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Physiologia Plantarum

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https://www.readbyqxmd.com/read/27935108/abscisic-acid-and-transpiration-rate-are-involved-in-the-response-to-boron-toxicity-in-arabidopsis-plants
#1
Miguel Ángel Macho-Rivero, Juan José Camacho-Cristóbal, María Begoña Herrera-Rodríguez, Maren Müller, Sergi Munné-Bosch, Agustín González-Fontes
Boron (B) is an essential microelement for vascular plant development, but its toxicity is a major problem affecting crop yields in arid and semi-arid areas of the world. In the literature, several genes involved in abscisic acid (ABA) signalling and responses are upregulated in Arabidopsis roots after treatment with excess B. It is known that the AtNCED3 gene, which encodes a crucial enzyme for ABA biosynthesis, plays a key role in the plant response to drought stress. In this study, root AtNCED3 expression and shoot ABA content were rapidly increased in wild-type plants upon B-toxicity treatment...
December 9, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27935073/no-accumulation-alleviates-h2-o2-dependent-oxidative-damage-induced-by-ca-no3-2-stress-in-the-leaves-of-pumpkin-grafted-cucumber-seedlings
#2
Lin Li, Sheng Shu, Qing Xu, Ya-Hong An, Jin Sun, Shi-Rong Guo
Nitric oxide (NO) and hydrogen peroxide (H2 O2 ), two important signalling molecules, are stimulated in plants by abiotic stresses. In this study, we investigated the role of NO and its interplay with H2 O2 in the response of self-grafted and salt-tolerant pumpkin-grafted (Cucurbita maxima × C. moschata) cucumber seedlings to 80 mM Ca(NO3 )2 stress. Endogenous NO and H2 O2 production in self-grafted seedlings increased in a time-dependent manner, reaching maximum levels after 24 h of Ca(NO3 )2 stress. In contrast, a transient increase in NO production, accompanied by H2 O2 accumulation, was observed at 2 h in rootstock-grafted plants...
December 9, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27935060/mtmapkk4-is-an-essential-gene-for-growth-and-reproduction-of-medicago-truncatula
#3
Tao Chen, Bo Zhou, Liujian Duan, Hui Zhu, Zhongming Zhang
Mitogen-activated protein kinase (MAPK) cascades are universal signalling modules in eukaryotes, including yeasts, animals and plants. They are involved in responses to various biotic and abiotic stresses, hormones, cell division and developmental processes. A MAPK cascade is composed of three functionally tiered protein kinases, namely MAPK, MAPK kinases (MAPKKs) and MAPK kinase kinases (MAPKKKs). These kinases have been intensively studied for their roles in developmental and physiological processes in various organisms...
December 9, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27893161/elevated-co2-plus-chronic-warming-reduces-nitrogen-uptake-and-levels-or-activities-of-nitrogen-uptake-and-assimilatory-proteins-in-tomato-roots
#4
Dileepa Madushanka Jayawardena, Scott Alan Heckathorn, Deepesh Raj Bista, Sasmita Mishra, Jennifer Kay Boldt, Charles Richard Krause
Atmospheric CO2 enrichment is expected to often benefit plant growth, despite causing global warming and nitrogen (N) dilution in plants. Most plants primarily procure N as inorganic nitrate (NO3(-) ) or ammonium (NH4(+) ), using membrane-localized transport proteins in roots, which are key targets for improving N use. Though interactive effects of elevated CO2 , chronic warming, and N form on N relations are expected, these have not been studied. In this study, tomato (Solanum lycopersicum) plants were grown at two levels of CO2 (400 or 700 ppm) and two temperature regimes (30 or 37 °C), with NO3(-) or NH4(+) as the N source...
November 28, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27883217/nitric-oxide-is-involved-in-methane-induced-adventitious-root-formation-in-cucumber
#5
Fang Qi, Zhixin Xiang, Ninghai Kou, Weiti Cui, Daokun Xu, Ren Wang, Dan Zhu, Wenbiao Shen
Our previous studies revealed that methane (CH4 ) induces adventitious rooting in cucumber. However, the corresponding molecular mechanism is still elusive. In this work, we discovered that CH4 triggered the accumulation of nitric oxide (NO) and thereafter cucumber adventitious rooting, mimicking the inducing effects of sodium nitroprusside (SNP) and NONOate (two NO-releasing compounds). Above mentioned responses were sensitive to NO scavenger(s), showing that the accumulation of NO and adventitious root development were respectively impaired...
