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https://www.readbyqxmd.com/read/28214728/lipid-signalling-mediated-by-pld-pa-modulates-proline-and-h2o2-levels-in-barley-seedlings-exposed-to-short-and-long-term-chilling-stress
#1
Micaela Peppino Margutti, Matias Reyna, María Verónica Meringer, Graciela E Racagni, Ana Laura Villasuso
Phospholipase D (PLD) hydrolyses phospholipids to yield phosphatidic acid (PA) and a head group, and is involved in responses to a variety of environmental stresses, including chilling and freezing stress. Barley responses to chilling stress (induced by incubating seedlings at 4 °C) are dynamic and the duration of stress, either short (0-180 min) or long-term (24-36 h) had a significant impact on the response. We investigated the roles of PLD/PA in responses of barley (Hordeum vulgare) seedlings to short and long-term chilling stress, based on regulation of proline and reactive oxygen species (ROS) levels...
February 10, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28182638/effect-of-elevated-atmospheric-co2-concentration-on-growth-and-leaf-litter-decomposition-of-quercus-acutissima-and-fraxinus-rhynchophylla
#2
Sangsub Cha, Hee-Myung Chae, Sang-Hoon Lee, Jae-Kuk Shim
The atmospheric carbon dioxide (CO2) level is expected to increase substantially, which may change the global climate and carbon dynamics in ecosystems. We examined the effects of an elevated atmospheric CO2 level on the growth of Quercus acutissima and Fraxinus rhynchophylla seedlings. We investigated changes in the chemical composition of leaf litter, as well as litter decomposition. Q. acutissima and F. rhynchophylla did not show differences in dry weight between ambient CO2 and enriched CO2 treatments, but they exhibited different patterns of carbon allocation, namely, lower shoot/root ratio (S/R) and decreased specific leaf area (SLA) under CO2-enriched conditions...
2017: PloS One
https://www.readbyqxmd.com/read/28176859/alleviation-of-drought-stress-by-mycorrhizas-is-related-to-increased-root-h2o2-efflux-in-trifoliate-orange
#3
Yong-Ming Huang, Ying-Ning Zou, Qiang-Sheng Wu
The Non-invasive Micro-test Technique (NMT) is used to measure dynamic changes of specific ions/molecules non-invasively, but information about hydrogen peroxide (H2O2) fluxes in different classes of roots by mycorrhiza is scarce in terms of NMT. Effects of Funneliformis mosseae on plant growth, H2O2, superoxide radical (O2(·-)), malondialdehyde (MDA) concentrations, and H2O2 fluxes in the taproot (TR) and lateral roots (LRs) of trifoliate orange seedlings under well-watered (WW) and drought stress (DS) conditions were studied...
February 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28167023/the-solanum-lycopersicum-auxin-response-factor-slarf2-participates-in-regulating-lateral-root-formation-and-flower-organ-senescence
#4
Zhenxin Ren, Ruiyuan Liu, Wenting Gu, Xicun Dong
ARF2 as apleiotropic developmental regulator has been reported in Arabidopsis thaliana and tomato (Solanum lycopersicum). The present study showed SlARF2 transcripts in all tomato plant tissues but with higher accumulation in flowers. During bud-anthesis stages, SlARF2 transcripts showed a dynamic expression pattern in sepal, stamen, ovary and petal. Hormone treatment analysis suggested that SlARF2 transcript accumulation was positively regulated by auxin and gibberellic acid, and negatively regulated by ethylene in tomato seedlings...
March 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28165429/the-dynamics-of-the-defense-strategy-of-pea-induced-by-exogenous-nitric-oxide-in-response-to-aphid-infestation
#5
Agnieszka Woźniak, Magda Formela, Piotr Bilman, Katarzyna Grześkiewicz, Waldemar Bednarski, Łukasz Marczak, Dorota Narożna, Katarzyna Dancewicz, Van Chung Mai, Beata Borowiak-Sobkowiak, Jolanta Floryszak-Wieczorek, Beata Gabryś, Iwona Morkunas
The aim of this study was to investigate the effect of exogenous nitric oxide (NO), i.e., S-nitrosoglutathione (GSNO) and sodium nitroprusside (SNP), on the metabolic status of Pisum sativum L. cv. Cysterski leaves infested by Acyrthosiphon pisum Harris, population demographic parameters and A. pisum feeding activity. A reduction in the level of semiquinone radicals in pea seedling leaves pretreated with exogenous NO occurred 24 h after A. pisum infestation, which was earlier than in non-pretreated leaves. A decrease in the level of O₂(•-) was observed in leaves pretreated with GSNO and infested by aphids at 48 and 72 h post-infestation (hpi)...
