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Journal of Plant Physiology

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https://www.readbyqxmd.com/read/28431276/enzymatic-activity-gene-expression-and-posttranslational-modifications-of-photosynthetic-and-non-photosynthetic-phosphoenolpyruvate-carboxylase-in-ammonium-stressed-sorghum-plants
#1
Cirenia Arias-Baldrich, Clara de la Osa, Nadja Bosch, Isabel Ruiz-Ballesta, José A Monreal, Sofía García-Mauriño
Sorghum plants grown with 5mM (NH4)2SO4 showed symptoms of stress, such as reduced growth and photosynthesis, leaf chlorosis, and reddish roots. Phosphoenolpyruvate carboxylase (PEPC) activity, by supplying carbon skeletons for ammonium assimilation, plays a pivotal role in tolerance to ammonium stress. This work investigated the effect of ammonium nutrition on PPC and PPCK gene expression, on PEPC activity, and on post-translational modifications (PTMs) of PEPC in leaves and roots of sorghum plants. Ammonium increased PEPC kinase (PEPCk) activity and the phosphorylation state of PEPC in leaves, both in light and in the dark, due to increased PPCK1 expression in leaves...
March 31, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28423307/aspects-of-phosphorus-physiology-associated-with-phosphate-induced-polar-lipid-remodelling-in-marine-microalgae
#2
José Pedro Cañavate, Isabel Armada, Ismael Hachero-Cruzado
Marine microalgae exhibit a diversified phosphorus physiology and have also been recently found to show high inter-taxa variability in their phosphate induced-polar lipids' remodelling. Identification of phosphorus physiology aspects that are more related to lipid remodelling can contribute to better understanding of such intricate phytoplankton lipid metabolism. Therefore, some aspects of phosphorus physiology related to its uptake, storage and use were evaluated in a taxonomically diversified group of nine marine microalgae that was arranged into three subgroups, each of them including species showing similar polar lipid responses to phosphate...
March 31, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28419906/plant-hormone-signaling-in-flowering-an-epigenetic-point-of-view
#3
REVIEW
Gerardo Campos-Rivero, Pedro Osorio-Montalvo, Rafael Sánchez-Borges, Rosa Us-Camas, Fátima Duarte-Aké, Clelia De-la-Peña
Reproduction is one of the most important phases in an organism's lifecycle. In the case of angiosperm plants, flowering provides the major developmental transition from the vegetative to the reproductive stage, and requires genetic and epigenetic reprogramming to ensure the success of seed production. Flowering is regulated by a complex network of genes that integrate multiple environmental cues and endogenous signals so that flowering occurs at the right time; hormone regulation, signaling and homeostasis are very important in this process...
March 31, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28419907/flc-expression-is-down-regulated-by-cold-treatment-in-diplotaxis-tenuifolia-wild-rocket-but-flowering-time-is-unaffected
#4
Jemma L Taylor, Andrea Massiah, Sue Kennedy, Yiguo Hong, Stephen D Jackson
Wild rocket (Diplotaxis tenuifolia) has become a very popular salad leaf due to its peppery taste. It is part of the Brassicaceae family and thus has a high level of homology at the DNA level to other Brassica species including Arabidopsis thaliana. The vernalization and photoperiodic requirements of wild rocket have not been reported to date. Photoperiodic experiments described here demonstrate that rocket is a facultative long day plant. To investigate the vernalization requirement, both seed and young plants were given vernalization treatments at 4°C for different lengths of time...
March 28, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28407490/co2-effects-on-the-waterlogging-response-of-gisela-5-and-gisela-6-prunus-cerasusxprunus-canescens-sweet-cherry-prunus-avium-rootstocks
#5
Margarita Pérez-Jiménez, María Hernández-Munuera, M Carmen Piñero, Gregorio López-Ortega, Francisco M Del Amor
Climate change is submitting countries of the Mediterranean arc to periods of drought alternating with heavy rain and waterlogging. Eventual floods along with the rising CO2 in the atmosphere present an unpredictable scenario that affects crop survival. The effect of both stresses combined has been studied in sweet cherry plants. 'Gisela 5' and 'Gisela 6' were evaluated as rootstocks of the sweet cherry cultivar 'Burlat'. Plants were placed in a controlled-climate chamber for 7days, then they were submitted to waterlogging for another 7days and the response to this stress and the subsequent recovery were studied (7 more days)...
