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Physiologia Plantarum

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https://www.readbyqxmd.com/read/28597961/non-housekeeping-non-essential-groel-chaperonin-has-acquired-novel-structure-and-function-beneficial-under-stress-in-cyanobacteria
#1
REVIEW
Hitoshi Nakamoto, Kouji Kojima
GroELs which are prokaryotic members of the chaperonin/Hsp60 family are molecular chaperones of which Escherichia coli GroEL is a model for subsequent research. The majority of bacterial species including E. coli and Bacillus subtilis have only one essential groEL gene that forms an operon with the co-chaperone groES gene.
June 9, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28593746/long-term-measurements-of-chlorophyll-a-fluorescence-using-the-jip-test-show-that-combined-abiotic-stresses-influence-the-photosynthetic-performance-of-the-perennial-ryegrass-lolium-perenne-in-a-managed-temperate-grassland
#2
Anthony Digrado, Aurélie Bachy, Ahsan Mozaffar, Niels Schoon, Filippo Bussotti, Crist Amelynck, Anne-Catherine Dalcq, Marie-Laure Fauconnier, Marc Aubinet, Bernard Heinesch, Patrick du Jardin, Pierre Delaplace
Several experiments have highlighted the complexity of stress interactions involved in plant response. The impact in field conditions of combined environmental constraints on the mechanisms involved in plant photosynthetic response, however, remains understudied. In a long-term field study performed in a managed grassland, we investigated the photosynthetic apparatus response of the perennial ryegrass (Lolium perenne) to environmental constraints and its ability to recover and acclimatize. Frequent field measurements of chlorophyll ɑ fluorescence (ChlF) were made in order to determine the photosynthetic performance response of a population of L...
June 8, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28591431/autumn-senescence-in-aspen-is-not-triggered-by-day-length
#3
Ingrid H Michelson, Pär K Ingvarsson, Kathryn M Robinson, Erik Edlund, Maria E Eriksson, Ove Nilsson, Stefan Jansson
Autumn senescence in mature aspens, grown under natural conditions, is initiated at almost the same date every year. The mechanism of such precise timing is not understood but we have previously shown that the signal must be derived from light. We studied variation in bud set and autumn senescence in a collection of 116 natural Eurasian aspen (Populus tremula) genotypes, from twelve populations in Sweden and planted in one northern and one southern common garden, to test the hypothesis that onset of autumn senescence is triggered by day length...
June 7, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28581029/carbohydrate-metabolism-in-the-subtending-leaf-cross-acclimates-to-waterlogging-and-elevated-temperature-stress-and-influences-boll-biomass-in-cotton-gossypium-hirsutum
#4
Haimiao Wang, Yinglong Chen, Wei Hu, Shanshan Wang, John L Snider, Zhiguo Zhou
Short-term waterlogging and chronic elevated temperature occur concomitantly in cotton (Gossypium hirsutum) season. While previous research about co-occurring waterlogging and elevated temperature has focused primarily on cotton fiber, no studies have investigated carbohydrate metabolism of the subtending leaf (a major source leaf for boll development) cross-acclimation to aforementioned stressors. To address this, plants were exposed to ambient (31.6/26.5 °C) and elevated (34.1/29.0 °C) temperatures during the whole flowering and boll formation stage, and waterlogging (0 d, 3 d, 6 d) beginning on the day of anthesis...
June 5, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28573759/persistence-of-plant-hormone-levels-in-rice-shoots-grown-under-microgravity-conditions-in-space-its-relationship-to-maintenance-of-shoot-growth
#5
Kazuyuki Wakabayashi, Kouichi Soga, Takayuki Hoson, Toshihisa Kotake, Mikiko Kojima, Hitoshi Sakakibara, Takashi Yamazaki, Akira Higashibata, Noriaki Ishioka, Toru Shimazu, Motoshi Kamada
We investigated the effects of microgravity environment on growth and plant hormone levels in dark-grown rice shoots cultivated in artificial 1 g and microgravity conditions on the International Space Station (ISS). Growth of microgravity-grown shoots was comparable to that of 1 g-grown shoots. Endogenous levels of indole-3-acetic acid (IAA) in shoots remained constant, while those of abscisic acid (ABA), jasmonic acid (JA), cytokinins (CKs), and gibberellins (GAs) decreased during the cultivation period under both conditions...
