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seedling dynamic

Marie-Francoise Noirot-Gros, Shalaka Shinde, Peter E Larsen, Sarah Zerbs, Peter J Korajczyk, Kenneth M Kemner, Philippe H Noirot
Rhizosphere-associated Pseudomonas fluorescens are known plant growth promoting (PGP) and mycorrhizal helper bacteria (MHB) of many plants and ectomycorrhizal fungi. We investigated the spatial and temporal dynamics of colonization of mycorrhizal and non-mycorrhizal Aspen seedlings roots by the P. fluorescens strains SBW25, WH6, Pf0-1, and the P. protegens strain Pf-5. Seedlings were grown in laboratory vertical plates systems, inoculated with a fluorescently labeled Pseudomonas strain, and root colonization was monitored over a period of 5 weeks...
2018: Frontiers in Microbiology
Chunying Yin, Sari Palmroth, Xueyong Pang, Bo Tang, Qing Liu, Ram Oren
A pot experiment was conducted to investigate the effects of nitrogen (N) addition (0, 20, 40 g N m-2 year-1, N0, N20, N40, respectively) on the growth, and biomass accumulation and allocation of coniferous and deciduous (Picea asperata Mast. and Betula albosinensis Burk.) seedlings under a range of soil moisture limitation (40%, 50%, 60%, 80% and 100% of field capacity, FC). At 100% FC, growth of shade-tolerant P. asperata increased with N supply, while that of shade-intolerant B. albosinensis reached a maximum at N20, declining somewhat thereafter...
May 16, 2018: Tree Physiology
Yanan Wan, Aboubacar Younoussa Camara, Yao Yu, Qi Wang, Tianliang Guo, Lina Zhu, Huafen Li
Cadmium (Cd) in rice grains is a potential threat to human health. This study investigated the effects of selenite fertilisation (0 mg kg-1 , 0.5 mg kg-1 , and 1.0 mg kg-1 ) on soil solution Cd dynamics and rice uptake. Rice was grown in two Cd-contaminated soils in Jiangxi and Hunan Provinces under two different sets of conditions: aerobic and flooded. The experiments were conducted in pots. The plants were harvested at the seedling stage and at maturity to determine their Cd levels. Soil solutions were also extracted during the growing season to monitor Cd dynamics...
May 11, 2018: Environmental Pollution
Peng Li, Yongchun Li, Jialiang Shi, Zhibo Yu, Aihu Pan, Xueming Tang, Feng Ming
The objective of this study was to characterize the diversity and dynamics of rhizosphere bacterial community, especially the response of dominant and rare bacterial taxa to the cultivation of Bt cotton for different root environments at different growth stages. qPCR analyses indicated that bacterial abundances of the taproots and lateral root rhizospheres of the Bt cotton SGK321 were significantly different at seedling and bolling stages. But no significant differences were detected between the same root zones from Bt and the conventional cotton varieties...
May 8, 2018: Science of the Total Environment
Jing Wang, Qiao Ling Yan
Disturbances commonly exist in forest ecosystems and play a critical role in the forest regeneration and succession. Animal-mediated seed dispersal is an essential stage of seed regeneration for most plants. To some extent, the responses of animal-mediated seed dispersal to forest disturbances can predict the changes in community composition and structure, and consequently, the succession direction of forests. In the present study, we systematically discussed the ecological significance of the effects of disturbances on animal-mediated seed dispersal effectiveness (i...
May 18, 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Xiao-Zhang Yu, Yu-Juan Lin, Chun-Jiao Lu, Dharmendra K Gupta
Plants exhibit highly coordinated, dynamic reactions to various abiotic stressors. As cyanide is a non-essential element for plant growth, entry inside plants can exert toxicity at multiple levels. In plant, hormone plays a pivot role under stress conditions. The fluctuations of stress-responsive hormones help in altering cellular dynamics and hence play a central role in coordination and adaptation growth responses under stress. This study focusses on uptake of cyanide in Oryza sativa seedlings and its effect on physiological and on genetic level...
May 7, 2018: Environmental Science and Pollution Research International
Peng Zhan Li, Li Wang, Di Wang
Soil reservoir is the basis of stable grain production and sustainable development in dry farming area. Based on the long-term field experiment, this paper investigated the changes of soil moisture in wheat field located in the rain-fed Changwu Tableland, and analyzed the interannual and annual variation characteristics and dynamics trends of soil reservoir from 2012 to 2015. The results showed that the vertical distribution curves of average soil water content were double peaks and double valleys: first peak and valley occurred in the 10-20 and 50 cm soil layer, respectively, while for the second peak and valley, the corresponding soil layer was the 100 and 280 cm soil layer...
