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Plant Physiology

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https://www.readbyqxmd.com/read/28108698/genome-wide-analysis-of-fatty-acid-desaturation-and-its-response-to-temperature
#1
Guillaume Menard, Jose Martin Moreno, Fiona Bryant, Olaya Munoz-Azcarate, Amélie A Kelly, Keywan Hassani-Pak, Smita Kurup, Peter J Eastmond
Plants modify the polyunsaturated fatty acid content of their membrane and storage lipids in order to adapt to changes in temperature. In developing seeds this response is largely controlled by the activities of the microsomal ω-6 and ω-3 fatty acid desaturases, FAD2 and FAD3. Although temperature-regulation of desaturation has been studied at the molecular and biochemical level, the genetic control of this trait is poorly understood. Here we have characterised the response of Arabidopsis thaliana seed lipids to variation in ambient temperature and found that heat inhibits both ω-6 and ω-3 desaturation in phosphatidylcholine, leading to a proportional change in triacylglycerol composition...
January 20, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28108697/understanding-and-manipulating-meiotic-recombination-in-plants
#2
Christophe Lambing, F Christopher H Franklin, Chung-Ju Rachel Wang
No abstract text is available yet for this article.
January 20, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28104719/molecular-regulation-of-temperature-dependent-floral-induction-in-tulipa-gesneriana
#3
Hendrika Leeggangers, Harm Nijveen, Judit Nadal Bigas, Henk W M Hilhorst, Richard G H Immink
The vegetative to reproductive phase change in tulip is promoted by increasing temperatures during spring. The warm winters of recent years interfere with this process and are calling for new adapted cultivars. A better understanding of the underlying molecular mechanisms would be of help, but unlike the model plant Arabidopsis, very little is known about floral induction in tulip. To shed light on the gene regulatory network controlling flowering in tulip, RNA-sequencing was performed on meristem-enriched tissue collected under two contrasting temperature conditions, low and high...
January 19, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28104718/boncat-enables-time-resolved-analysis-of-protein-synthesis-in-native-plant-tissue
#4
Weslee Glenn, Shannon E Stone, Samuel H Ho, Michael J Sweredoski, Annie Moradian, Sonja Hess, Julia Bailey-Serres, David A Tirrell
Proteomic plasticity undergirds stress responses in plants, and understanding such responses requires accurate measurement of the extent to which proteins levels are adjusted to counter external stimuli. Here, we adapt bioorthogonal non-canonical amino acid tagging (BONCAT) to interrogate protein synthesis in vegetative Arabidopsis thaliana seedlings. BONCAT relies on the translational incorporation of a non-canonical amino acid (ncAA) probe into cellular proteins. In this study, the probe is the methionine surrogate azidohomoalanine (Aha), which carries a reactive azide moiety in its amino acid side chain...
January 19, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28100451/an-aphid-effector-targets-trafficking-protein-vps52-in-a-host-specific-manner-to-promote-virulence
#5
Patricia Rodriguez, Carmen Escudero-Martinez, Jorunn Bos
Plant- and animal-feeding insects secrete saliva inside their hosts, containing effectors, which may promote nutrient release and suppress immunity. Although for plant pathogenic microbes it is well established that effectors target host proteins to modulate host cell processes and promote disease, the host cell targets of herbivorous insects remain elusive. Here, we show that the existing plant pathogenic microbe effector paradigm can be extended to herbivorous insects in that effector-target interactions inside host cells modify critical host processes to promote plant susceptibility...
January 18, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28100450/a-2-oxoglutarate-dependent-dioxygenase-mediates-the-biosynthesis-of-glucoraphasatin-in-radish
#6
Tomohiro Kakizaki, Hiroyasu Kitashiba, Zhongwei Zou, Feng Li, Nobuko Fukino, Takayoshi Ohara, Takeshi Nishio, Masahiko Ishida
Glucosinolates (GSLs) are secondary metabolites whose degradation products confer intrinsic flavors and aromas to Brassicaceae vegetables. Several structures of GSLs are known in the Brassicaceae, and the biosynthetic pathway and regulatory networks have been elucidated in Arabidopsis thaliana. GSLs are precursors of chemical defense substances against herbivorous pests. Specific GSLs can act as feeding blockers or stimulants, depending on the pest species. Natural selection has led to diversity in the GSL compositions even within individual species...
