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Plant, Cell & Environment

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https://www.readbyqxmd.com/read/28108999/differential-response-of-scots-pine-seedlings-to-variable-intensity-and-ratio-of-r-and-fr-light
#1
Md Abdur Razzak, Sonali Sachin Ranade, Åsa Strand, M R García-Gil
We investigated the response to increasing intensity of red (R) and far-red (FR) light and to a decrease in R:FR ratio in Pinus sylvestris L. (Scots pine) seedling. The results showed that FR-high irradiance response (FR-HIR) for hypocotyl elongation may be present in Scots pine, and that this response is enhanced by increasing light intensity. However, both hypocotyl inhibition and pigment accumulation were more strongly affected by the R light compared to FR light. This is in contrast to previous reports in Arabidopsis thaliana (L...
January 20, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28107563/are-commercial-sweet-cherry-rootstocks-adapted-to-climate-change-short-term-waterlogging-and-co2-effects-on-sweet-cherry-cv-burlat
#2
Margarita Pérez-Jiménez, María Hernández-Munuera, M Carmen Piñero, Gregorio López-Ortega, Francisco M Del Amor
High CO2 is able to ameliorate some negative effects due to climate change and intensify others. This study involves the sweet cherry (Prunus avium) cultivar 'Burlat' grafted on the 'Mariana 2624', 'Adara' and 'LC 52' rootstocks. In a climate chamber at two CO2 concentrations: ambient (400 µmol mol(-1) ) and elevated (800 µmol mol(-1) ), the plants were submitted to waterlogging for seven days, followed by seven days of recovery after drainage. Waterlogging drastically decreased the rate of photosynthesis, significantly endangering plant survival, particularly for the 'LC 52' and 'Adara' rootstocks...
January 20, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28105656/metabolic-reprogramming-in-response-to-cold-stress-is-like-real-estate-it-s-all-about-location
#3
Vaughan Hurry
No abstract text is available yet for this article.
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28103637/exploiting-cell-cycle-inhibitor-genes-of-the-krp-family-to-control-root-knot-nematode-induced-feeding-sites-in-plants
#4
Roberta Ramos Coelho, Paulo Vieira, José Dijair Antonino de Souza Júnior, Cristina Martin-Jimenez, Lieven De Veylder, Julie Cazareth, Gilbert Engler, Maria Fatima Grossi-de-Sa, Janice de Almeida Engler
Cell cycle control in galls provoked by root-knot nematodes involves the activity of inhibitor genes like the Arabidopsis ICK/KRP members. Ectopic KRP1, KRP2 and KRP4 expression resulted in decreases gall size by inhibiting mitotic activity, whereas KRP6 induces mitosis in galls. Herein, we investigate the role of KRP3, KRP5 and KRP7 during gall development and compared their role with previously studied members of this class of cell cycle inhibitors. Overexpression of KRP3 and KRP7 resulted in undersized giant cells, with KRP3(OE) galls presenting peculiar elongated giant cells...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28103403/a-possible-role-for-ft-encoding-genes-in-interpreting-environmental-and-internal-cues-affecting-olive-olea-europaea-l-flower-induction
#5
Amnon Haberman, Ortal Bakhshian, Sergio Cerezo-Medina, Judith Paltiel, Chen Adler, Giora Ben-Ari, Jose Angel Mercado, Fernando Pliego-Alfaro, Shimon Lavee, Alon Samach
Olive (Olea europaea L.) inflorescences, formed in lateral buds, flower in spring. However, there is some debate regarding time of flower induction and inflorescence initiation. Olive juvenility and seasonality of flowering were altered by overexpressing genes encoding FLOWERING LOCUS T (FT). OeFT1 and OeFT2 caused early flowering under short days when expressed in Arabidopsis. Expression of OeFT1/2 in olive leaves and OeFT2 in buds increased in winter, while initiation of inflorescences occurred in late winter...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28102913/autumn-photosynthetic-decline-and-growth-cessation-in-seedlings-of-white-spruce-are-decoupled-under-warming-and-photoperiod-manipulations
#6
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/28102911/glutathione-peroxidase-like-enzymes-cover-five-distinct-cell-compartments-and-membrane-surfaces-in-arabidopsis-thaliana
#7
Safira Attacha, David Solbach, Krisztina Bela, Anna Moseler, Stephan Wagner, Markus Schwarzländer, Isabel Aller, Stefanie J Müller, Andreas J Meyer
