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https://www.readbyqxmd.com/read/28923004/regulatory-networks-underlying-mycorrhizal-development-delineated-by-genome-wide-expression-profiling-and-functional-analysis-of-the-transcription-factor-repertoire-of-the-plant-symbiotic-fungus-laccaria-bicolor
#1
Y Daguerre, E Levati, J Ruytinx, E Tisserant, E Morin, A Kohler, B Montanini, S Ottonello, A Brun, C Veneault-Fourrey, F Martin
BACKGROUND: Ectomycorrhizal (ECM) fungi develop a mutualistic symbiotic interaction with the roots of their host plants. During this process, they undergo a series of developmental transitions from the running hyphae in the rhizosphere to the coenocytic hyphae forming finger-like structures within the root apoplastic space. These transitions, which involve profound, symbiosis-associated metabolic changes, also entail a substantial transcriptome reprogramming with coordinated waves of differentially expressed genes...
September 18, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28912791/mycorrhizal-associations-and-trophic-modes-in-coexisting-orchids-an-ecological-continuum-between-auto-and-mixotrophy
#2
Hans Jacquemyn, Michael Waud, Rein Brys, Félix Lallemand, Pierre-Emmanuel Courty, Alicja Robionek, Marc-André Selosse
Two distinct nutritional syndromes have been described in temperate green orchids. Most orchids form mycorrhizas with rhizoctonia fungi and are considered autotrophic. Some orchids, however, associate with fungi that simultaneously form ectomycorrhizas with surrounding trees and derive their carbon from these fungi. This evolutionarily derived condition has been called mixotrophy or partial mycoheterotrophy and is characterized by (13)C enrichment and high N content. Although it has been suggested that the two major nutritional syndromes are clearly distinct and tightly linked to the composition of mycorrhizal communities, recent studies have challenged this assumption...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28902963/rhizospheric-fungi-and-their-link-with-the-nitrogen-fixing-frankia-harbored-in-host-plant-hippophae-rhamnoides-l
#3
Xue Zhou, Lei Tian, Jianfeng Zhang, Lina Ma, Xiujun Li, Chunjie Tian
Sea buckthorn (Hippophae rhamnoides L.) is a pioneer plant used for land reclamation and an appropriate material for studying the interactions of symbiotic microorganisms because of its nitrogen-fixing root nodules and mycorrhiza. We used high-throughput sequencing to reveal the diversities and community structures of rhizospheric fungi and their link with nitrogen-fixing Frankia harbored in sea buckthorn collected along an altitude gradient from the Qinghai Tibet Plateau to interior areas. We found that the fungal diversities and compositions varied between different sites...
September 13, 2017: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/28886028/traits-underlying-community-consequences-of-plant-intra-specific-diversity
#4
Luis Abdala-Roberts, Riley Pratt, Jessica D Pratt, Kailen A Mooney
A plant's performance and interactions with other trophic levels are recorgnized to be contingent upon plant diversity and underlying associational dynamics, but far less is known about the plant traits driving such phenomena. We manipulated diversity in plant traits using pairs of plant and a substitutive design to elucidate the mechanisms underlying diversity effects operating at a fine spatial scale. Specifically, we measured the effects of diversity in sex (sexual monocultures vs. male and female genotypes together) and growth rate (growth rate monocultures vs...
2017: PloS One
https://www.readbyqxmd.com/read/28862782/mycorrhizal-fungi-enhance-plant-nutrient-acquisition-and-modulate-nitrogen-loss-with-variable-water-regimes
#5
Timothy M Bowles, Louise E Jackson, Timothy R Cavagnaro
Climate change will alter both the amount and pattern of precipitation and soil water availability, which will directly affect plant growth and nutrient acquisition, and potentially, ecosystem functions like nutrient cycling and losses as well. Given their role in facilitating plant nutrient acquisition and water stress resistance, arbuscular mycorrhizal (AM) fungi may modulate the effects of changing water availability on plants and ecosystem functions. The well-characterized mycorrhizal tomato (Solanum lycopersicum L...
