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Plant, Cell & Environment

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https://www.readbyqxmd.com/read/28941290/physiological-and-molecular-mechanisms-underlying-the-integration-of-light-and-temperature-cues-in-arabidopsis-thaliana-seeds
#1
María Verónica Arana, Rocío Soledad Tognacca, Maximiliano Estravis-Barcalá, Rodolfo Augusto Sánchez, Javier Francisco Botto
The relief of dormancy and the promotion of seed germination are of extreme importance for a successful seedling establishment. Although alternating temperatures and light are signals promoting the relief of seed dormancy, the underlying mechanisms of their interaction in seeds are scarcely known. By exposing imbibed Arabidopsis thaliana dormant seeds to two-day temperature cycles previous of a red light pulse, we demonstrate that the germination mediated by phytochrome B requires the presence of functional PRR7 (PSEUDO-RESPONSE REGULATOR 7) and TOC1 (TIMING OF CAB EXPRESSION 1) alleles...
September 23, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28940493/cytosolic-glyceraldehyde-3-phosphate-dehydrogenases-play-crucial-roles-in-controlling-cold-induced-sweetening-and-apical-dominance-of-potato-solanum-tuberosum-l-tubers
#2
Tengfei Liu, Hui Fang, Jun Liu, Stephen Reid, Juan Hou, Tingting Zhou, Zhendong Tian, Botao Song, Conghua Xie
Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) is an important enzyme that functions in producing energy and supplying intermediates for cellular metabolism. Recent researches indicate that GAPDHs have multiple functions beside glycolysis. However, little information is available for functions of GAPDHs in potato. Here we identified four putative cytosolic GAPDH genes in potato genome. The expression analysis demonstrated that the StGAPC1, StGAPC2, and StGAPC3 are constitutively expressed in potato tissues and cold inducible in tubers...
September 20, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28940206/combined-transcriptomic-and-proteomic-analysis-constructs-a-new-model-for-light-induced-anthocyanin-biosynthesis-in-eggplant-solanum-melongena-l
#3
Jing Li, Li Ren, Zhen Gao, Mingmin Jiang, Yang Liu, Lu Zhou, Yongjun He, Huoying Chen
Light is a key environmental factor affecting anthocyanin biosynthesis. Our previous study demonstrated that 'Lanshan Hexian' is a light-sensitive eggplant cultivar, but its regulatory mechanism is unknown. Here, delphinidin-3-[4-(cis-p-coumaroyl)-rhamnosyl-glucopyranoside]-5-glucopyranoside and delphinidin-3-[4-(trans-p-coumaroyl)-rhamnosyl-glucopyranoside]-5-glucopyranoside were identified as the main anthocyanin components in 'Lanshan Hexian' by ultra-performance liquid chromatography-tandem mass spectrometry...
September 20, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28926102/in-situ-temperature-relationships-of-biochemical-and-stomatal-controls-of-photosynthesis-in-four-lowland-tropical-tree-species
#4
Martijn Slot, Klaus Winter
Net photosynthetic carbon uptake of Panamanian lowland tropical forest species is typically optimal at 30-32°C. The processes responsible for the decrease in photosynthesis at higher temperatures are not fully understood for tropical trees. We determined temperature responses of maximum rates of RuBP-carboxylation (VCMax ) and RuBP-regeneration (JMax ), stomatal conductance (Gs ) and respiration in the light (RLight ) in situ for four lowland tropical tree species in Panama. Gs had the lowest temperature optimum (TOpt ), similar to that of net photosynthesis, and photosynthesis became increasingly limited by stomatal conductance as temperature increased...
September 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28925070/the-fructan-syndrome-evolutionary-aspects-and-common-themes-among-plants-and-microbes
#5
REVIEW
Maxime Versluys, Onur Kirtel, Ebru Toksoy Öner, Wim Van den Ende
Fructans are multifunctional fructose-based water soluble carbohydrates found in all biological kingdoms but not in animals. Most research has focused on plant- and microbial fructans and has received a growing interest because of their practical applications. Nevertheless, the origin of fructan production, the so-called 'fructan syndrome', is still unknown. Why fructans only occur in a limited number of plant and microbial species remains unclear. In this review, we provide an overview of plant and microbial fructan research with a focus on fructans as an adaptation to the environment and their role in (a)biotic stress tolerance...