February 5, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28161909/competition-and-facilitation-may-lead-to-asymmetric-range-shift-dynamics-with-climate-change
#6
Ailene Ettinger, Janneke HilleRisLambers
Forecasts of widespread range shifts with climate change stem from assumptions that climate drives species distributions. However, local adaption and biotic interactions also influence range limits, and thus, may impact range shifts. Despite the potential importance of these factors, few studies have directly tested their effects on performance at range limits. We address how population-level variation and biotic interactions may affect range shifts by transplanting seeds and seedlings of western North American conifers of different origin populations into different competitive neighborhoods within and beyond their elevational ranges and monitoring their performance...
February 4, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28151037/differential-deposition-of-h2a-z-in-rice-seedling-tissue-during-the-day-night-cycle
#7
Kang Zhang, Wenying Xu, Chunchao Wang, Xin Yi, Zhen Su
Chromatin structure has an important role in modulating gene expression. The incorporation of histone variants into the nucleosome leads to important changes in the chromatin structure. The histone variant H2A.Z is highly conserved between different species of fungi, animals, and plants. However, dynamic changes to H2A.Z in rice have been reported during the day-night cycle. In this study, we generated genome wide maps of H2A.Z for day and night time harvested seedling tissues by combining chromatin immunoprecipitation and high-throughput sequencing...
February 2, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28149171/dynamic-response-of-woody-vegetation-on-fencing-protection-in-semi-arid-areas-case-study-pilot-exclosure-on-the-firmihin-plateau-socotra-island
#8
Hana Habrova, Jindrich Pavlis
Woody vegetation dynamics and Dracaena cinnabari regeneration have been studied for five years in the conditions of Socotra Island. Woody plants were measured regularly inside and outside the exclosure area, and the growth and survival of D. cinnabari seedlings were observed. In the exclosure of about 1000 m(2) a total of 49 species were identified, including 23 endemics, growing in the average density of 3.82 specimens per m(2). The fenced area was overgrown relatively rapidly by dense grass cover - reaching approx...
February 2017: Saudi Journal of Biological Sciences
https://www.readbyqxmd.com/read/28148998/clonal-growth-buffers-the-effect-of-grazing-management-on-the-population-growth-rate-of-a-perennial-grassland-herb
#9
Line Johansen, Sølvi Wehn, Knut Anders Hovstad
Grazing is an important management action to conserve biodiversity in semi-natural grasslands but it is important to understand how grazing influences the life-history components and population dynamics of plant species. In this study, we analysed effects of grazing intensity and abandonment on population dynamics of the semi-natural grassland species Knautia arvensis which is an important nectar source for pollinating species and an indicator of biodiversity in agricultural landscapes. We recorded life-history stage, survival, establishment of seedlings and ramets, number of inflorescences and grazing marks on permanently marked individuals in eight populations in mid-Norway for three consecutive years...