June 1, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28568609/two-minuses-can-make-a-plus-waterlogging-and-elevated-co2-interactions-in-sweet-cherry-prunus-avium-cultivars
#6
Margarita Pérez-Jiménez, María Hernández-Munuera, M Carmen Piñero, Gregorio López-Ortega, Francisco M Del Amor
The increase in the ambient concentration of CO2 and other greenhouse gases is producing climate events that can compromise crop survival. However, high CO2 concentrations are sometimes able to mitigate certain stresses such as salinity or drought. In this experiment, the effects of waterlogging and CO2 are studied in combination to elucidate the eventual response in sweet cherry trees. For this purpose, four sweet cherry cultivars ('Burlat', 'Cashmere', 'Lapins, and 'New Star') were grafted on a typically hypoxia-tolerant rootstock ('Mariana 2624') and were submitted to waterlogging for 7 days at either ambient CO2 concentration (400 µmol mol(-1) ) or at elevated CO2 (800 µmol mol(-1) )...
June 1, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28547911/from-light-capture-to-metabolic-needs-oxygenic-photosynthesis-is-an-ever-expanding-field-of-study-in-plants-algae-and-cyanobacteria
#7
EDITORIAL
Pierre Cardol, Anja Krieger-Liszkay
Understanding of the molecular mechanisms of photosynthetic electron and proton transports and their regulation in plants and algae in response to changes in environmental conditions is an important issue for fundamental research on photosynthesis, and may extend even to practical applications by identifying important sites for improvement of photosynthesis. The significance and often centrality of regulatory mechanisms of photosynthetic electron transport is well established for processes in plant acclimation...
May 26, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28543596/transcriptional-regulation-of-hormone-synthesis-and-signaling-pathways-by-overexpressing-cytokinin-synthesis-contributes-to-improved-drought-tolerance-in-creeping-bentgrass
#8
Yi Xu, Patrick Burgess, Bingru Huang
The objective of this study was to investigate transcriptomic changes and molecular factors regulated by cytokinins that may contribute to improved drought tolerance in creeping bentgrass (Agrostis stolonifera) overexpressing adenine isopentenyltransferase (ipt). Wild-type (WT) and ipt-transgenic plants were maintained well irrigated or exposed to 21 d of drought stress in growth chambers. Transcriptomic analysis conducted by RNA-seq revealed 661 and 648 up-regulated and 764 and 862 down-regulated drought-responsive genes (DRGs) in the WT and ipt-transgenic plants, respectively, under drought stress using adjusted p-value of 0...
May 24, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28543370/overexpression-of-the-rubisco-activase-gene-improves-growth-and-low-temperature-and-weak-light-tolerance-in-cucumis-sativus-l
#9
Huangai Bi, Peipei Liu, Zhensheng Jiang, Xizhen Ai
Rubisco activase (RCA) is an important enzyme that can catalyze the carboxylation and oxygenation activities of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), which is involved in the photosynthetic carbon reduction cycle. Here, we studied the effects of changes in RCA activity on photosynthesis, growth and development, as well as the chilling tolerance of RCA overexpressing transgenic cucumber (Cucumis sativus) plants. CsRCA overexpression increased the plant height, leaf area and dry matter, and decreased the root/top ratio in transgenic cucumber plants compared with the wild type (WT) plants...
May 22, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28493482/emergence-of-cytochrome-bc-complexes-in-the-context-of-photosynthesis
#10
Daria V Dibrova, Daria N Shalaeva, Michael Y Galperin, Armen Y Mulkidjanian
The cytochrome bc complexes are involved in Q-cycling; they oxidize membrane quinols by high-potential electron acceptors, such as cytochromes or plastocyanin, and generate transmembrane proton gradient. In several prokaryotic lineages, and also in plant chloroplasts, the catalytic core of the cytochrome bc complexes is built of a four-helical cytochrome b that contains three hemes, a three-helical subunit IV, and an iron-sulfur Rieske protein (cytochrome b6 f-type complexes). In other prokaryotic lineages, and also in mitochondria, the cytochrome b subunit is fused with subunit IV, yielding a seven- or eight-helical cytochrome b with only two hemes (cytochrome bc1 -type complexes)...