January 18, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28096190/gain-of-function-mutants-of-the-cytokinin-receptors-ahk2-and-ahk3-regulate-plant-organ-size-flowering-time-and-plant-longevity
#7
Isabel Bartrina, Helen Jensen, Ondrej Novak, Miroslav Strnad, Tomas Werner, Thomas Schmülling
The phytohormone cytokinin is a regulator of numerous processes in plants. In Arabidopsis thaliana, the cytokinin signal is perceived by three membrane-located receptors named ARABIDOPSIS HISTIDINE KINASE2 (AHK2), AHK3 and AHK4/CRE1. How the signal is transmitted across the membrane is an entirely unknown process. The three receptors have been shown to operate mostly in a redundant fashion and only very few specific roles have been attributed to single receptors. Using a forward genetic approach, we isolated constitutively active gain-of-function variants of the AHK2 and AHK3 genes, named repressor of cytokinin deficiency2 (rock2) and rock3, respectively...
January 17, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28096189/suppressor-of-overexpression-of-co-1-negatively-regulates-dark-induced-leaf-degreening-and-senescence-by-directly-repressing-pheophytinase-and-other-senescence-associated-genes-in-arabidopsis
#8
Junyi Chen, Xiaoyu Zhu, Jun Ren, Kai Qiu, Zhongpeng Li, Zuokun Xie, Jiong Gao, Xin Zhou, Benke Kuai
Although the biochemical pathway of chlorophyll (Chl) degradation has been largely elucidated, how Chl is rapidly yet coordinatedly degraded during leaf senescence still remains elusive. Pheophytinase (PPH) is the enzyme for catalyzing the removal of phytol group from Phein a, and PPH expression is significantly induced during leaf senescence. To elucidate the transcriptional regulation of PPH, we used yeast one-hybrid system to screen for its trans-regulators. SUPPRESSOR OF OVEREXPRESSION OF CO 1 (SOC1), a key flowering pathway integrator, was initially identified as one of the putative trans-regulators of PPH...
January 17, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28082719/heteroblastic-development-of-transfer-cells-is-controlled-by-the-microrna-mir156-spl-module
#9
Suong Thi Thu Nguyen, Teighan Greaves, David W McCurdy
We report that wall ingrowth deposition in phloem parenchyma (PP) transfer cells (TCs) in leaf veins of Arabidopsis thaliana (Arabidopsis) represents a novel trait of heteroblasty. Development of PP TCs involves extensive deposition of wall ingrowths adjacent to cells of the sieve element/companion cell (SE/CC) complex. These PP TCs potentially facilitate phloem loading by enhancing efflux of symplasmic sucrose for subsequent active uptake into cells of the SE/CC complex. PP TCs with extensive wall ingrowths are ubiquitous in mature cotyledons and juvenile leaves, but dramatically less so in mature adult leaves, an observation consistent with PP TC development reflecting vegetative phase change (VPC) in Arabidopsis...
January 12, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28082718/analysis-of-exocyst-subunit-exo70-family-reveals-distinct-membrane-domains-in-tobacco-pollen-tubes
#10
Juraj Sekereš, Přemysl Pejchar, Jiří Šantrůček, Nemanja Vukasinovic, Viktor Žárský, Martin Potocký
The vesicle-tethering complex exocyst is one of the crucial cell polarity regulators. EXO70 subunit is required for the targeting of the complex and is represented by many isoforms in angiosperm plant cells. This diversity could be partly responsible for establishment and maintenance of membrane domains with different composition. To address this hypothesis, we employed growing pollen tube, a well-established cell polarity model system, and performed large-scale expression, localization and functional analysis of tobacco EXO70 isoforms...