November 24, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27859326/factors-influencing-stomatal-conductance-in-response-to-water-availability-in-grapevine-a-meta-analysis
#6
Anouk Lavoie-Lamoureux, Dario Sacco, Paul-André Risse, Claudio Lovisolo
The main factors regulating grapevine response to decreasing water availability were assessed under statistical support using published data related to leaf water relations in an extensive range of scion and rootstock genotypes. Matching Ψleaf and gs data were collected from peer-reviewed literature with associated information. The resulting database contained 718 data points from 26 different Vitis vinifera varieties investigated as scions, 15 non-V. vinifera rootstock genotypes and 11 own-rooted V. vinifera varieties...
November 18, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27859364/significance-of-structural-variation-in-thylakoid-membranes-in-maintaining-functional-photosystems-during-reproductive-growth
#7
Hatsumi Nozue, Kaori Oono, Yoshinobu Ichikawa, Shun Tanimura, Kana Shirai, Kintake Sonoike, Masayuki Nozue, Nobuaki Hayashida
Structural variation in the stroma-grana arrangement of the thylakoid membranes, such as changes in the thickness of the grana stacks and in the ratio between grana and inter-grana thylakoid, is often observed. Broadly, such alterations are considered acclimation to changes in growth and the environment. However, the relation of thylakoid morphology to plant growth and photosynthesis remains obscure. Here, we report changes in the thylakoid during leaf development under a fixed light condition. Histological studies on the chloroplasts of fresh green Arabidopsis leaves have shown that characteristically shaped thylakoid membranes lacking the inter-grana region, referred to hereafter as isolated-grana, occurred adjacent to highly ordered, large grana layers...
November 17, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27861954/special-trends-in-cbf-and-dreb2-groups-in-eucalyptus-gunnii-vs-eucalyptus-grandis-suggest-that-cbf-are-master-players-in-the-trade-off-between-growth-and-stress-resistance
#8
Hong C Nguyen, Phi B Cao, Hélène San Clemente, Raphaël Ployet, Fabien Mounet, Natalie Ladouce, Luc Harvengt, Christiane Marque, Chantal Teulieres
Annotation of the Eucalyptus grandis genome showed a large amplification of the DREB1/CBF group without recent DREB2 gene duplication compared to other plant species. The present annotation of the CBF and DREB2 genes from a draft of the Eucalyptus gunnii genome sequence reveals at least an additional CBF copy in the E. gunnii genome compared to E. grandis, suggesting that this group is still evolving, unlike the DREB2 group. This study aims to investigate the redundancy/neo- or sub-functionalization of the duplicates and the relative involvement of the two groups in abiotic stress responses in both E...
November 16, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27800617/contribution-of-constitutive-characteristics-of-lipids-and-phenolics-in-roots-of-tree-species-in-myrtales-to-aluminum-tolerance
#9
Eriko Maejima, Mitsuru Osaki, Tadao Wagatsuma, Toshihiro Watanabe
High aluminum (Al) concentration in soil solution is the most important factor restricting plant growth in acidic soils. However, various plant species naturally grow in such soils. Generally, they are highly tolerant to Al, but organic acid exudation, the most common Al tolerance mechanism, cannot explain their tolerance. Lower phospholipid and higher sterol proportions in root plasma membrane enhance Al tolerance. Other cellular components, such as cell walls and phenolics, may also be involved in Al tolerance mechanisms...
November 1, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27787914/malate-secretion-from-the-root-system-is-an-important-reason-for-higher-resistance-of-miscanthus-sacchariflorus-to-cadmium
#10
Haipeng Guo, Xue Feng, Chuntao Hong, Houming Chen, Fanrong Zeng, Bingsong Zheng, Dean Jiang
Miscanthus is a vigorous perennial Gramineae genus grown throughout the world as a promising bioenergy crop and generally regarded as heavy metal tolerant due to its ability to absorb heavy metals. However, little is known about the mechanism for heavy metal tolerance in Miscanthus. In this study, two Miscanthus species [Miscanthus (M.) sacchariflorus and M. floridulus] exhibiting different Cd sensitivity were used to address the mechanisms of Cd tolerance. Under the same Cd stress, M. sacchariflorus showed higher Cd tolerance with better growth and lower Cd accumulation in both shoots and roots than M...