Glutathione peroxidase-like enzymes (GPXLs) constitute a family of eight peroxidases in Arabidopsis thaliana. In contrast to the eponymous selenocysteine glutathione peroxidases (GPXs) in mammalian cells which use glutathione as electron donor, GPXLs rely on cysteine instead of selenocysteine for activity and depend on the thioredoxin system for reduction. Although plant GPXLs have been implicated in important agronomic traits such as drought tolerance, photooxidative tolerance and immune responses there remain major ambiguities regarding their subcellular localization...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28102910/arabidopsis-phosphoinositide-specific-phospholipase-c-4-negatively-regulates-seedling-salt-tolerance
#8
Keke Xia, Bo Wang, Jiewei Zhang, Yuan Li, Hailian Yang, Dongtao Ren
Previous physiological and pharmacological studies have suggested that the activity of phosphoinositide-specific phospholipase C (PI-PLC) plays an important role in regulating plant salt stress responses by altering the intracellular Ca(2+) concentration. However, the individual members of plant PLCs involved in this process need to be identified. Here, the function of AtPLC4 in the salt stress response of Arabidopsis seedlings was analyzed. plc4 mutant seedlings showed hyposensitivity to salt stress compared with Col-0 wild-type seedlings, and the salt hyposensitive phenotype could be complemented by the expression of native promoter-controlled AtPLC4...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28102581/molecular-mechanisms-and-ecological-function-of-far-red-light-signalling
#9
REVIEW
David J Sheerin, Andreas Hiltbrunner
Land plants possess the ability to sense and respond to far-red light (700-760 nm), which serves as an important environmental cue. Due to the nature of far-red light, it is not absorbed by chlorophyll and thus is enriched in canopy shade, and will also penetrate deeper into soil than other visible wavelengths. Far-red light responses include regulation of seed germination, suppression of hypocotyl growth, induction of flowering, and accumulation of anthocyanins, which depend on one member of the phytochrome photoreceptor family, phytochrome A (phyA)...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28102548/the-shade-avoidance-syndrome-multiple-signals-and-ecological-consequences
#10
REVIEW
Carlos L Ballaré, Ronald Pierik
Plants use photoreceptor proteins to detect the proximity of other plants and to activate adaptive responses. Of these photoreceptors, phytochrome B (phyB), which is sensitive to changes in the red (R) to far-red (FR) ratio of sunlight, is the one that has been studied in greatest detail. The molecular connections between the proximity signal (low R:FR) and a model physiological response (increased elongation growth) have now been mapped in considerable detail in Arabidopsis seedlings. We briefly review our current understanding of these connections, and discuss recent progress in establishing the roles of other photoreceptors in regulating growth-related pathways in response to competition cues...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28102545/-rice-calcium-dependent-protein-kinase-oscpk17-targets-plasma-membrane-intrinsic-protein-and-sucrose-phosphate-synthase-and-is-required-for-a-proper-cold-stress-response
#11
M Cecília Almadanim, Bruno M Alexandre, Margarida T G Rosa, Helena Sapeta, António E Leitão, José C Ramalho, TuKiet T Lam, Sónia Negrão, Isabel A Abreu, M Margarida Oliveira
Calcium-dependent protein kinases (CDPKs) are involved in plant tolerance mechanisms to abiotic stresses. Although CDPKs are recognized as key messengers in signal transduction, the specific role of most members of this family remains unknown. Here we test the hypothesis that OsCPK17 plays a role in rice cold stress response by analyzing OsCPK17 knockout, silencing, and overexpressing rice lines under low temperature. Altered OsCPK17 gene expression compromises cold tolerance performance, without affecting the expression of key cold stress-inducible genes...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28102542/silicon-promotes-cytokinin-biosynthesis-and-delays-senescence-in-arabidopsis-and-sorghum
#12
Oshry Markovich, Evyatar Steiner, Štěpán Kouřil, Petr Tarkowski, Asaph Aharoni, Rivka Elbaum
Silicate minerals are dominant soil components. Thus, plant roots are constantly exposed to silicic acid. High silicon intake, enabled by root silicon transporters, correlates with increased tolerance to many biotic and abiotic stresses. However, the underlying protection mechanisms are largely unknown. Here, we tested the hypothesis that silicon interacts with the plant hormones, and specifically, that silicic acid intake increases cytokinin biosynthesis. The reaction of sorghum (Sorghum bicolor) and Arabidopsis plants, modified to absorb high versus low amounts of silicon, to dark-induced senescence was monitored, by quantifying expression levels of genes along the senescence pathway and measuring tissue cytokinin levels...