March 28, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28399422/dynamic-expression-reveals-a-two-step-patterning-of-wus-and-clv3-during-axillary-shoot-meristem-formation-in-arabidopsis
#6
Wei Xin, Zhicai Wang, Yan Liang, Yonghong Wang, Yuxin Hu
Seed plants have a remarkable capability to produce axillary meristems (AM) in the leaf axils, however, the dynamic establishment of a stem cell niche in AM is largely uncharacterized. We comprehensively examined the dynamic patterning of WUSCHEL (WUS) and CLAVATA3 (CLV3), the two key marker genes defining the shoot stem cell niches, during AM formation in Arabidopsis, and we found that a two-step patterning of WUS and CLV3 occurred during AM stem cell niche establishment. Our further work on the wus and clv3 mutants implicates that such two-step patterning is likely critical for the maintenance of AM progenitor cells and the specification of AM stem cell niche...
March 28, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28395198/propagation-and-some-physiological-effects-of-citrus-bark-cracking-viroid-and-apple-fruit-crinkle-viroid-in-multiple-infected-hop-humulus-lupulus-l
#7
J Matoušek, K Siglová, J Jakše, S Radišek, Joseph R J Brass, T Tsushima, T Guček, G S Duraisamy, T Sano, G Steger
The hop metabolome important for the brewing industry and for medical purposes is endangered worldwide due to multiple viroid infections affecting hop physiology. Combinatorial biolistic hop inoculation with Citrus bark cracking viroid (CBCVd), Apple fruit crinkle viroid (AFCVd), Hop latent viroid, and Hop stunt viroid (HSVd) showed a low CBCVd compatibility with HSVd, while all other viroid combinations were highly compatible. Unlike to other viroids, single CBCVd propagation showed a significant excess of (-) over (+) strands in hop, tomato, and Nicotiana benthamiana, but not in citruses...
March 27, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28412604/highlighting-the-differential-role-of-leaf-paraheliotropism-in-two-mediterranean-cistus-species-under-drought-stress-and-well-watered-conditions
#8
Giacomo Puglielli, Susana Redondo-Gómez, Loretta Gratani, Enrique Mateos-Naranjo
The differential degree by which paraheliotropism may counterbalance the deleterious impact of high irradiance between congeneric species in relation to different water availabilities has been poorly investigated. We followed the evolution of gas exchange, quenching analysis and OJIP parameters in restrained (R) and free (F) to move leaves of Cistus monspeliensis (CM) and Cistus salvifolius (CS) under drought stress (WS) and well-watered conditions (WW). Concerning gas exchange parameters, leaf restriction effect was overall not significant in CM except in apparent carboxylation efficiency (Ce) under WS, while CS showed a significant sensitivity of maximum net photosynthetic rate (Amax), stomatal conductance (gs) and Ce even under WW...
March 25, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28411489/kale-borack1-is-involved-in-the-plant-response-to-salt-stress-and-peronospora-brassicae-gaumann
#9
Da-Hong Li, Fu-Jia Shen, Hong-Yan Li, Wei Li
The receptor for activated C kinase 1 (RACK1) belongs to a protein subfamily containing a tryptophan-aspartic acid-domain (WD) repeat structure. Compelling evidence indicates that RACK1 can interact with many signal molecules and affect different signal transduction pathways. In this study, a kale (Brassica oleracea var. acephala f.tricolor) RACK1 gene (BoRACK1) was cloned by RT-PCR. The amino acid sequence of BoRACK1 had seven WD repeats in which there were typical GH (glycine-histidine) and WD dipeptides...
March 24, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28423344/prolonged-dark-period-modulates-the-oxidative-burst-and-enzymatic-antioxidant-systems-in-the-leaves-of-salicylic-acid-treated-tomato
#10
Péter Poór, Zoltán Takács, Krisztina Bela, Zalán Czékus, Gabriella Szalai, Irma Tari
Salicylic acid (SA) is an important plant growth regulator playing a role in the hypersensitive reaction (HR) and the induction of systemic acquired resistance. Since the SA-mediated signalling pathways and the formation of reactive oxygen species (ROS) are light-dependent, the time- and concentration-specific induction of oxidative stress was investigated in leaves of tomato plants kept under light and dark conditions after treatments with 0.1mM and 1mM SA. The application of exogenous SA induced early superoxide- and H2O2 production in the leaves, which was different in the absence or presence of light and showed time- and concentration-dependent changes...