November 2017: Ying Yong Sheng Tai Xue Bao, the Journal of Applied Ecology
Jia Yang, Caili Wu, Yahui Yu, Huiping Mao, Yuying Bao, Yan Kang, Zhi Qi
Stress-adapted wild plants are natural sources of novel genes for molecular breeding. Here, we conducted a transcriptional analysis of Pinus sylvestris var. mongolica Litv, an evergreen pine in northeastern China, to identify a novel CALMODULIN-LIKE protein-encoding gene, PsCML1, no significant homologs found in other plant species. PsCML1 encodes a protein predicted to have a single trans-membrane domain at its N-terminal. Four EF-hand motifs (calcium [Ca]-binding structures) are located at its C-terminal and showed Ca2+ -specific affinity in isothermal titration calorimetric analysis...
April 18, 2018: Journal of Plant Physiology
Malak A Esseili, Tea Meulia, Linda J Saif, Qiuhong Wang
Lettuce has been implicated in human norovirus (HuNoV) outbreaks. The virus is stable on the leaf surface for at least 2 weeks; however, the dynamics of virus internalization has not been fully investigated. The purpose of this study was to assess the internalization and distribution of HuNoV and two surrogate viruses, porcine sapovirus SaV and Tulane virus (TV), in lettuce and spinach. Viral inoculations through the roots of seedlings and the petiole of leaves from mature plants were performed and the viruses were tracked on day 1 and 6 post-root inoculation and on 16h and 72h post petiole-inoculation...
April 6, 2018: Applied and Environmental Microbiology
Florian Delerue, Maya Gonzalez, David L Achat, Luc Puzos, Laurent Augusto
The importance of competition in low productive habitats is still debated. Studies which simultaneously evaluate preemption of resources and consequences for population dynamics are needed for a comprehensive view of competitive outcomes. We cultivated two emblematic species of European heathlands (Calluna vulgaris and Molinia caerulea) in a nursery for 2 years at two fertility levels, reproducing the productivity gradient found in phosphorus (P)-depleted heathlands in southwest France. The second year, we planted Ulex europaeus seedlings, a ubiquitous heathland species, under the cover of the two species to evaluate its ability to regenerate...
March 24, 2018: Oecologia
Xianling Wang, Lu Wang, Yu Wang, Huan Liu, Dan Hu, Ning Zhang, Shaobin Zhang, Huiying Cao, Qijiang Cao, Zhihong Zhang, Shuang Tang, Dandan Song, Che Wang
Chilling stress affects plant growth and productivity. However, the multi-underlying mechanisms of chilling tolerance are not well understood. Arabidopsis PCaP2 is involved in regulating the dynamic of microtubules (MTs) and F-actin and Ca2+ -binding ability. Here, the results showed that the PCaP2 expression was highly induced in roots, cotyledons, true leaves, lateral roots and flowers under cold stress. Compared with the wild type, PCaP2 -overexpressing plants displayed the enhanced tolerance, whereas its RNAi and mutant were more sensitive in seed germination, seedling and reproductive growth under chilling stress in Arabidopsis...
2018: Frontiers in Plant Science
Lindsay D Leverett, George F Schieder, Kathleen Donohue
PREMISE OF THE STUDY: Phenology, the seasonal timing of development, can alter biotic interactions. Emergence from dormant or quiescent stages often occurs earlier when neighbors are present, which may reduce the neighbors' competitive effects. Delayed emergence in response to neighbors also has been observed, but the potential benefits of such delays are unclear. Further, emergence time may respond to neighbors experienced by parents, which may predict future competition in offspring...
January 2018: American Journal of Botany
Victoria Moriconi, Melanie Binkert, Cecilia Costigliolo, Romina Sellaro, Roman Ulm, Jorge J Casal
Sunflecks, transient patches of light that penetrate through gaps in the canopy and transiently interrupt shade, are eco-physiologically and agriculturally important sources of energy for carbon gain, but our molecular understanding of how plant organs perceive and respond to sunflecks through photoreceptors remains limited. The UV-B photoreceptor UV RESISTANCE LOCUS8 (UVR8) is a recent addition to the list of plant photosensory receptors, and we have made considerable advances in our understanding of the physiology and molecular mechanisms of action of UVR8 and its signaling pathway...
