Influence of salinity and sediment resuspension on macrophyte germination in coastal lakes

Steinhardt, Tim; Selig, Uwe

doi:10.4081/jlimnol.2011.11

Cited by 17 publications

(6 citation statements)

References 28 publications

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“…Samples were obtained from the mouth of the Windebyer Noor (pH 6–6.5, temperature 11.7°C). The Windebyer Noor, which used to be part of the Eckernförder Bight (10°37.330′E, 54°19.330′N) at the northwest German Baltic coast, has underground connections to the open sea through culverts ( Steinhardt and Selig, 2011 ; Supplementary Figure 1 ). It represents a brackish water environment with gradual changes of salinity and temperature.…”

Section: Methodsmentioning

confidence: 99%

Molecular Networking-Based Metabolome and Bioactivity Analyses of Marine-Adapted Fungi Co-cultivated With Phytopathogens

et al. 2018

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Fungi represent a rich source of bioactive metabolites and some are marketed as alternatives to synthetic agrochemicals against plant pathogens. However, the culturability of fungal strains in artificial laboratory conditions is still limited and the standard mono-cultures do not reflect their full spectrum chemical diversity. Phytopathogenic fungi and bacteria have successfully been used in the activation of cryptic biosynthetic pathways to promote the production of new secondary metabolites in co-culture experiments. The aim of this study was to map the fungal diversity of Windebyer Noor, a brackish lake connected to Baltic Sea (Germany), to induce the chemical space of the isolated marine-adapted fungi by co-culturing with phytopathogens, and to assess their inhibitory potential against six commercially important phytopathogens. Out of 123 marine-adapted fungal isolates obtained, 21 were selected based on their phylogenetic and metabolite diversity. They were challenged with two phytopathogenic bacteria (Pseudomonas syringae and Ralstonia solanacearum) and two phytopathogenic fungi (Magnaporthe oryzae and Botrytis cinerea) on solid agar. An in-depth untargeted metabolomics approach incorporating UPLC–QToF–HRMS/MS-based molecular networking (MN), in silico MS/MS databases, and manual dereplication was employed for comparative analysis of the extracts belonging to nine most bioactive co-cultures and their respective mono-cultures. The phytopathogens triggered interspecies chemical communications with marine-adapted fungi, leading to the production of new compounds and enhanced expression of known metabolites in co-cultures. MN successfully generated a detailed map of the chemical inventory of both mono- and co-cultures. We annotated overall 18 molecular clusters (belonging to terpenes, alkaloids, peptides, and polyketides), 9 of which were exclusively produced in co-cultures. Several clusters contained compounds, which could not be annotated to any known compounds, suggesting that they are putatively new metabolites. Direct antagonistic effects of the marine-adapted fungi on the phytopathogens were observed and anti-phytopathogenic activity was demonstrated.The untargeted metabolomics approach combined with bioactivity testing allowed prioritization of two co-cultures for purification and characterization of marine fungal metabolites with crop-protective activity. To our knowledge, this is the first study employing plant pathogens to challenge marine-adapted fungi.

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Section: Methodsmentioning

confidence: 99%

Molecular Networking-Based Metabolome and Bioactivity Analyses of Marine-Adapted Fungi Co-cultivated With Phytopathogens

et al. 2018

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“…Casanova 1994). In laboratory incubation, bulbils usually germinate instantaneously and do not require pretreatments to achieve high germination rates (Steinhardt and Selig 2011;Nowak et al 2017). This raises the question of how germination of bulbils is suppressed under natural conditions, preventing germination before the death of, or release from, the parent plant (Giesenhagen 1896).…”

Section: Establishing Stands: Breaking Dormancy and Induction Of Germmentioning

confidence: 99%

Ecology of charophytes – permanent pioneers and ecosystem engineers

Schubert¹,

Blindow²,

Bueno³

et al. 2018

pip

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For almost a century, charophytes have been regarded as a group that is confined to low-nutrient-clear water conditions. In light of recent research, this generalisation of the ecological niche dimensions of charophytes has changed and now includes more facets of ecological existence. In this review, the current knowledge with respect to species-specificity as well as temporal aspectsontogenetic and successional ones of the ecological requirements of charophytes are presented and discussed. This review identifies new directions for ecological research on charophytes as well as knowledge gaps to be filled, not just for reasons of academic curiosity, but also for applied purposes such as lake restoration, bioremediation and bioindication of water quality and water regime.

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“…Other studies also confirm high densities of fructifications in densely vegetated areas, for example, about 20,000 ind. m −2 for C. contraria in the Grieben Bay and for C. aspera in the Windebyer Noor at the 0.5 m depth [44]. The mean density of full fructifications was relatively low (<10,000 ind.…”

Section: Density and Distributionmentioning

confidence: 91%

“…In general, hydrodynamics is highlighted as an important factor for the forming of macrophyte communities [8,10]. Waves also affect a distribution and spread of charophyte fructifications by a mechanical disturbance (resuspension) of fructifications [51], and by reducing water transparency (i.e., light availability) for a germination of charophytes [44].…”

Section: Hydrodynamics and Transport Of Fructificationmentioning

confidence: 99%

Distribution of Charophyte Oospores in the Curonian Lagoon and their Relationship to Environmental Forcing

Stragauskaitė

Bučas

Martin

2021

Water

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Lack of knowledge about distribution of charophyte fructifications and importance of environmental conditions in the Baltic Sea coastal waters fostered us to assess the spatial-temporal patterns of oospore bank in relationship with environmental factors in the Curonian Lagoon (Lithuanian part). We mapped the distribution of oospores in 2017–2019. The importance of environmental factors was determined by the cluster analysis and boosted regression trees. Four oospores species were recorded up to 4 m depth. The highest mean densities (58,000 ind·m−2) of viable fructifications were found along the eastern shore, where the densest charophyte stands were recorded. Viable fructifications showed a clear pattern of filling the oospore bank after the vegetation season and a depletion during the summer as they germinated. The distance from charophyte stands, salinity, bottom slope aspect, and wave exposure were the most important environmental variables. Full fructifications mostly occurred within <0.5 km distance from the charophyte stands restricted to flat and sheltered areas exposed to the northern and eastern slopes. Empty fructifications were mostly found within <2 km distance from the charophyte stands but their high density was limited to <1 km distance from the charophyte stands and on the northeastern bottom slopes and >1.5 salinity.

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Influence of salinity and sediment resuspension on macrophyte germination in coastal lakes

Abstract: The vegetation as well as diaspore banks were investigated in two coastal lakes on the German Baltic Coast.

Cited by 17 publications

References 28 publications

Molecular Networking-Based Metabolome and Bioactivity Analyses of Marine-Adapted Fungi Co-cultivated With Phytopathogens

Molecular Networking-Based Metabolome and Bioactivity Analyses of Marine-Adapted Fungi Co-cultivated With Phytopathogens

Ecology of charophytes – permanent pioneers and ecosystem engineers

Distribution of Charophyte Oospores in the Curonian Lagoon and their Relationship to Environmental Forcing

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