September 1, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28861250/does-responsiveness-to-arbuscular-mycorrhizal-fungi-depend-on-plant-invasive-status
#6
Kurt O Reinhart, Ylva Lekberg, John Klironomos, Hafiz Maherali
Differences in the direction and degree to which invasive alien and native plants are influenced by mycorrhizal associations could indicate a general mechanism of plant invasion, but whether or not such differences exist is unclear. Here, we tested whether mycorrhizal responsiveness varies by plant invasive status while controlling for phylogenetic relatedness among plants with two large grassland datasets. Mycorrhizal responsiveness was measured for 68 taxa from the Northern Plains, and data for 95 taxa from the Central Plains were included...
August 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28820115/six-key-traits-of-fungi-their-evolutionary-origins-and-genetic-bases
#7
László G Nagy, Renáta Tóth, Enikő Kiss, Jason Slot, Attila Gácser, Gábor M Kovács
The fungal lineage is one of the three large eukaryotic lineages that dominate terrestrial ecosystems. They share a common ancestor with animals in the eukaryotic supergroup Opisthokonta and have a deeper common ancestry with plants, yet several phenotypes, such as morphological, physiological, or nutritional traits, make them unique among all living organisms. This article provides an overview of some of the most important fungal traits, how they evolve, and what major genes and gene families contribute to their development...
July 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28818382/cell-specific-expression-of-plant-nutrient-transporter-genes-in-orchid-mycorrhizae
#8
Valeria Fochi, Nicole Falla, Mariangela Girlanda, Silvia Perotto, Raffaella Balestrini
Orchid mycorrhizal protocorms and roots are heterogeneous structures composed of different plant cell-types, where cells colonized by intracellular fungal coils (the pelotons) are close to non-colonized plant cells. Moreover, the fungal coils undergo rapid turnover inside the colonized cells, so that plant cells containing coils at different developmental stages can be observed in the same tissue section. Here, we have investigated by laser microdissection (LMD) the localization of specific plant gene transcripts in different cell-type populations collected from mycorrhizal protocorms and roots of the Mediterranean orchid Serapias vomeracea colonized by Tulasnella calospora...
October 2017: Plant Science: An International Journal of Experimental Plant Biology
https://www.readbyqxmd.com/read/28803341/gypsy-moth-herbivory-induced-volatiles-and-reduced-parasite-attachment-to-cranberry-hosts
#9
Muvari C Tjiurutue, Hilary A Sandler, Monica F Kersch-Becker, Nina Theis, Lynn S Adler
Interactions between species can have cascading effects that shape subsequent interactions. For example, herbivory can induce plant defenses that affect subsequent interactions with herbivores, pathogens, mycorrhizae, and pollinators. Parasitic plants are present in most ecosystems, and play important roles in structuring communities. However, the effects of host herbivory on parasitic plants, and the potential mechanisms underlying such effects, are not well known. We conducted a greenhouse study to ask whether gypsy moth (Lymantria dispar) damage, host cultivar, and their interaction affected preference of the stem parasite dodder (Cuscuta spp...
August 12, 2017: Oecologia
https://www.readbyqxmd.com/read/28799726/external-hyphae-of-rhizophagus-irregularis-daom-197198-are-less-sensitive-to-low-ph-than-roots-in-arbuscular-mycorrhizae-evidence-from-axenic-culture-system
#10
Ning Wang, Zengwei Feng, Yang Zhou, Honghui Zhu, Qing Yao
The growth of plant roots and arbuscular mycorrhizal fungi (AMF) can be inhibited by low pH; however, it is largely unknown which is more sensitive to low pH. This study aimed to compare the physiological and molecular responses of external hyphae (EH) and roots to low pH in terms of growth, development and functioning. We established AM symbiosis in a two-compartmented system (root compartment, RC; hyphal compartment, HC) using AMF and transformed hairy roots and exposed them to pH 6.5 and/or pH 4.5. The results showed that pH 4...
August 11, 2017: Environmental Microbiology Reports
https://www.readbyqxmd.com/read/28789611/role-of-the-gras-transcription-factor-ata-ram1-in-the-transcriptional-reprogramming-of-arbuscular-mycorrhiza-in-petunia-hybrida
#11
Mélanie K Rich, Pierre-Emmanuel Courty, Christophe Roux, Didier Reinhardt
BACKGROUND: Development of arbuscular mycorrhiza (AM) requires a fundamental reprogramming of root cells for symbiosis. This involves the induction of hundreds of genes in the host. A recently identified GRAS-type transcription factor in Petunia hybrida, ATA/RAM1, is required for the induction of host genes during AM, and for morphogenesis of the fungal endosymbiont. To better understand the role of RAM1 in symbiosis, we set out to identify all genes that depend on activation by RAM1 in mycorrhizal roots...