March 23, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28412605/brachytic-1-of-barley-hordeum-vulgare-l-encodes-the-%C3%AE-subunit-of-heterotrimeric-g-protein
#11
Ai Ito, Ayumi Yasuda, Kosuke Yamaoka, Minase Ueda, Akira Nakayama, Suguru Takatsuto, Ichiro Honda
Physiological and molecular biological analysis of the dwarf barley (Hordeum vulgare L.) mutant brachytic 1 (brh1) was conducted. The root responses of brh1 to brassinolide were weaker than those of wild type, but the responses of leaf segments of dark-grown plants were not. Responses of brh1 to gibberellin A3 were similar to or slightly stronger than those of wild type. Endogenous levels of these hormones in young seedlings were not clearly different between brh1 and wild type. Skotomorphogeneses of brh1 were similar to those of wild type...
March 23, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28384532/circadian-patterns-of-xylem-sap-properties-and-their-covariation-with-plant-hydraulic-traits-in-hybrid-aspen
#12
Annika Meitern, Eele Õunapuu-Pikas, Arne Sellin
Physiological processes taking place in plants are subject to diverse circadian patterns but some of them are poorly documented in natural conditions. The daily dynamics of physico-chemical properties of xylem sap and their covariation with tree hydraulic traits were investigated in hybrid aspen (Populus tremula L.×P. tremuloides Michx) in field conditions in order to clarify which environmental drivers govern the daily variation in these parameters. K(+) concentration ([K(+)]), electrical conductivity (σsap), osmolality (Osm) and pH of the xylem sap, as well as branch hydraulic traits, were measured in the field over 24-h cycles...
March 22, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28380405/a-modified-gfp-facilitates-counting-membrane-protein-subunits-by-step-wise-photobleaching-in-arabidopsis
#13
Kai Song, Yiqun Xue, Xiaohua Wang, Yinglang Wan, Xin Deng, Jinxing Lin
Membrane proteins exert functions by forming oligomers or molecular complexes. Currently, step-wise photobleaching has been applied to count the fluorescently labelled subunits in plant cells, for which an accurate and reliable control is required to distinguish individual subunits and define the basal fluorescence. However, the common procedure using immobilized GFP molecules is obviously not applicable for analysis in living plant cells. Using the spatial intensity distribution analysis (SpIDA), we found that the A206K mutation reduced the dimerization of GFP molecules...
March 22, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28384531/proteome-analysis-reveals-an-energy-dependent-central-process-for-populus%C3%A3-canadensis-seed-germination
#14
Hong Zhang, Ke-Xin Zhou, Wei-Qing Wang, Shu-Jun Liu, Song-Quan Song
Poplar (Populus×canadensis) seeds rapidly germinated in darkness at 10, 15, and 20°C and reached 50% seed germination after about 22, 4.5, and 3.5h, respectively. Germination of poplar seeds was markedly inhibited by abscisic acid (ABA) at 50μM and cycloheximide (CHX) at 100μM, and these inhibitive roles were temperature-dependent. In the present study, mature poplar seeds were used to investigate the differentially changed proteome of seeds germinating in water, ABA, and CHX. A total of 130 protein spots showed a significant change (1...
March 18, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28363189/identification-and-expression-analysis-of-photoreceptor-genes-in-kiwifruit-leaves-under-natural-daylength-conditions-and-their-relationship-with-other-genes-that-regulate-photoperiodic-flowering
#15
Yolanda Ferradás, Óscar Martínez, Manuel Rey, M Victoria González
Kiwifruit (Actinidia chinensis var. deliciosa (A. Chev) A. Chev.) is a dioecious vine highly dependent on pollination, which is limited by a lack of synchrony of flowering time between male and female plants. In many plant species, the regulation of the timing of flowering depends largely on seasonal cues such as photoperiod, which is detected by photoreceptors. In this report, we determined the full sequences of the PHYB (AcPHYB) and PHYA (AcPHYA) genes and a partial sequence of the CRY2 (AcCRY2) gene in kiwifruit...