January 19, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28098350/endogenous-circadian-rhythms-in-pigment-composition-induce-changes-in-photochemical-efficiency-in-plant-canopies
#13
José Ignacio García-Plazaola, Beatriz Fernández-Marín, Juan Pedro Ferrio, Josu G Alday, Günter Hoch, Damien Landais, Alexandru Milcu, David T Tissue, Jordi Voltas, Arthur Gessler, Jacques Roy, Víctor Resco de Dios
There is increasing evidence that the circadian clock is a significant driver of photosynthesis that becomes apparent when environmental cues are experimentally held constant. We studied whether the composition of photosynthetic pigments is under circadian regulation, and whether pigment oscillations lead to rhythmic changes in photochemical efficiency. To address these questions, canopies of bean and cotton were maintained, after an entrainment phase, under constant (light or darkness) conditions for 30-48 h...
January 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28098349/ectopic-expression-of-two-areb-abf-orthologs-increase-dehydration-tolerance-in-cotton-gossypium-hirsutum
#14
Tyson C C Kerr, Haggag Abdel-Mageed, Lorenzo Aleman, Joohyun Lee, Paxton Payton, Dakota Cryer, Randy D Allen
Plants have evolved complex molecular, cellular, and physiological mechanisms to respond to environmental stressors. Due to the inherent complexity of this response, genetic manipulation to substantially improve water deficit tolerance, particularly in agricultural crops, has been largely unsuccessful, as the improvements are frequently accompanied by slower growth and delayed reproduction. Here, we ectopically express two abiotic stress responsive bZIP AREB/ABF transcription factor orthologs, Arabidopsis ABF3 and a Gossypium hirsutum ABF2D, in G...
January 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28098347/evolutionary-origin-of-phytochrome-responses-and-signaling-in-land-plants
#15
REVIEW
Keisuke Inoue, Ryuichi Nishihama, Takayuki Kohchi
Phytochromes comprise one of the major photoreceptor families in plants, and they regulate many aspects of plant growth and development throughout the plant life cycle. A canonical land plant phytochrome originated in the common ancestor of streptophytes. Phytochromes have diversified in seed plants and some basal land plants due to lineage-specific gene duplications that occurred during the course of land plant evolution. Molecular genetic analyses using Arabidopsis thaliana suggested that there are two types of phytochromes in angiosperms, light-labile type I and light-stable type II, which have different signaling mechanisms and which regulate distinct responses...