August 2016: Flora
https://www.readbyqxmd.com/read/28124256/brassinosteroid-action-in-plant-abiotic-stress-tolerance
#10
Priti Krishna, Bishun D Prasad, Tawhidur Rahman
Brassinosteroids (BRs) are a class of plant steroidal hormones that play essential roles in plant growth and development. Systematic studies had first been undertaken concomitantly to determine both the effects of exogenous BR on stress phenotypes of Arabidopsis thaliana and Brassica napus (rapeseed) seedlings and the expression of stress marker genes in BR-treated and untreated seedlings. When reproducible and convincing evidence of the role of BR in stress tolerance had been obtained, molecular mechanisms underlying the ability of BR to confer tolerance against heat, cold, drought, and salt stress, as well as pathogen resistance were studied with several molecular approaches and tools...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28102913/autumn-photosynthetic-decline-and-growth-cessation-in-seedlings-of-white-spruce-are-decoupled-under-warming-and-photoperiod-manipulations
#11
Joseph R Stinziano, Danielle A Way
Climate warming is expected to increase the seasonal duration of photosynthetic carbon fixation and tree growth in high latitude forests. However photoperiod, a crucial cue for seasonality, will remain constant, which may constrain tree responses to warming. We investigated the effects of temperature and photoperiod on weekly changes in photosynthetic capacity, leaf biochemistry and growth in seedlings of a boreal evergreen conifer, white spruce (Picea glauca (Moench) Voss). Warming delayed autumn declines in photosynthetic capacity, extending the period when seedlings had high carbon uptake...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28102497/regulated-partitioning-of-fixed-carbon-14-c-sodium-na-potassium-k-and-glycine-betaine-determined-salinity-stress-tolerance-of-gamma-irradiated-pigeonpea-cajanus-cajan-l-millsp
#12
Pankaj Kumar, Vasundhara Sharma, Chobhe Kapil Atmaram, Bhupinder Singh
Soil salinity is a major constraint that limits legume productivity. Pigeonpea is a salt sensitive crop. Seed gamma irradiation at a very low dose (2.5 Gy) is known to enhance seedling establishment, plant growth and yield of cereals and other crops. The present study conducted using two genetically diverse varieties of pigeonpea viz., Pusa-991 and Pusa-992 aimed at establishing the role of pre-sowing seed gamma irradiation at 0, 0.0025, 0.005, 0.01, 0.02, 0.05 and 0.1 kGy on plant growth, seed yield and seed quality under salt stress at 0, 80 and 100 mM NaCl (soil solution EC equivalent 1...
January 19, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28102339/effects-of-increased-nitrogen-and-phosphorus-deposition-on-offspring-performance-of-two-dominant-species-in-a-temperate-steppe-ecosystem
#13
Yang Li, Longyu Hou, Bing Song, Liuyi Yang, Linghao Li
Plants adapt to environment by plastic growth which will be transferred to offspring through transgenerational effect. Performance and response of maternal and offspring plant will affect population dynamics and community composition. However, it is scarcely understood how maternal nutrient environment affect the performance and response of offspring through transgenerational effect. Here we studied the impacts of nitrogen (N) and phosphorus (P) enrichment on maternal and offspring performances and responses of Stipa krylovii and Artemisia frigida...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28094046/spatiotemporal-variation-of-arbuscular-mycorrhizal-fungal-colonization-in-olive-olea-europaea-l-roots-across-a-broad-mesic-xeric-climatic-gradient-in-north-africa
#14
Amel Meddad-Hamza, Nabila Hamza, Souad Neffar, Arifa Beddiar, Silvio Gianinazzi, Haroun Chenchouni
This study aims to determine the spatiotemporal dynamics of root colonization and spore density of arbuscular mycorrhizal fungi (AMF) in the rhizosphere of olive trees (Olea europaea) with different plantation ages and under different climatic areas in Algeria. Soil and root samples were seasonally collected from three olive plantations of different ages. Other samples were carried out in productive olive orchards cultivated under a climatic gradient (desertic, semi-arid, subhumid, and humid). The olive varieties analysed in this study were Blanquette, Rougette, Chemlel and the wild-olive...
January 13, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28088026/current-ambient-concentrations-of-ozone-in-panama-modulate-the-leaf-chemistry-of-the-tropical-tree-ficus-insipida
#15
Gerald F Schneider, Alexander W Cheesman, Klaus Winter, Benjamin L Turner, Stephen Sitch, Thomas A Kursar
Tropospheric ozone (O3) is a major air pollutant and greenhouse gas, affecting carbon dynamics, ecological interactions, and agricultural productivity across continents and biomes. Elevated [O3] has been documented in tropical evergreen forests, the epicenters of terrestrial primary productivity and plant-consumer interactions. However, the effects of O3 on vegetation have not previously been studied in these forests. In this study, we quantified ambient O3 in a region shared by forests and urban/commercial zones in Panama and found levels two to three times greater than in remote tropical sites...