September 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28910491/a-double-epsps-gene-mutation-endowing-glyphosate-resistance-shows-a-remarkably-high-resistance-cost
#6
Heping Han, Martin M Vila-Aiub, Adam Jalaludin, Qin Yu, Stephen B Powles
A novel glyphosate resistance double point mutation (T102I/P106S, TIPS) in the 5-enolpyruvylshikimate-3 phosphate synthase (EPSPS) gene has been recently identified for the first time only in the weed species Eleusine indica. Quantification of plant resistance cost associated with the TIPS and the often reported glyphosate resistance single P106S mutation was performed. A significant resistance cost (50% in seed number currency) associated with the homozygous TIPS but not the homozygous P106S EPSPS variant was identified in E...
September 14, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28898434/cold-sensing-in-grapevine-which-signals-are-upstream-of-the-microtubular-thermometer
#7
Lixin Wang, Peter Nick
Plants can acquire freezing tolerance in response to cold, but non-freezing temperatures. To efficiently activate this cold acclimation, low temperature has to be sensed and processed swiftly, a process that is linked with a transient elimination of microtubules. Here, we address cold-induced microtubules elimination in a grapevine cell line stably expressing a GFP fusion of Arabidopsis TuB6, which allows to follow their response in vivo and to quantify this response by quantitative image analysis. We use time-course studies with several specific pharmacological inhibitors and activators to dissect the signalling events acting upstream of microtubules elimination...
September 12, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28898428/soil-co2-venting-as-one-of-the-mechanisms-for-tolerance-of-zn-deficiency-by-rice-in-flooded-soils
#8
Marie-Cecile Affholder, Dominik J Weiss, Matthias Wissuwa, Sarah E Johnson-Beebout, Guy J D Kirk
We sought to explain rice (Oryza sativa) genotype differences in tolerance of zinc (Zn) deficiency in flooded paddy soils and the counter-intuitive observation, made in earlier field experiments, that Zn uptake per plant increases with increasing planting density. We grew tolerant and intolerant genotypes in a Zn-deficient flooded soil at high and low planting densities, and found (a) plant Zn concentrations and growth increased with planting density and more so in the tolerant genotype, whereas the concentrations of other nutrients decreased, indicating a specific effect on Zn uptake; (b) the effects of planting density and genotype on Zn uptake could only be explained if the plants induced changes in the soil to make Zn more soluble; and (c) the genotype and planting density effects were both associated with decreases in dissolved CO2 in the rhizosphere soil solution and resulting increases in pH...
September 12, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28898417/exploring-how-viruses-enhance-plants-resilience-to-drought-and-the-limits-to-this-form-of-viral-payback
#9
John Peter Carr
Virus infection can enhance the ability of plants to resist the effects of drought. This article comments on a new study published in Plant, Cell and Environment by Aguilar and colleagues in which they investigated the underlying mechanisms of virus-induced drought resistance, including the potential role of salicylic acid, and the effects of virus infection on seed production under conditions of drought.
September 12, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28875560/not-changes-in-membrane-fluidity-but-proteotoxic-stress-triggers-heat-shock-protein-expression-in-chlamydomonas-reinhardtii
#10
Mark Rütgers, Ligia Segatto Muranaka, Miriam Schulz-Raffelt, Sylvia Thoms, Juliane Schurig, Felix Willmund, Michael Schroda
A conserved reaction of all organisms exposed to heat stress is an increased expression of heat shock proteins (HSPs). Several studies have proposed that HSP expression in heat-stressed plant cells is triggered by an increased fluidity of the plasma membrane. Among the main lines of evidence in support of this model are (i) the degree of membrane lipid saturation was higher in cells grown at elevated temperatures and correlated with a lower amplitude of HSP expression upon a temperature upshift; (ii) membrane fluidizers induce HSP expression at physiological temperatures; (iii) membrane rigidifier dimethylsulfoxide dampens heat-induced HSP expression...