March 18, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28364640/blue-light-differentially-represses-mesophyll-conductance-in-high-vs-low-latitude-genotypes-of-populus-trichocarpa-torr-gray
#16
Mina Momayyezi, Robert D Guy
To explore what role chloroplast positioning might have in relation to latitudinal variation in mesophyll conductance (gm) of Populus trichocarpa Torr. & Gray (black cottonwood), we examined photosynthetic response to different blue light treatments in six representative genotypes (three northern and three southern). The proportion of blue (B) to red light was varied from 0:100, 10:90, 20:80, 40:60, and 60:40 while keeping the total photosynthetic photon flux density constant. Mesophyll conductance was estimated by monitoring chlorophyll fluorescence in combination with gas exchange...
March 16, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28324762/chrysanthemum-morphology-photosynthetic-efficiency-and-antioxidant-capacity-are-differentially-modified-by-light-quality
#17
Liang Zheng, Marie-Christine Van Labeke
The effect of light quality on leaf morphology, photosynthetic efficiency and antioxidant capacity of leaves that fully developed under a specific spectrum was investigated in Chrysanthemum cv. Four light treatments were applied at 100μmolm(-2)s(-1) and a photoperiod of 14h using light-emitting diodes, which were 100% red (R), 100% blue (B), 75% red with 25% blue (RB) and white (W), respectively. Intraspecific variation was investigated by studying the response of eight cultivars. Overall, red light significantly decreased the leaf area while the thinnest leaves were observed for W...
March 11, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28388488/genome-wide-identification-of-heat-stress-responsive-small-rnas-in-tall-fescue-festuca-arundinacea-by-high-throughput-sequencing
#18
Huiying Li, Tao Hu, Erick Amombo, Jinmin Fu
MicroRNAs (miRNAs) play vital roles in the adaptive response of plants to various abiotic and biotic stresses. Tall fescue (Festuca arundinacea Schreb.) is a major cool-season forage and turf grass species which is severely influenced by heat stress. To unravel possible heat stress-responsive miRNAs, high-throughput sequencing was employed for heat-tolerant PI578718 and heat-sensitive PI234881 genotypes growing in presence and absence of heat stress (40°C for 36h). By searching against the miRBase database, among 1421 reference monocotyledon miRNAs, more than 850 were identified in all samples...
March 10, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28342331/drought-stress-obliterates-the-preference-for-ammonium-as-an-n-source-in-the-c4-plant-spartina-alterniflora
#19
Kamel Hessini, Herbert J Kronzucker, Chedly Abdelly, Cristina Cruz
The C4 grass Spartina alterniflora is known for its unique salt tolerance and strong preference for ammonium (NH4(+)) as a nitrogen (N) source. We here examined whether Spartina's unique preference for NH4(+) results in improved performance under drought stress. Manipulative greenhouse experiments were carried out to measure the effects of variable water availability and inorganic N sources on plant performance (growth, photosynthesis, antioxidant, and N metabolism). Drought strongly reduced leaf number and area, plant fresh and dry weight, and photosynthetic activity on all N sources, but the reduction was most pronounced on NH4(+)...
March 9, 2017: Journal of Plant Physiology
https://www.readbyqxmd.com/read/28340469/characterization-and-expression-patterns-of-key-c4-photosynthetic-pathway-genes-in-bread-wheat-triticum-aestivum-l-under-field-conditions
#20
Daoura Goudia Bachir, Iqbal Saeed, Quanhao Song, Tay Zar Linn, Liang Chen, Yin-Gang Hu
Wheat is a C3 plant with relatively low photosynthetic efficiency and is a potential target for C4 photosynthetic pathway engineering. Here we reported the characterization of four key C4 pathway genes and assessed their expression patterns and enzymatic activities at three growth stages in flag leaves of 59 bread wheat genotypes. The C4-like genes homologous to PEPC, NADP-ME, MDH, and PPDK in maize were identified in the A, B, and D sub-genomes of bread wheat, located on the long arms of chromosomes 3 and 5 (TaPEPC), short arms of chromosomes 1 and 3 (TaNADP-ME), long arms of chromosomes 1 and 7 (TaMDH), and long arms of chromosome 1 (TaPPDK), respectively...
March 9, 2017: Journal of Plant Physiology
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