May 2018: Plant Physiology
Yanan Wan, Aboubacar Younoussa Camara, Qingqing Huang, Yao Yu, Qi Wang, Huafen Li
The accumulation of arsenic (As) in rice grain is a potential threat to human health. Our study investigated the possible mediatory role of selenite fertilization on As uptake and accumulation by rice (Oryza sativa L.) under different water management regimes (aerobic or flooded) in a pot experiment. Soil solutions were also extracted during the growing season to monitor As dynamics. Results showed that As contents in the soil solutions, seedlings, and mature rice were higher under flooded than under aerobic water management...
July 30, 2018: Ecotoxicology and Environmental Safety
Viktor Tokan, Janka Puterova, Matej Lexa, Eduard Kejnovsky
BACKGROUND: Many studies have shown that guanine-rich DNA sequences form quadruplex structures (G4) in vitro but there is scarce evidence of guanine quadruplexes in vivo. The majority of potential quadruplex-forming sequences (PQS) are located in transposable elements (TEs), especially close to promoters within long terminal repeats of plant LTR retrotransposons. RESULTS: In order to test the potential effect of G4s on retrotransposon expression, we cloned the long terminal repeats of selected maize LTR retrotransposons upstream of the lacZ reporter gene and measured its transcription and translation in yeast...
March 6, 2018: BMC Genomics
Fang Hui, Jinyu Zhu, Pengcheng Hu, Lei Meng, Binglin Zhu, Yan Guo, Baoguo Li, Yuntao Ma
Background and Aims: Global agriculture is facing the challenge of a phenotyping bottleneck due to large-scale screening/breeding experiments with improved breeds. Phenotypic analysis with high-throughput, high-accuracy and low-cost technologies has therefore become urgent. Recent advances in image-based 3D reconstruction offer the opportunity of high-throughput phenotyping. The main aim of this study was to quantify and evaluate the canopy structure of plant populations in two and three dimensions based on the multi-view stereo (MVS) approach, and to monitor plant growth and development from seedling stage to fruiting stage...
March 2, 2018: Annals of Botany
E S Yando, M J Osland, M W Hester
Ecotone dynamics and shifting range limits can be used to advance our understanding of the ecological implications of future range expansions in response to climate change. In the northern Gulf of Mexico, the salt marsh-mangrove ecotone is an area where range limits and ecotone dynamics can be studied in tandem as recent decreases in winter temperature extremes have allowed for mangrove expansion at the expense of salt marsh. In this study, we assessed aboveground and belowground plant-soil dynamics across the salt marsh-mangrove ecotone quantifying micro-spatial patterns in horizontal extent...
May 2018: Oecologia
Jette Reeg, Simon Heine, Christine Mihan, Thomas G Preuss, Sean McGee, Florian Jeltsch
Current herbicide risk assessment guidelines for nontarget terrestrial plants require testing effects on young, vulnerable life stages (i.e., seedling emergence [and subsequent growth] and vegetative vigor [growth and dry wt]) but not directly on the reproduction of plants. However, the European Food Safety Authority (EFSA) has proposed that effects on reproduction might be considered when evaluating the potential effects on plants. We adapted the plant community model for grassland (IBC-grass) to give insight into the current debate on the sensitivity of reproductive versus vegetative endpoints in ecological risk assessment...
February 26, 2018: Environmental Toxicology and Chemistry
Raquel Azevedo, Eleazar Rodriguez, Rafael José Mendes, Nuno Mariz-Ponte, Sara Sario, José Carlos Lopes, José Miguel P Ferreira de Oliveira, Conceição Santos
Inorganic Mercury (Hg) contamination persists an environmental problem, but its cyto- and genotoxicity in plants remains yet unquantified. To determine the extent of Hg-induced cyto- and genotoxicity, and assess most sensitive endpoints in plants, Pisum sativum L. seedlings were exposed for 14 days to different HgCl2 concentrations up to 100 μM. Shoots and roots from hydroponic exposure presented growth impairment and/or morphological disorders for doses >1 μM, being the roots more sensitive. Plant growth, ploidy changes, clastogenicity (HPCV), cell cycle dynamics (G1 -S-G2 ), Comet-tail moment (TM), Comet-TD, Mitotic-index (MI) and cell proliferation index (CPI) were used to evaluate Hg-induced cyto/genotoxicity...
April 2018: Plant Physiology and Biochemistry: PPB
Krystal A Nunes, Peter M Kotanen
Most research examining how herbivores and pathogens affect performance of invasive plants focuses on aboveground interactions. Although important, the role of belowground communities remains poorly understood, and the relative impact of aboveground and belowground interactions is still debated. As well, most studies of belowground interactions have been carried out in controlled environments, so little is known about the role of these interactions under natural conditions or how these relationships may change across a plant's range...
February 2018: Ecology and Evolution
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