September 6, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28875517/are-plants-sentient
#11
Paco Calvo, Vaidurya Sahi, Anthony Trewavas
Feelings in humans are mental states representing groups of physiological functions that usually have defined behavioural purposes. Feelings, being evolutionarily ancient, are thought to be coordinated in the brain stem of animals. One function of the brain is to prioritise between competing mental states, and thus groups of physiological functions and in turn behaviour. Plants use groups of coordinated physiological activities to deal with defined environmental situations but currently have no known mental state to prioritise any order of response...
September 6, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28865108/glycerolipid-analysis-during-desiccation-and-recovery-of-the-resurrection-plant-xerophyta-humilis-bak-dur-and-schinz
#12
Freedom Tshabuse, Jill M Farrant, Lydie Humbert, Deborah Moura, Dominique Rainteau, Christophe Espinasse, Abdelghani Idrissi Taghki, Franck Merlier, Sébastien Acket, Mohamad S Rafudeen, Brigitte Thomasset, Eric Ruelland
Xerophyta humilis is a poikilochlorophyllous monocot resurrection plant used as a model to study vegetative desiccation tolerance. Dehydration imposes tension and ultimate loss of integrity of membranes in desiccation sensitive species. We investigated the predominant molecular species of glycerolipids present in root and leaf tissues, using multiple reaction monitoring mass spectrometry, then analysed changes therein during dehydration and subsequent rehydration of whole plants. The presence of fatty acids with long carbon chains and with odd numbers of carbons were detected and confirmed by gas chromatography...
September 2, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28865087/the-arabidopsis-u-box-e3-ubiquitin-ligase-pub30-negatively-regulates-salt-tolerance-by-facilitating-bri1-kinase-inhibitor-1-bki1-degradation
#13
Ming Zhang, Jinfeng Zhao, Long Li, Yanan Gao, Linlin Zhao, Suyash Bhimgonda Patil, Jingjing Fang, Wenhui Zhang, Yuhong Yang, Ming Li, Xueyong Li
The Arabidopsis U-box E3 ubiquitin (Ub) ligases play an important role in the ubiquitin/26S proteasome-mediated protein degradation pathway. Recently PUB30 has been reported to participate in the salt stress response during seed germination stage in ABA-independent manner, but the molecular mechanism remains to be elucidated. Here we displayed that the pub30 mutant was more tolerant to salt stress during seed germination, whereas the mutant of its closest homologue PUB31 showed mild sensitivity to salt stress...
September 2, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28857271/nitric-oxide-is-essential-for-the-development-of-aerenchyma-in-wheat-roots-under-hypoxic-stress
#14
Aakanksha Wany, Aprajita Kumari, Kapuganti Jagadis Gupta
In response to flooding/water-logging, plants develop various anatomical changes including the formation of lysigenous aerenchyma for the delivery of oxygen to roots. Under hypoxia, plants produce high levels of nitric oxide (NO) but the role of this molecule in plant adaptive response to hypoxia is not known. Here, we investigated whether ethylene-induced aerenchyma requires hypoxia-induced NO. Under hypoxic conditions, wheat roots produced NO apparently via nitrate reductase and scavenging of NO led to a marked reduction in aerenchyma formation...
August 30, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28857245/root-traits-of-european-vicia-faba-cultivars-using-machine-learning-to-explore-adaptations-to-agro-climatic-conditions
#15
Jiangsan Zhao, Peter Sykacek, Gernot Bodner, Boris Rewald
Faba bean (Vicia faba L.) is an important source of protein but breeding for increased yield stability and stress tolerance is hampered by the scarcity of phenotyping information. Because comparisons of cultivars adapted to different agro-climatic zones improve our understanding of stress tolerance mechanisms, the root architecture and morphology of 16 European faba bean cultivars were studied at maturity. Different machine learning (ML) approaches were tested in their usefulness to analyse trait variations between cultivars...