August 8, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28771548/differentially-expressed-genes-in-mycorrhized-and-nodulated-roots-of-common-bean-are-associated-with-defense-cell-wall-architecture-n-metabolism-and-p-metabolism
#12
Kalpana Nanjareddy, Manoj-Kumar Arthikala, Brenda-Mariana Gómez, Lourdes Blanco, Miguel Lara
Legumes participate in two important endosymbiotic associations, with phosphorus-acquiring arbuscular mycorrhiza (AM, soil fungi) and with nitrogen-fixing bacterial rhizobia. These divergent symbionts share a common symbiotic signal transduction pathway that facilitates the establishment of mycorrhization and nodulation in legumes. However, the unique and shared downstream genes essential for AM and nodule development have not been identified in crop legumes. Here, we used ion torrent next-generation sequencing to perform comparative transcriptomics of common bean (Phaseolus vulgaris) roots colonized by AM or rhizobia...
2017: PloS One
https://www.readbyqxmd.com/read/28769964/application-of-mycorrhiza-and-soil-from-a-permaculture-system-improved-phosphorus-acquisition-in-naranjilla
#13
Sarah Symanczik, Michelle Gisler, Cécile Thonar, Klaus Schlaeppi, Marcel Van der Heijden, Ansgar Kahmen, Thomas Boller, Paul Mäder
Naranjilla (Solanum quitoense) is a perennial shrub plant mainly cultivated in Ecuador, Colombia, and Central America where it represents an important cash crop. Current cultivation practices not only cause deforestation and large-scale soil degradation but also make plants highly susceptible to pests and diseases. The use of arbuscular mycorrhizal fungi (AMF) can offer a possibility to overcome these problems. AMF can act beneficially in various ways, for example by improving plant nutrition and growth, water relations, soil structure and stability and protection against biotic and abiotic stresses...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28726631/lipid-transfer-from-plants-to-arbuscular-mycorrhiza-fungi
#14
Andreas Keymer, Priya Pimprikar, Vera Wewer, Claudia Huber, Mathias Brands, Simone L Bucerius, Pierre-Marc Delaux, Verena Klingl, Edda von Röpenack-Lahaye, Trevor L Wang, Wolfgang Eisenreich, Peter Dörmann, Martin Parniske, Caroline Gutjahr
Arbuscular mycorrhiza (AM) symbioses contribute to global carbon cycles as plant hosts divert up to 20% of photosynthate to the obligate biotrophic fungi. Previous studies suggested carbohydrates as the only form of carbon transferred to the fungi. However, de novo fatty acid (FA) synthesis has not been observed in AM fungi in absence of the plant. In a forward genetic approach, we identified two Lotus japonicus mutants defective in AM-specific paralogs of lipid biosynthesis genes (KASI and GPAT6). These mutants perturb fungal development and accumulation of emblematic fungal 16:1ω5 FAs...
July 20, 2017: ELife
https://www.readbyqxmd.com/read/28725961/the-plasma-membrane-proteome-of-medicago-truncatula-roots-as-modified-by-arbuscular-mycorrhizal-symbiosis
#15
Achref Aloui, Ghislaine Recorbet, Christelle Lemaître-Guillier, Arnaud Mounier, Thierry Balliau, Michel Zivy, Daniel Wipf, Eliane Dumas-Gaudot
In arbuscular mycorrhizal (AM) roots, the plasma membrane (PM) of the host plant is involved in all developmental stages of the symbiotic interaction, from initial recognition to intracellular accommodation of intra-radical hyphae and arbuscules. Although the role of the PM as the agent for cellular morphogenesis and nutrient exchange is especially accentuated in endosymbiosis, very little is known regarding the PM protein composition of mycorrhizal roots. To obtain a global overview at the proteome level of the host PM proteins as modified by symbiosis, we performed a comparative protein profiling of PM fractions from Medicago truncatula roots either inoculated or not with the AM fungus Rhizophagus irregularis...
