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Plant, Cell & Environment

Hai Tao Liu, Fang Yang, Xiao Ying Gong, Rudi Schäufele, Hans Schnyder
Multiannual time series of (palaeo)hydrological information can be reconstructed from the oxygen isotope composition of cellulose (δ(18) OCel ) in biological archives, e.g. tree-rings, but our ability to temporally resolve information at subannual scale is limited. We capitalized on the short and predictable leaf appearance interval (2.4 d) of a perennial C4 grass (Cleistogenes squarrosa), to assess its potential for providing highly time-resolved δ(18) OCel records of vapor pressure deficit (VPD). Plants grown at low (0...
June 23, 2017: Plant, Cell & Environment
Birgit Piechulla, Marie-Chantal Lemfack, Marco Kai
Plants live in association with microorganisms, which are well known as a rich source of specialized metabolits, including volatile compounds. The increasing numbers of described plant microbiomes allowed manifold phylogenetic tree deductions, but less emphasis is presently put on the metabolic capacities of plant-associated microorganisms. With the focus on small volatile metabolites we summarize i) the knowledge of prominent bacteria of plant microbiomes, ii) present the state-of-the-art of individual (discrete) microbial organic and inorganic volatiles affecting plants and fungi, and iii) emphasize the high potential of microbial volatiles in mediating microbe-plant interactions...
June 23, 2017: Plant, Cell & Environment
Pawan Kumar, Rehna Augustine, Amarjeet Kumar Singh, Naveen C Bisht
Differential accumulation of plant defense metabolites has been suggested to have important ecological consequence in the context of plant-insect interactions. Feeding of generalist pests on Brassica juncea showed a distinct pattern with selective exclusion of leaf margins which are high in glucosinolates. Molecular basis of this differential accumulation of glucosinolates could be explained based on differential expression profile of BjuMYB28 homologs, the major biosynthetic regulators of aliphatic glucosinolates, as evident from quantitative real-time PCR and promoter:GUS fusion studies in allotetraploid B...
June 23, 2017: Plant, Cell & Environment
Sebastien Lacube, Christian Fournier, Carine Palaffre, Emilie J Millet, François Tardieu, Boris Parent
Leaf expansion depends on both carbon and water availabilities. In cereals, most of experimental effort has focused on leaf elongation, with essentially hydraulic effects. We have tested if evaporative demand and light could have distinct effects on leaf elongation and widening, and if short term effects could translate into final leaf dimensions. For that, we have monitored leaf widening and elongation in a field experiment with temporary shading, and in a platform experiment with 15-min temporal resolution and contrasting evaporative demands...
June 22, 2017: Plant, Cell & Environment
Virginie Mengin, Eva-Theresa Pyl, Thiago Alexandre Moraes, Ronan Sulpice, Nicole Krohn, Beatrice Encke, Mark Stitt
Photoperiod duration can be predicted from previous days but irradiance fluctuates in an unpredictable manner. To investigate how allocation to starch responds to changes in these two environmental variables, Arabidopsis Col-0 was grown in a 6-h and a 12-h photoperiod at three different irradiances. The absolute rate of starch accumulation increased when photoperiod duration was shortened and when irradiance was increased. The proportion of photosynthate allocated to starch increased strongly when photoperiod duration was decreased but only slightly when irradiance was decreased...
June 19, 2017: Plant, Cell & Environment
Kenneth A Watanabe, Arielle Homayouni, Lingkun Gu, Kuan-Ying Huang, Tuan-Hua David Ho, Qingxi J Shen
Seeds serve as a great model to study plant responses to drought stress, which is largely mediated by abscisic acid (ABA). The ABA responsive element (ABRE) is a key cis-regulatory element in ABA signaling. However, its consensus sequence, (ACGTG(G/T)C), is present in the promoters of only about 40% of ABA induced genes in rice aleurone cells, suggesting other ABREs may exist. To identify novel ABREs, RNA-sequencing was performed on aleurone cells of rice seeds treated with 20 μM ABA. Gibbs sampling was used to identify enriched elements and particle bombardment-mediated transient expression studies were performed to verify the function...
June 18, 2017: Plant, Cell & Environment
Victor Picheny, Pierre Casadebaig, Ronan Trépos, Robert Faivre, David Da Silva, Patrick Vincourt, Evelyne Costes
Numerical plant models can predict the outcome of plant traits modifications resulting from genetic variations, on plant performance, by simulating physiological processes and their interaction with the environment. Optimization methods complement those models to design ideotypes, i.e. ideal values of a set of plant traits resulting in optimal adaptation for given combinations of environment and management, mainly through the maximization of a performance criteria (e.g. yield, light interception). As use of simulation models gains momentum in plant breeding, numerical experiments must be carefully engineered to provide accurate and attainable results, rooting them in biological reality...