August 30, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28857190/a-novel-family-of-transcription-factors-conserved-in-angiosperms-is-required-for-aba-signaling
#16
Hainan Tian, Siyu Chen, Wenting Yang, Tianya Wang, Kaijie Zheng, Yating Wang, Yuxin Cheng, Na Zhang, Shanda Liu, Dongqiu Li, Bao Liu, Shucai Wang
The plant hormone abscisic acid (ABA) plays a crucial role in regulating plant responses to environmental stresses. Interplay of several different proteins including the PYR/PYL/RCAR receptors, A-group PP2C protein phosphatases, SnRK2 protein kinases and downstream transcription factors regulates ABA signaling. We report here the identification of a family of ABA-induced transcription repressors (AITRs) that act as feedback regulators in ABA signaling. We found that the expression of all the six Arabidopsis AITR genes was induced by exogenously ABA, and their expression levels were decreased in ABA biosynthesis mutant aba1-5...
August 30, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28857187/a-dichotomy-resolved-plant-growth-can-control-the-rate-of-starch-accumulation
#17
Thomas D Sharkey
No abstract text is available yet for this article.
August 30, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28815648/direct-uptake-of-hco3-in-the-marine-angiosperm-posidonia-oceanica-l-delile-driven-by-a-plasma-membrane-h-economy
#18
Lourdes Rubio, Delia García, María J García-Sánchez, F Xavier Niell, Hubert H Felle, José A Fernández
Seagrasses access HCO3(-) for photosynthesis by two mechanisms, apoplastic carbonic anhydrase-mediated dehydration of HCO3(-) to CO2 , and direct HCO3(-) uptake. Here we have studied plasma membrane energization and the mechanism for HCO3(-) import in Posidonia oceanica. Classical electrophysiology and ion selective microelectrodes were used to measure the membrane potential, cytosolic pH and the cytosolic concentrations of Na(+) and Cl(-) upon the addition of HCO3(-) . The photosynthetic response to HCO3(-) and to inhibitors was also measured...
August 16, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28810288/overexpression-of-demeter-a-dna-demethylase-promotes-early-apical-bud-maturation-in-poplar
#19
Daniel Conde, Alicia Moreno-Cortés, Christopher Dervinis, José M Ramos-Sánchez, Matias Kirst, Mariano Perales, Pablo González-Melendi, Isabel Allona
The transition from active growth to dormancy is critical for the survival of perennial plants. We identified a DEMETER-like (CsDML) cDNA from a winter-enriched cDNA subtractive library in chestnut (Castanea sativa Mill.), an economically and ecologically important species. Next, we characterized this DNA demethylase and its putative orthologue in the more experimentally tractable hybrid poplar (Populus tremula x alba), under the signals that trigger bud dormancy in trees. We performed phylogenetic and protein sequence analysis, gene expression profiling and 5mC immunodetection studies to evaluate the role of CsDML and its homologue in poplar, PtaDML6...
August 15, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28792065/environmental-plasticity-of-pinot-noir-grapevine-leaves-a-trans-european-study-of-morphological-and-biochemical-changes-along-a-1500-km-latitudinal-climatic-gradient
#20
Antonella Castagna, Kristóf Csepregi, Susanne Neugart, Gaetano Zipoli, Kristýna Večeřová, Gábor Jakab, Tjaša Jug, Laura Llorens, Javier Martínez-Abaigar, Johann Martínez-Lüscher, Encarnación Núñez-Olivera, Annamaria Ranieri, Katharina Schoedl-Hummel, Monika Schreiner, Péter Teszlák, Susanne Tittmann, Otmar Urban, Dolors Verdaguer, Marcel A K Jansen, Éva Hideg
A two-year study explored metabolic and phenotypic plasticity of sun acclimated Vitis vinifera cv. Pinot noir leaves collected from twelve locations across a 36.69(o) N - 49.98(o) N latitudinal gradient. Leaf morphological and biochemical parameters were analysed in the context of meteorological parameters and the latitudinal gradient. We found that leaf fresh weight and area were negatively correlated with both global and UV radiation; cumulated global radiation being a stronger correlator. Cumulative UV radiation (sumUVR) was the strongest correlator with most leaf metabolites and pigments...
August 9, 2017: Plant, Cell & Environment
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