October 27, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27779760/a-novel-root-to-shoot-stomatal-response-to-very-high-co2-levels-in-the-soil-electrical-hydraulic-and-biochemical-signalling
#11
Janice A Lake, Heather J Walker, Duncan D Cameron, Barry H Lomax
Investigations were undertaken in the context of the potential environmental impact of carbon capture and storage (CCS) transportation in the form of a hypothetical leak of extreme levels of CO2 into the soil environment and subsequent effects on plant physiology. Laboratory studies using purpose built soil chambers, separating and isolating the soil and aerial environments, were used to introduce high levels of CO2 gas exclusively into the rhizosphere. CO2 concentrations greater than 32% in the isolated soil environment revealed a previously unknown whole plant stomatal response...
October 25, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27762446/the-purple-acid-phosphatase-gmpap21-enhances-internal-phosphorus-utilization-and-possibly-plays-a-role-in-symbiosis-with-rhizobia-in-soybean
#12
Chengchen Li, Caifeng Li, Haiyan Zhang, Hong Liao, Xiurong Wang
Induction of secreted and intracellular purple acid phosphatases (PAPs; EC 3.1.3.2) is widely recognized as an adaptation of plants to phosphorus (P) deficiency. The secretion of PAPs plays important roles in P acquisition. However, little is known about the functions of intracellular PAP in plants and nodules. In this study, we identified a novel PAP gene GmPAP21 in soybean. Expression of GmPAP21 was induced by P limitation in nodules, roots and old leaves, and increased in roots with increasing duration of P starvation...
October 20, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27747895/the-arabidopsis-ugt87a2-a-stress-inducible-family-1-glycosyltransferase-is-involved-in-the-plant-adaptation-to-abiotic-stresses
#13
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 the UGTs remain unknown or fragmentary. Here, we report data for the Arabidopsis UGT87A2, a stress-regulated GT. We found that UGT87A2 could be dramatically induced by salinity, osmotic stress, drought and ABA...
October 17, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27734513/transformation-of-plastids-in-soil-shaded-lowermost-hypocotyl-segments-of-bean-phaseolus-vulgaris-during-a-60-day-cultivation-period
#14
Andrea Kakuszi, Katalin Solymosi, Béla Böddi
The maintenance but substantial transformation of plastids was found in lowermost hypocotyl segments of soil-grown bean plants (Phaseolus vulgaris cv. Magnum) during a 60-day cultivation period. Although the plants were grown under natural light-dark cycles, this hypocotyl segment was under full coverage of the soil in 5-7 cm depth, thus it was never exposed to light. The 4-day old plants were fully etiolated: amyloplasts, occasionally prolamellar bodies, protochlorophyllide (Pchlide) and protochlorophyll (Pchl) were found in the hypocotyls of these young seedlings...
October 13, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27734509/zinc-hyperaccumulation-substitutes-for-defense-failures-beyond-salicylate-and-jasmonate-signaling-pathways-of-alternaria-brassicicola-attack-in-noccaea-caerulescens
#15
Berta Gallego, Soledad Martos, Catalina Cabot, Juan Barceló, Charlotte Poschenrieder
The hypothesis of metal defense as a substitute for a defective biotic stress signaling system in metal hyperaccumulators was tested using the pathosystem Alternaria brassicicola - Noccaea caerulescens under low (2 μM), medium (12 μM), and high (102 μM) Zn supply. Regardless the Zn supply, N. caerulescens responded to fungal attack with the activation of both HMA4 coding for a Zn transporter, and biotic stress signaling pathways. Salicylate, jasmonate, abscisic acid, and indoleacetic acid concentrations, as well as biotic stress marker genes (PDF1...