June 18, 2017: Plant, Cell & Environment
Shuai Li, Peter C Harley, Ülo Niinemets
Acute ozone exposure triggers major emissions of volatile organic compounds (VOC), but quantitatively, it is unclear how different ozone doses alter the start and the total amount of these emissions, and the induction rate of different stress volatiles. It is also unclear whether priming (i.e., pre-exposure to lower O3 concentrations) can modify the magnitude and kinetics of volatile emissions. We investigated photosynthetic characteristics and VOC emissions in Phaseolus vulgaris following acute ozone exposure (600 nmol mol(-1) for 30 min) under illumination and in darkness and after priming with 200 nmol mol(-1) O3 for 30 min...
June 17, 2017: Plant, Cell & Environment
Jeroni Galmés, Arántzazu Molins, Jaume Flexas, Miquel À Conesa
High photosynthetic efficiency intrinsically demands tight coordination between traits related to CO2 diffusion capacity and leaf biochemistry. Although this coordination constitutes the basis of existing mathematical models of leaf photosynthesis, it has been barely explored among closely related species, which could reveal rapid adaptation clues in the recent past. With this aim, we characterized the photosynthetic capacity of twelve species of Limonium, possessing contrasting Rubisco catalytic properties, grown under optimal (WW) and extreme drought conditions (WD)...
June 16, 2017: Plant, Cell & Environment
Xiao Fang Zhu, Jiang Xue Wan, Qi Wu, Xu Sheng Zhao, Shao Jian Zheng, Ren Fang Shen
Glucuronoxylan (GX), an important component of hemicellulose in the cell wall, appears to affect aluminum (Al) sensitivity in plants. To investigate the role of GX in cell-wall-localized xylan, we examined the Arabidopsis thaliana parvus mutant in detail. This mutant lacks α-D-glucuronic acid (GlcA) side chains in GX and has greater resistance to Al stress than wild-type (WT) plants. The parvus mutant accumulated lower levels of Al in its roots and cell walls than WT despite having cell wall pectin content and pectin methylesterase (PME) activity similar to those of WT...
June 16, 2017: Plant, Cell & Environment
Changpeng Qiu, Gilbert Ethier, Steeve Pepin, Pascal Dubé, Yves Desjardins, André Gosselin
The temperature dependence of mesophyll conductance (gm ) was measured in well-watered red raspberry (Rubus idaeus L.) plants acclimated to leaf-to-air vapour pressure deficit (VPDL) daytime differentials of contrasting amplitude, keeping a fixed diurnal leaf temperature (Tleaf ) rise from 20°C to 35°C. Contrary to the great majority of gm temperature responses published to date, we found a pronounced reduction of gm with increasing Tleaf irrespective of leaf chamber O2 level and diurnal VPDL regime. Leaf hydraulic conductance was greatly enhanced during the warmer afternoon periods under both low (0...
June 15, 2017: Plant, Cell & Environment
Ali Kiani-Pouya, Ute Roessner, Nirupama S Jayasinghe, Adrian Lutz, Thusitha Rupasinghe, Nadia Bazihizina, Jennifer Bohm, Sulaiman Alharbi, Rainer Hedrich, Sergey Shabala
Epidermal bladder cells (EBC) have been postulated to assist halophytes in coping with saline environments. However, little direct supporting evidence is available. Here, Chenopodium quinoa plants were grown under saline conditions for five weeks. One day prior to salinity treatment, EBC from all leaves and petioles were gently removed using a soft cosmetic brush and physiological, ionic and metabolic changes in brushed and non-brushed leaves were compared. Gentle removal of EBC neither initiated wound metabolism nor affected the physiology and biochemistry of control-grown plants but did have a pronounced effect on salt-grown plants, resulting in a salt-sensitive phenotype...
May 30, 2017: Plant, Cell & Environment
Carolien De Cuyper, Sylwia Struk, Lukas Braem, Kris Gevaert, Geert De Jaeger, Sofie Goormachtig
The plant hormones strigolactones are synthesized from carotenoids and signal via the α/β hydrolase DWARF 14 (D14) and the F-box protein MORE AXILLARY GROWTH 2 (MAX2). Karrikins, molecules produced upon fire, share MAX2 for signaling, but depend on the D14 paralog KARRIKIN INSENSITIVE 2 (KAI2) for perception with strong evidence that the MAX2-KAI2 protein complex might also recognize so far unknown plant-made karrikin-like molecules. Thus, the phenotypes of the max2 mutants are the complex consequence of a loss of both D14- and KAI2-dependent signaling, hence the reason why some biological roles, attributed to strigolactones based on max2 phenotypes, could never be observed in d14 or in the strigolactone-deficient max3 and max4 mutants...
May 30, 2017: Plant, Cell & Environment
Edith Muñoz-Parra, Ramón Pelagio-Flores, Javier Raya-González, Guadalupe Salmerón-Barrera, León Francisco Ruiz-Herrera, Eduardo Valencia-Cantero, José López-Bucio
Transcriptional regulation of gene expression influences plant growth, environmental interactions, and plant-plant communication. Here, we report that population density is a key factor for plant productivity and a major root architectural determinant in Arabidopsis thaliana. When grown in soil at varied densities from 1 to 32 plants, high number of individuals decreased stem growth and accelerated senescence, which negatively correlated with total plant biomass and seed production at the completion of the life cycle...