May 11, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28466470/an-osmotin-from-the-resurrection-plant-tripogon-loliiformis-tlosm-confers-tolerance-to-multiple-abiotic-stresses-in-transgenic-rice
#11
Thi Thuy Trang Le, Brett Williams, Sagadevan Mundree
Osmotin is a key protein associated with abiotic and biotic stress response in plants. In this study, an osmotin from the resurrection plant Tripogon loliiformis (TlOsm) was characterized and functionally analyzed under abiotic stress conditions in T. loliiformis as well as in transgenic Nicotiana tabacum (tobacco) and Oryza sativa (rice) plants. Real-time PCR analysis on mixed elicitor cDNA libraries from T. loliiformis showed that TlOsm was upregulated a thousand-fold during the early stages of osmotic stresses (cold, drought, and salinity) in both shoots and roots but down-regulated in shoots during heat stress...
May 3, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28464254/hydrogen-peroxide-produced-by-nadph-oxidase-a-novel-downstream-signaling-pathway-in-melatonin-induced-stress-tolerance-in-solanum-lycopersicum
#12
Biao Gong, Yanyan Yan, Dan Wen, Qinghua Shi
The beneficial effects of melatonin on abiotic stress have been demonstrated in several plants. However, little is known about the signal transduction pathway of melatonin involved in the plant stress response. Here, we manipulated the melatonin levels in tomato plants through a chemical approach. The roles of melatonin in stress tolerance were studied by assessing the symptoms, chlorophyll fluorescence, and stress-responsive gene expression. Moreover, both chemical and genetic approaches were used to study the roles of hydrogen peroxide (H2 O2 ) in melatonin-induced signal transduction in tomato plants...
May 2, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28444904/a-bell-pepper-cultivar-tolerant-to-chilling-enhanced-nitrogen-allocation-and-stress-related-metabolite-accumulation-in-the-roots-in-response-to-low-root-zone-temperature
#13
Moses Kwame Aidoo, Tal Sherman, Naftali Lazarovitch, Aaron Fait, Shimon Rachmilevitch
Two bell pepper (Capsicum annuum) cultivars, differing in their response to chilling, were exposed to three levels of root-zone temperatures. Gas exchange, shoot and root phenology, and the pattern of change of the central metabolites and secondary metabolites caffeate and benzoate in the leaves and roots were profiled. Low root-zone temperature significantly inhibited gaseous exchange, with a greater effect on the sensitive commercial pepper hybrid (Canon) than on the new hybrid bred to enhance abiotic stress tolerance (S103)...
April 26, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28432686/high-level-of-reduced-glutathione-contributes-to-detoxification-of-lipid-peroxide-derived-reactive-carbonyl-species-in-transgenic-arabidopsis-overexpressing-glutathione-reductase-under-aluminum-stress
#14
Lina Yin, Jun'ichi Mano, Kiyoshi Tanaka, Shiwen Wang, Meijuan Zhang, Xiping Deng, Suiqi Zhang
Lipid peroxide-derived reactive carbonyl species (RCS), generated downstream of reactive oxygen species (ROS), are critical damage-inducing species in plant aluminum (Al) toxicity. In mammals, RCS are scavenged primarily by glutathione (GSH), but in plant Al stress, contribution of GSH to RCS detoxification has not been evaluated. In this study, Arabidopsis plants overexpressing the gene AtGR1 (accession code At3g24170), encoding glutathione reductase (GR), were generated, and their performance under Al stress was examined...
April 21, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28429526/sll1783-a-monooxygenase-associated-with-polysaccharide-processing-in-the-unicellular-cyanobacterium-synechocystis-pcc-6803
#15
Hélder Miranda, Peter Immerzeel, Lorenz Gerber, Katarina Hörnaeus, Sara Bergström Lind, Bagmi Pattanaik, Pia Lindberg, Fikret Mamedov, Peter Lindblad
Cyanobacteria play a pivotal role as the primary producer in many aquatic ecosystems. The knowledge on the interacting processes of cyanobacteria with its environment - abiotic and biotic factors - is still very limited. Many potential exocytoplasmic proteins in the model unicellular cyanobacterium Synechocystis PCC 6803 have unknown functions and their study is essential to improve our understanding of this photosynthetic organism and its potential for biotechnology use. Here we characterize a deletion mutant of Synechocystis PCC 6803, ∆sll1783, a strain that showed a remarkably high light resistance which is related with its lower thylakoid membrane formation...