July 19, 2017: Mycorrhiza
https://www.readbyqxmd.com/read/28725395/reduced-aboveground-tree-growth-associated-with-higher-arbuscular-mycorrhizal-fungal-diversity-in-tropical-forest-restoration
#16
Ellen K Holste, Karen D Holl, Rakan A Zahawi, Richard K Kobe
Establishing diverse mycorrhizal fungal communities is considered important for forest recovery, yet mycorrhizae may have complex effects on tree growth depending on the composition of fungal species present. In an effort to understand the role of mycorrhizal fungi community in forest restoration in southern Costa Rica, we sampled the arbuscular mycorrhizal fungal (AMF) community across eight sites that were planted with the same species (Inga edulis, Erythrina poeppigiana, Terminalia amazonia, and Vochysia guatemalensis) but varied twofold to fourfold in overall tree growth rates...
October 2016: Ecology and Evolution
https://www.readbyqxmd.com/read/28698354/enhanced-secondary-and-hormone-metabolism-in-leaves-of-arbuscular-mycorrhizal-medicago-truncatula
#17
Lisa Adolfsson, Hugues Nziengui, Ilka N Abreu, Jan Šimura, Azeez Beebo, Andrei Herdean, Jila Aboalizadeh, Jitka Široká, Thomas Moritz, Ondřej Novák, Karin Ljung, Benoît Schoefs, Cornelia Spetea
Arbuscular mycorrhizas (AM) are the most common symbiotic associations between a plant's root compartment and fungi. They provide nutritional benefit (mostly inorganic phosphate [Pi]), leading to improved growth, and nonnutritional benefits, including defense responses to environmental cues throughout the host plant, which, in return, delivers carbohydrates to the symbiont. However, how transcriptional and metabolic changes occurring in leaves of AM plants differ from those induced by Pi fertilization is poorly understood...
September 2017: Plant Physiology
https://www.readbyqxmd.com/read/28695334/arbuscular-mycorrhizas-are-present-on-spitsbergen
#18
K K Newsham, P B Eidesen, M L Davey, J Axelsen, E Courtecuisse, C Flintrop, A G Johansson, M Kiepert, S E Larsen, K E Lorberau, M Maurset, J McQuilkin, M Misiak, A Pop, S Thompson, D J Read
A previous study of 76 plant species on Spitsbergen in the High Arctic concluded that structures resembling arbuscular mycorrhizas were absent from roots. Here, we report a survey examining the roots of 13 grass and forb species collected from 12 sites on the island for arbuscular mycorrhizal (AM) colonisation. Of the 102 individuals collected, we recorded AM endophytes in the roots of 41 plants of 11 species (Alopecurus ovatus, Deschampsia alpina, Festuca rubra ssp. richardsonii, putative viviparous hybrids of Poa arctica and Poa pratensis, Poa arctica ssp...
July 10, 2017: Mycorrhiza
https://www.readbyqxmd.com/read/28681951/natural-succession-on-abandoned-cropland-effectively-decreases-the-soil-erodibility-and-improves-the-fungal-diversity
#19
Chao Zhang, Guobin Liu, Zilin Song, Dong Qu, Linchuan Fang, Lei Deng
Changes in plants and soils during natural succession have been evaluated, but little is known about the effects of succession on the activities of soil microbes and their interactions with soil erodibility. We conducted a field study on the Chinese Loess Plateau, typical of this semiarid area, to determine the effect of secondary succession on the stability of soil structure against erosion and on the composition of soil fungal communities. Characteristics of plant, soil, and fungal communities were assessed across a 30-yr chronosequence of grassland developed from abandoned cropland...
July 6, 2017: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/28680077/facilitation-of-phosphorus-uptake-in-maize-plants-by-mycorrhizosphere-bacteria
#20
Fabio Battini, Mette Grønlund, Monica Agnolucci, Manuela Giovannetti, Iver Jakobsen
A major challenge for agriculture is to provide sufficient plant nutrients such as phosphorus (P) to meet the global food demand. The sufficiency of P is a concern because of it's essential role in plant growth, the finite availability of P-rock for fertilizer production and the poor plant availability of soil P. This study investigated whether biofertilizers and bioenhancers, such as arbuscular mycorrhizal fungi (AMF) and their associated bacteria could enhance growth and P uptake in maize. Plants were grown with or without mycorrhizas in compartmented pots with radioactive P tracers and were inoculated with each of 10 selected bacteria isolated from AMF spores...
July 5, 2017: Scientific Reports
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