October 13, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27716933/solanum-tuberosum-stcdpk1-is-regulated-by-mir390-at-the-posttranscriptional-level-and-phosphorylates-the-auxin-efflux-carrier-stpin4-in-vitro-a-potential-downstream-target-in-potato-development
#16
Franco Santin, Sneha Bhogale, Elisa Fantino, Carolina Grandellis, Anjan K Banerjee, Rita M Ulloa
Among the many factors that regulate potato tuberization, calcium and Calcium Dependent Protein Kinases (CDPKs) play an important role. CDPK activity increases at the onset of tuber formation with StCDPK1 expression being strongly induced in swollen stolons. However, not much is known about the transcriptional and posttranscriptional regulation of StCDPK1 or its downstream targets in potato development. To elucidate further, we analyzed its expression in different tissues and stages of the life cycle. Histochemical analysis of StCDPK1::GUS plants demonstrated that StCDPK1 is strongly associated with the vascular system in stems, roots, during stolon to tuber transition, and in tuber sprouts...
October 7, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27709637/arabidopsis-thaliana-serpins-atsrp4-and-atsrp5-negatively-regulate-stress-induced-cell-death-and-effector-triggered-immunity-induced-by-bacterial-effector-avrrpt2
#17
Lipika Bhattacharjee, Deepjyoti Singh, Janesh Kumar Gautam, Ashis Kumar Nandi
Protease inhibitors and their cognate proteases regulate growth, development and defense. Serine protease inhibitors (serpins) constitute a large family of genes in most metazoans and plants. Drosophila NECROTIC (NEC) gene and its homologues in the mammalian system are well-characterized serpins, which play a role in regulating proteases that participate in cell death pathways. Although the Arabidopsis genome contains several serpin homologs, biological function is not known for most of them. Here we show that two Arabidopsis serpins, AtSRP4 and AtSRP5, are closest sequence homologue of Drosophila NEC protein, and are involved in stress-induced cell death and defense...
October 6, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27613446/dehydration-rate-determines-the-degree-of-membrane-damage-and-desiccation-tolerance-in-bryophytes
#18
Ricardo Cruz de Carvalho, Myriam Catalá, Cristina Branquinho, Jorge Marques da Silva, Eva Barreno
Desiccation tolerant (DT) organisms are able to withstand an extended loss of body water and rapidly resume metabolism upon rehydration. This ability, however, is strongly dependent on a slow dehydration rate. Fast dehydration affects membrane integrity leading to intracellular solute leakage upon rehydration and thereby impairs metabolism recovery. We test the hypothesis that the increased cell membrane damage and membrane permeability observed under fast dehydration, compared with slow dehydration, is related to an increase in lipid peroxidation...
October 5, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27701737/isolation-and-functional-characterization-of-cslsi1-a-silicon-transporter-gene-in-cucumis-sativus
#19
Hao Sun, Jia Guo, Yaoke Duan, Tiantian Zhang, Heqiang Huo, Haijun Gong
Cucumber (Cucumis sativus) is a widely grown cucurbitaceous vegetable that exhibits a relatively high capacity for silicon (Si) accumulation, but the molecular mechanism for silicon uptake remains to be clarified. Here we isolated and characterized CsLsi1, a gene encoding a silicon transporter in cucumber (cv. Mch-4). CsLsi1 shares 55.70 and 90.63% homology with the Lsi1s of a monocot and dicot, rice (Oryza sativa) and pumpkin (Cucurbita moschata), respectively. CsLsi1 was predominantly expressed in the roots, and application of exogenous silicon suppressed its expression...
October 4, 2016: Physiologia Plantarum
https://www.readbyqxmd.com/read/27717171/light-quality-and-quantity-regulate-aerobic-methane-emissions-from-plants
#20
Ashley B Martel, Mirwais M Qaderi
Studies have been mounting in support of the finding that plants release aerobic methane (CH4 ), and that these emissions are increased by both short-term and long-term environmental stress. It remains unknown whether or not they are affected by variation in light quantity and quality, whether emissions change over time, and whether they are influenced by physiological parameters. Light is the primary energy source of plants, and therefore an important regulator of plant growth and development. Both shade-intolerant sunflower and shade-tolerant chrysanthemum were investigated for the release of aerobic CH4 emissions, using either low or high light intensity, and varying light quality, including control, low or normal red:far-red ratio (R:FR), and low or high levels of blue, to discern the relationship between light and CH4 emissions...
September 22, 2016: Physiologia Plantarum
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