April 21, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28419460/land-plants-drive-photorespiration-as-higher-electron-sink-comparative-study-of-post-illumination-transient-o2-uptake-rates-from-liverworts-to-angiosperms-through-ferns-and-gymnosperms
#16
Hitomi Hanawa, Kimitsune Ishizaki, Kana Nohira, Daisuke Takagi, Ginga Shimakawa, Takehiro Sejima, Keiichiro Shaku, Amane Makino, Chikahiro Miyake
In higher plants, the electron-sink capacity of photorespiration contributes to alleviation of photoinhibition by dissipating excess energy under conditions when photosynthesis is limited. We addressed the question at which point in the evolution of photosynthetic organisms photorespiration began to function as electron sink and replaced the flavodiiron proteins which catalyze the reduction of O2 at photosystem I in cyanobacteria. Algae do not have a higher activity of photorespiration when CO2 assimilation is limited, and it can therefore not act as an electron sink...
April 17, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28417466/s-nitrosoglutathione-spraying-improves-stomatal-conductance-rubisco-activity-and-antioxidant-defense-in-both-leaves-and-roots-of-sugarcane-plants-under-water-deficit
#17
Neidiquele M Silveira, Fernanda C C Marcos, Lucas Frungillo, Bárbara B Moura, Amedea B Seabra, Ione Salgado, Eduardo C Machado, John T Hancock, Rafael V Ribeiro
Water deficit is a major environmental constraint on crop productivity and performance and nitric oxide (NO) is an important signaling molecule associated with many biochemical and physiological processes in plants under stressful conditions. This study aims to test the hypothesis that leaf spraying of S-nitrosoglutathione (GSNO), an NO donor, improves the antioxidant defense in both roots and leaves of sugarcane plants under water deficit, with positive consequences for photosynthesis. In addition, the role of key photosynthetic enzymes ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and phosphoenolpyruvate carboxylase (PEPC) in maintaining CO2 assimilation of GSNO-sprayed plants under water deficit were evaluated...
April 17, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28401568/a-secreted-chitinase-like-protein-osclp-supports-root-growth-through-calcium-signaling-in-oryza-sativa
#18
Jingni Wu, Yiming Wang, Sang Gon Kim, Ki-Hong Jung, Ravi Gupta, Joonyup Kim, Younghoon Park, Kyu Young Kang, Sun Tae Kim
Chitinases belong to a conserved protein family and play multiple roles in defense, development, and growth regulation in plants. Here, we identified a secreted chitinase-like protein, OsCLP, which functions in rice growth. A T-DNA insertion mutant of OsCLP (osclp) showed significant retardation of root and shoot growth. A comparative proteomic analysis was carried out using root tissue of wild-type and the osclp mutant to understand the OsCLP-mediated rice growth retardation. Results obtained revealed that proteins related to glycolysis (phosphoglycerate kinase), stress adaption (chaperonin) and calcium signaling (calreticulin and CDPK1) were differentially regulated in osclp roots...
April 12, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28393374/nitrate-enhancement-of-cam-activity-in-two-kalancho%C3%A3-species-is-associated-with-increased-vacuolar-proton-transport-capacity
#19
Paula Natália Pereira, James Andrew Charles Smith, Helenice Mercier
Among species that perform CAM photosynthesis, members of the genus Kalanchoë have been studied frequently to investigate the effect of environmental factors on the magnitude of CAM activity. In particular, different nitrogen sources have been shown to influence the rate of nocturnal CO2 fixation and organic-acid accumulation in several species of Kalanchoë. However, there has been little investigation of the interrelationship between nitrogen source (nitrate versus ammonium), concentration, and the activity of the vacuolar proton pumps responsible for driving nocturnal organic-acid accumulation in these species...
April 9, 2017: Physiologia Plantarum
https://www.readbyqxmd.com/read/28393369/why-we-need-to-know-the-structure-of-phosphorylated-chloroplast-light-harvesting-complex-ii
#20
John F Allen
In oxygenic photosynthesis there are two "light states" - adaptations of the photosynthetic apparatus to spectral composition that otherwise favours either Photosystem I or Photosystem II. In chloroplasts of green plants, the transition to light state 2 depends on phosphorylation of apoproteins of a membrane-intrinsic antenna, the chlorophyll-a/b-binding, light-harvesting complex II (LHC II), and on the resulting redistribution absorbed excitation energy from Photosystem II to Photosystem I. The transition to light state 1 reverses these events and requires a phospho-LHC II phosphatase...
April 9, 2017: Physiologia Plantarum
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