January 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28098343/mn-accumulation-in-a-submerged-plant-egeria-densa-hydrocharitaceae-is-mediated-by-epiphytic-bacteria
#16
Kousuke Tsuji, Takuma Asayama, Nozomi Shiraki, Shota Inoue, Erina Okuda, Chizuru Hayashi, Kazuma Nishida, Hiroshi Hasegawa, Emiko Harada
Many aquatic plants act as biosorbents, removing and recovering metals from the environment. To assess the biosorbent activity of Egeria densa, a submerged freshwater macrophyte, plants were collected monthly from a circular drainage area in Lake Biwa basin and the Mn concentrations of the plants were analyzed. Mn concentrations in these plants were generally above those of terrestrial hyperaccumulators, and were markedly higher in spring and summer than in autumn. Mn concentrations were much lower in plants incubated in hydroponic medium at various pH levels with and without Mn supplementation than in field-collected plants...
January 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28098339/the-effect-of-blue-light-on-stomatal-oscillations-and-leaf-turgor-pressure-in-banana-leaves
#17
Yotam Zait, Or Shapira, Amnon Schwartz
Stomatal oscillations are cyclic opening and closing of stomata, presumed to initiate from hydraulic mismatch between leaf water supply and transpiration rate. To test this assumption, mismatches between water supply and transpiration were induced using manipulations of VPD (vapor pressure deficit) and light spectrum in banana (Musa acuminata). Simultaneous measurements of gas exchange with changes in leaf turgor pressure were used to describe the hydraulic mismatches. An increase of VPD above a certain threshold, caused stomatal oscillations with variable amplitudes...
January 18, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28070891/a-rop2-ric1-pathway-fine-tunes-microtubule-reorganisation-for-salt-tolerance-in-arabidopsis
#18
Changjiang Li, Hanmei Lu, Wei Li, Ming Yuan, Ying Fu
The biphasic reorganisation of microtubules induced by salt stress is required for Arabidopsis survival under high salinity conditions, however, the underlying regulatory mechanism is poorly understood. In this study, we demonstrate that microtubule associated protein RIC1 has a negative effect on the microtubule reassembly phase under salt stress, and activated ROP2 contributes to the microtubule reorganisation at least partially by releasing the inhibitory effect of RIC1 on microtubule recovery. Our finding not only reveals a new regulatory mechanism for biphasic microtubule reorganisation under salt stress but also the importance of ROP signaling for salinity tolerance in Arabidopsis...
January 9, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28060998/arbuscular-mycorrhizal-symbiosis-with-arundo-donax-decreases-root-respiration-and-increases-both-photosynthesis-and-plant-biomass-accumulation
#19
Antònia Romero-Munar, Néstor Fernández Del-Saz, Miquel Ribas-Carbó, Jaume Flexas, Elena Baraza, Igor Florez-Sarasa, Alisdair Robert Fernie, Javier Gulías
The effect of arbuscular mycorrhiza (AM) symbiosis on plant growth is associated with the balance between costs and benefits. A feedback regulation loop has been described in which the higher carbohydrate cost to plants for AM symbiosis is compensated by increases in their photosynthetic rates. Nevertheless, plant carbon balance depends both on photosynthetic carbon uptake and respiratory carbon consumption. The hypothesis behind this research was that the role of respiration in plant growth under AM symbiosis may be as important as that of photosynthesis...
January 6, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28058744/expression-of-the-uvr8-photoreceptor-in-different-tissues-reveals-tissue-autonomous-features-of-uv-b-signalling
#20
Péter Bernula, Carlos Daniel Crocco, Adriana Beatriz Arongaus, Roman Ulm, Ferenc Nagy, András Viczián
The Arabidopsis UV-B photoreceptor UV RESISTANCE LOCUS 8 (UVR8) orchestrates the expression of hundreds of genes, many of which can be associated with UV-B tolerance. UV-B does not efficiently penetrate into tissues, yet UV-B regulates complex growth and developmental responses. To unravel to what extent and how UVR8 located in different tissues contributes to UV-B-induced responses, we expressed UVR8 fused to the YELLOW FLUORESCENT PROTEIN (YFP) under the control of tissue-specific promoters in a uvr8 null mutant background...
January 6, 2017: Plant, Cell & Environment
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