April 2017: Chemosphere
https://www.readbyqxmd.com/read/28062752/arabidopsis-seed-mitochondria-are-bioenergetically-active-immediately-upon-imbibition-and-specialize-via-biogenesis-in-preparation-for-autotrophic-growth
#16
Gaël Paszkiewicz, José M Gualberto, Abdelilah Benamar, David Macherel, David C Logan
Seed germination is a vital developmental transition for production of progeny by sexual reproduction in spermatophytes. Quiescent cells in nondormant dry embryos are reawakened first by imbibition and then by perception of germination triggers. Reanimated tissues enter into a germination program requiring energy for expansion growth. However, germination requires that embryonic tissues develop to support the more energy-demanding processes of cell division and organogenesis of the new seedling. Reactivation of mitochondria to supply the required energy is thus a key process underpinning germination and seedling survival...
January 2017: Plant Cell
https://www.readbyqxmd.com/read/28054942/a-comprehensive-proteomic-survey-of-aba-induced-protein-phosphorylation-in-rice-oryza-sativa-l
#17
Jiehua Qiu, Yuxuan Hou, Yifeng Wang, Zhiyong Li, Juan Zhao, Xiaohong Tong, Haiyan Lin, Xiangjin Wei, Hejun Ao, Jian Zhang
abscisic acid (ABA) is a key phytohormone regulating plant development and stress response. The signal transduction of ABA largely relies on protein phosphorylation. However; little is known about the phosphorylation events occurring during ABA signaling in rice thus far. By employing a label-free; MS (Mass Spectrometry)-based phosphoproteomic approach; we identified 2271 phosphosites of young rice seedlings and their intensity dynamics in response to ABA; during which 1060 proteins were found to be differentially phosphorylated...
January 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28052495/life-and-death-of-picea-abies-after-bark-beetle-outbreak-ecological-processes-driving-seedling-recruitment
#18
Martin Macek, Jan Wild, Martin Kopecký, Jaroslav Červenka, Miroslav Svoboda, Jitka Zenáhlíková, Josef Brůna, Reinhard Mosandl, Anton Fischer
The severity and spatial extent of bark-beetle outbreaks substantially increased in recent decades worldwide. The ongoing controversy about natural forest recovery after these outbreaks highlights the need for individual-based long-term studies, which disentangle processes driving forest regeneration. However, such studies have been lacking. To fill this gap, we followed the fates of 2,552 individual seedlings for 12 years after a large-scale bark-beetle outbreak that caused complete canopy dieback in mountain Norway spruce (Picea abies) forests in southeast Germany...
January 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28008701/entire-nucleotide-sequences-of-gossypium-raimondii-and-g-%C3%A2-arboreum-mitochondrial-genomes-revealed-a-genome-species-as-cytoplasmic-donor-of-the-allotetraploid-species
#19
Z Chen, H Nie, C E Grover, Y Wang, P Li, M Wang, H Pei, Y Zhao, S Li, J F Wendel, J Hua
Cotton (Gossypium spp.) is commonly grouped into eight diploid genomic groups, designated A-G and K, and an allotetraploid genomic group, AD. Gossypium raimondii (D5 ) and G. arboreum (A2 ) are the putative contributors to the progenitor of G. hirsutum (AD1 ), the economically important fibre-producing cotton species. Mitochondrial DNA from week-old etiolated seedlings was extracted from isolated organelles using discontinuous sucrose density gradient method. Mitochondrial genomes were sequenced, assembled, annotated and analysed in orderly...
December 23, 2016: Plant Biology
https://www.readbyqxmd.com/read/27974653/effects-of-prolonged-drought-stress-on-scots-pine-seedling-carbon-allocation
#20
Heidi Aaltonen, Aki Lindén, Jussi Heinonsalo, Christina Biasi, Jukka Pumpanen
As the number of drought occurrences has been predicted to increase with increasing temperatures, it is believed that boreal forests will become particularly vulnerable to decreased growth and increased tree mortality caused by the hydraulic failure, carbon starvation and vulnerability to pests following these. Although drought-affected trees are known to have stunted growth, as well as increased allocation of carbon to roots, still not enough is known about the ways in which trees can acclimate to drought...
December 14, 2016: Tree Physiology
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