January 12, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28082717/jasmonate-regulates-plant-responses-to-reoxygenation-through-activation-of-antioxidant-synthesis
#11
Shi Xiao, Li-Bing Yuan, Yang-Shuo Dai, Li-Juan Xie, Lu-Jun Yu, Ying Zhou, Yong-Xia Lai, Yi-Cong Yang, Le Xu, Qin-Fang Chen
Submergence induces hypoxia in plants; exposure to oxygen following submergence, termed reoxygenation, produces a burst of reactive oxygen species. The mechanisms of hypoxia sensing and signaling in plants have been well studied, but how plants respond to reoxygenation remains unclear. Here, we show that reoxygenation in Arabidopsis thaliana involves rapid accumulation of jasmonates (JAs) and increased transcript levels of JA biosynthesis genes. Application of exogenous methyl jasmonate improved tolerance to reoxygenation in wild-type Arabidopsis; also, mutants deficient in JA biosynthesis and signaling were very sensitive to reoxygenation...
January 12, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28082716/three-pectin-methyl-esterase-inhibitors-protect-cell-wall-integrity-for-immunity-to-botrytis
#12
Vincenzo Lionetti, Eleonora Fabri, Monica De Caroli, Aleksander R Hansen, William G T Willats, Gabriella Piro, Daniela Bellincampi
Infection by necrotrophs is a complex process that starts with the breakdown of the cell wall (CW) matrix initiated by CW degrading enzymes and results in an extensive tissue maceration. Plants exploit induced defense mechanisms based on biochemical modification of the CW components to protect themselves from enzymatic degradation. The pectin matrix is the main CW target of Botrytis cinerea and pectin methylesterification status is strongly altered in response to infection. The methylesterification of pectin is mainly controlled by pectin methylesterases (PMEs) which activity is post-transcriptionally regulated by endogenous protein inhbibitors (PMEIs)...
January 12, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28073984/transcription-factors-pverf15-and-pvmtf-1-form-a-cadmium-stress-transcriptional-pathway
#13
Tingting Lin, Wanning Yang, Wen Lu, Ying Wang, Xiaoting Qi
In plants, cadmium (Cd)-responsive transcription factors are key downstream effectors of Cd stress transcriptional pathways, which are capable of converging Cd stress signals through triggering the expression of Cd-detoxification genes. However, the upstream transcriptional regulatory pathways that modulate their responses to Cd are less clear. Previously, we identified a bean (Phaseolus vulgaris) metal response element-binding transcription factor1 (PvMTF-1) that responds to Cd and confers Cd tolerance in planta...
January 10, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28069670/the-acyl-desaturase-cer17-is-involved-in-producing-wax-unsaturated-primary-alcohols-and-cutin-monomers
#14
Xianpeng Yang, Huayan Zhao, Dylan K Kosma, Pernell Tomasi, John M Dyer, Rong-Jun Li, Xiulin Liu, Zhouya Wang, Eugene P Parsons, Matthew A Jenks, Shiyou Lu
We report n-6 monounsaturated primary alcohols (C26:1, C28:1, and C30:1 homologues) in the cuticular waxes of Arabidopsis inflorescence stem, a class of wax not previously reported in Arabidopsis. The Arabidopsis cer17 mutant was completely deficient in these monounsaturated alcohols, and CER17 was found to encode a predicted ACYL-COENZYME A DESATURASE LIKE4 (ADS4). Studies of the Arabidopsis cer4 mutant, and yeast variously expressing CER4 (a predicted fatty acyl-CoA reductase) with CER17/ADS4, demonstrated CER4's principal role in synthesis of these monounsaturated alcohols...
January 9, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28062836/modeling-stomatal-conductance
#15
Thomas N Buckley
No abstract text is available yet for this article.