May 27, 2017: Plant, Cell & Environment
Weronika Czarnocka, Katrien Van Der Kelen, Patrick Willems, Magdalena Szechynska-Hebda, Sara Shahnejat-Bushehri, Salma Balazadeh, Anna Rusaczonek, Bernd Mueller-Roeber, Frank Van Breusegem, Stanisław Karpinski
Since its discovery over two decades ago as an important cell death regulator in Arabidopsis thaliana, the role of LESION SIMULATING DISEASE 1 (LSD1) has been studied intensively within both biotic and abiotic stress responses as well as with respect to plant fitness regulation. However, its molecular mode of action remains enigmatic. Here we demonstrate that nucleo-cytoplasmic LSD1 interacts with a broad range of other proteins that are engaged in various molecular pathways such as ubiquitination, methylation, cell cycle control, gametogenesis, embryo development and cell wall formation...
May 27, 2017: Plant, Cell & Environment
Grace L Miner, William L Bauerle
The Ball-Berry (BB) model of stomatal conductance (gs ) is frequently coupled with a model of assimilation to estimate water and carbon exchanges in plant canopies. The empirical slope (m) and 'residual' gs (g0 ) parameters of the BB model influence transpiration estimates, but the time-intensive nature of measurement limits species-specific data on seasonal and stress responses. We measured m and g0 seasonally and under different water availability for maize and sunflower. The statistical method used to estimate parameters impacted values nominally when inter-plant variability was low, but had substantial impact with larger inter-plant variability...
May 26, 2017: Plant, Cell & Environment
Caroline A Sjogren, Paul B Larsen
A suppressor mutagenesis screen was conducted in order to identify second site mutations that could reverse the extreme hypersensitivity to aluminum (Al) seen for the Arabidopsis mutant, als3-1. From this screen it was found that a loss-of-function mutation in the previously described SUV2 (SENSITIVE TO UV 2), which encodes a putative plant ATRIP homolog that is a component of the ATR-dependent cell checkpoint response, reversed the als3-1 phenotype. This included prevention of hallmarks associated with als3-1 including Al-dependent terminal differentiation of the root tip and transition to endoreduplication...
May 26, 2017: Plant, Cell & Environment
Charlotte Grossiord, Sanna Sevanto, Isaac Borrego, Allison M Chan, Adam D Collins, Lee T Dickman, Patrick J Hudson, Natalie McBranch, Sean T Michaletz, William T Pockman, Max Ryan, Alberto Vilagrosa, Nate G McDowell
Disentangling the relative impacts of precipitation reduction and vapor pressure deficit (VPD) on plant water dynamics and determining whether acclimation may influence these patterns in the future is an important challenge. Here, we report sap flux density (FD ), stomatal conductance (Gs ), hydraulic conductivity (KL ) and xylem anatomy in piñon pine (Pinus edulis) and juniper (Juniperus monosperma) trees subjected to five years of precipitation reduction, atmospheric warming (elevated VPD) and their combined effects...
May 26, 2017: Plant, Cell & Environment
Zhong-Wei Zhang, Sha Luo, Gong-Chang Zhang, Ling-Yang Feng, Chong Zheng, Yang-Hong Zhou, Jun-Bo Du, Ming Yuan, Yang-Er Chen, Chang-Quan Wang, Wen-Juan Liu, Xiao-Chao Xu, Yong Hu, Su-Lan Bai, Dong-Dong Kong, Shu Yuan, Yi-Kun He
Nitric oxide (NO) is extensively involved in various growth processes and stress responses in plants; however, the regulatory mechanism of NO-modulated cellular sugar metabolism is still largely unknown. Here, we report that NO significantly inhibited monosaccharide catabolism by modulating sugar metabolic enzymes through S-nitrosylation (mainly by oxidizing dihydrolipoamide, a cofactor of pyruvate dehydrogenase). These S-nitrosylation modifications led to a decrease in cellular glycolysis enzymes and ATP synthase activities as well as declines in the content of acetyl coenzyme A, ATP, ADP-glucose, and UDP-glucose, which eventually caused polysaccharide-biosynthesis inhibition and monosaccharide accumulation...
May 26, 2017: Plant, Cell & Environment
Artik Elisa Angkawijaya, Van Cam Nguyen, Yuki Nakamura
Upon phosphate starvation, plants retard shoot growth but promote root development presumably to enhance phosphate assimilation from the ground. Membrane lipid remodeling is a metabolic adaptation that replaces membrane phospholipids by non-phosphorous galactolipids, thereby allowing plants to obtain scarce phosphate yet maintain the membrane structure. However, stoichiometry of this phospholipid-to-galactolipid conversion may not account for the massive demand of membrane lipids that enables active growth of roots under phosphate starvation, thereby suggesting the involvement of de novo phospholipid biosynthesis, which is not represented in the current model...
May 26, 2017: Plant, Cell & Environment
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