regulators of plant development. In soybean, GmFWL1 is specifically expressed in root hair cells in response to rhizobia and in nodules. Silencing of GmFWL1 expression significantly reduced nodule numbers supporting its role during soybean nodulation. While the biological role of GmFWL1 has been described, its molecular function and, more generally, the molecular function of plant FW2...
February 27, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28240779/a-new-link-between-plant-metabolism-and-circadian-rhythms
#15
Noriane M L Simon, Antony N Dodd
No abstract text is available yet for this article.
February 27, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28240777/a-laboratory-simulation-of-arabidopsis-seed-dormancy-cycling-provides-new-insight-into-its-regulation-by-clock-genes-and-the-dormancy-related-genes-dog1-mft-cipk23-and-phya
#16
Steven Footitt, Hülya Ölcer-Footitt, Angela J Hambidge, William E Finch-Savage
Environmental signals drive seed dormancy cycling in the soil to synchronise germination with the optimal time of year; a process essential for species fitness and survival. Previous correlation of transcription profiles in exhumed seeds with annual environmental signals revealed the coordination of dormancy regulating mechanisms with the soil environment. Here, we developed a rapid and robust laboratory dormancy cycling simulation. The utility of this simulation was tested in two ways. Firstly using mutants in known dormancy-related genes (DELAY OF GERMINATION 1 (DOG1), MOTHER OF FLOWERING TIME (MFT), CBL-INTERACTING PROTEIN KINASE 23 (CIPK23) and PHYTOCHROME A (PHYA))...
February 27, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28239986/molecular-analysis-of-the-early-interaction-between-the-grapevine-flower-and-botrytis-cinerea-reveals-that-prompt-activation-of-specific-host-pathways-leads-to-fungus-quiescence
#17
Zeraye H Mehari, Stefania Pilati, Paolo Sonego, Giulia Malacarne, Urska Vrhovsek, Kristof Engelen, Paul Tudzynski, Michela Zottini, Elena Baraldi, Claudio Moser
Grapes quality and yield can be impaired by bunch rot, caused by the necrotrophic fungus Botrytis cinerea. Infection often occurs at flowering and the pathogen stays quiescent until fruit maturity. Here, we report a molecular analysis of the early interaction between B. cinerea and Vitis vinifera flowers, using a controlled infection system, confocal microscopy and integrated transcriptomic and metabolic analysis of the host and the pathogen. Flowers from fruiting cuttings of the cv. Pinot Noir were infected with GFP-labeled B...
February 27, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28236324/ying-and-yang-interplay-between-reactive-oxygen-and-reactive-nitrogen-species-controls-cell-functions
#18
Laura De Gara, Christine H Foyer
No abstract text is available yet for this article.
February 24, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28185293/assessing-frost-damages-using-dynamic-models-in-walnut-trees-exposure-rather-than-vulnerability-controls-frost-risks
#19
Guillaume Charrier, Isabelle Chuine, Marc Bonhomme, Thierry Améglio
Frost damages develop when exposure overtakes frost vulnerability. Frost risk assessment therefore needs dynamic simulation of frost hardiness using temperature and photoperiod in interaction with developmental stage. Two models, including or not the effect of photoperiod were calibrated using five years of frost hardiness monitoring (2007-2012), in two locations (low and high elevation) for three walnut genotypes with contrasted phenology and maximum hardiness (Juglans regia cv Franquette, Juglans regia x nigra 'Early' and 'Late')...
February 9, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28183154/photomorphogenic-responses-to-ultraviolet-b-light
#20
REVIEW
Gareth I Jenkins
Exposure to UV-B light regulates numerous aspects of plant metabolism, morphology and physiology through the differential expression of hundreds of genes. Photomorphogenic responses to UV-B are mediated by the photoreceptor UV RESISTANCE LOCUS8 (UVR8). Considerable progress has been made in understanding UVR8 action: the structural basis of photoreceptor function, how interaction with CONSTITUTIVELY PHOTOMORPHOGENIC 1 (COP1) initiates signaling and how REPRESSOR OF UV-B PHOTOMORPHOGENESIS (RUP) proteins negatively regulate UVR8 action...
February 9, 2017: Plant, Cell & Environment
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