January 6, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28062835/the-osmyb30-transcription-factor-suppresses-cold-tolerance-by-interacting-with-a-jaz-protein-and-suppressing-%C3%AE-amylase-expression
#16
Yan Lv, Mei Yang, Dan Hu, Zeyu Yang, Siqi Ma, Xianghua Li, Lizhong Xiong
Cold stress is one of the major limiting factors for rice productivity. Several MYB transcriptional factors have been reported as important regulators in cold response, but the molecular mechanisms are largely unknown. In this study, we characterized a cold-responsive R2R3-type MYB gene OsMYB30 for its regulatory function in cold tolerance in rice (Oryza sativa). Functional analysis revealed that overexpression of OsMYB30 in rice resulted in increased cold sensitivity, while the osmyb30 knockout mutant showed increased cold tolerance...
January 6, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28057895/gibberellin-signaling-requires-chromatin-remodeler-pickle-to-promote-vegetative-growth-and-phase-transitions
#17
Jeongmoo Park, Dong-Ha Oh, Maheshi Dassanayake, Khoa Thi Nguyen, Joe Ogas, Giltsu Choi, Tai-Ping Sun
PICKLE (PKL) is an ATP-dependent Chromodomain-Helicase-DNA-binding domain (CHD3) chromatin remodeling enzyme in Arabidopsis thaliana. Previous studies showed that PKL promotes embryonic-to-vegetative transition by inhibiting expression of seed-specific genes during seed germination. The pkl mutants display a low penetrance of the 'pickle root' phenotype with a thick and green primary root that retains embryonic characteristics. The penetrance of this pickle root phenotype in pkl is dramatically increased in GA-deficient conditions...
January 5, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28057894/validating-genome-wide-association-candidates-through-quantitative-variation-in-nodulation
#18
Shaun J Curtin, Peter Tiffin, Joseph Guhlin, Diana I Trujillo, Liana T Burghardt, Paul Atkins, Nicholas J Baltes, Roxanne Denny, Daniel F Voytas, Robert M Stupar, Nevin Dale Young
Genome wide association (GWA) studies offer the opportunity to identify genes that contribute to naturally occurring variation in quantitative traits. However, GWA relies exclusively on statistical association, so functional validation is necessary to make strong claims about gene function. We used a combination of gene-disruption platforms (Tnt1 retro-transposons, hairpin RNA-interference constructs, and CRISPR/Cas9 nucleases) together with randomized, well-replicated experiments to evaluate the function of genes that an earlier GWAS in Medicago truncatula had identified as candidates contributing to variation in the symbiosis between legumes and rhizobia...
January 5, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28049741/integrating-omics-and-alternative-splicing-reveals-insights-into-grape-response-to-high-temperature
#19
Jianfu Jiang, Xinna Liu, Guotian Liu, Chonghuai Liu, Shaohua Li, Lijun Wang
Heat stress is one of the primary abiotic stresses that limit crop production. Grape is a cultivated fruit with high economic value throughout the world, with its growth and development often influenced by high temperature. Alternative splicing (AS) is a widespread phenomenon increasing transcriptome and proteome diversity. We conducted high temperature treatments (35oC, 40oC and 45oC) on grapevines (Vitis vinifera), and assessed transcriptomic (especially AS) and proteomic changes in leaves. We found that nearly 70% of the genes were alternatively spliced under high temperature...
January 3, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28049740/resolvase-osgen1-mediates-dna-repair-by-homologous-recombination
#20
Chong Wang, James Higgins, Yi He, Pingli Lu, Dabing Zhang, Wanqi Liang
Yen1/GEN1 are canonical Holliday Junction (HJ) resolvases that belong to the RAD2/XPG family. In eukaryotes, such as budding yeast, mice, worms, and humans, Yen1/GEN1 work together with Mus81-Mms4/MUS81-EME1 and Slx1-Slx4/SLX1-SLX4 in DNA repair by homologous recombination to maintain genome stability. In plants, the biological function of Yen1/GEN1 remains largely unclear. In this study, we characterized the loss of function mutants of OsGEN1 and OsSEND1, a pair of paralogs of Yen1/GEN1 in rice. We first investigated the role of OsGEN1 during meiosis and found a reduction in chiasma frequency by ~6% in osgen1 mutants, compared to wild type, suggesting a possible involvement of OsGEN1 in the formation of crossovers...
January 3, 2017: Plant Physiology
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