Publications by authors named "Junde Dong"

Seagrass meadows are under threat due to climate change and human activities, including heavy metal contamination, which can accumulate in seagrass tissues and harm their health and productivity. Despite extensive research, effective remediation strategies are lacking. This study investigated biochar's potential as a remediation agent for seagrass meadows affected by heavy metal pollution.

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Reactive oxygen species (ROS) are critical for maintaining cellular homeostasis and function. The main source of intracellular ROS depends on the NADPH oxidase (Nox) and plays crucial roles in immune deafens in animal. However, the function of Nox in crustaceans remains unclear.

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Spotted knifejaw (Oplegnathus punctatus) is an economically important marine cultured species exhibiting a unique complex sex chromosome system (XXXX in females and XXY in males), with males possessing one fewer chromosome (2n = 47) than females (2n = 48) and an abnormally large Y chromosome. Additionally, males demonstrate significant growth advantages over females. Rapid and accurate sex identification is essential for effective culture management, selective breeding, and population control.

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Microorganisms in the sediment play a pivotal role in the functioning and stability of seagrass ecosystems and their dynamics are influenced by the nutrient acquisition strategies of host plants. While the distinct impacts of microbial generalists and specialists on community dynamics are recognized, their distribution patterns and ecological roles within seagrass ecosystems remain largely unexplored. To address this issue, we conducted an analysis of community assembly processes and co-occurrence relationships of both microbial generalists and specialists within sediment profiles (0-100 cm) from seagrass habitats subjected to differing land use conditions.

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Background: Coral reefs experience frequent and severe disturbances that can overwhelm their natural resilience. In such cases, ecological restoration is essential for coral reef recovery. Sexual reproduction has been reported to present the simplest and most cost-effective means for coral reef restoration.

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In the background of global warming, coral bleaching induced by elevated seawater temperature is the primary cause of coral reef degradation. Coral microbiome engineering using the beneficial microorganisms for corals (BMCs) has become a hot spot in the field of coral reef conservation and restoration. Investigating the potential of alleviating thermal stress by quorum quenching (QQ) bacteria may provide more tools for coral microbial engineering remediation.

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Article Synopsis
  • Scleractinian corals are crucial for building tropical coral reefs, and nitrogen cycling by microbes is essential for these ecosystems.
  • This study focused on the stony coral Pocillopora damicornis, using experiments to measure nitrogen production through two processes: denitrification and anammox.
  • Results showed that denitrification was the primary nitrogen removal process, accounting for about 90% of nitrogen production and exhibiting daily patterns tied to coral photosynthesis, enhancing our knowledge of nitrogen cycling's role in coral resilience.
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Plant growth-promoting rhizobacteria (PGPR) inoculation is a crucial strategy for maintaining the sustainability of agriculture and presents a promising solution for seagrass ecological restoration in the face of disturbances. However, the possible roles and functions of PGPRs in the seagrass rhizosphere remain unclear. Here, we isolated rhizosphere bacterial strains from both reef and coastal regions and screened two PGPR isolates regarding their in vivo functional traits.

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Circular RNA (circRNA), one of the important non-coding RNA molecules with a closed-loop structure, plays a key regulatory role in cell processing. In this study, circRNAs of Epinephelus coioides, an important marine cultured fish in China, were isolated and characterized, and the network of circRNAs and mRNA was explored during Singapore grouper iridovirus (SGIV) infection, one of the most important double stranded DNA virus pathogens of marine fish. 10 g of raw data was obtained by high-throughput sequencing, and 2599 circRNAs were classified.

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Seagrass meadows play vital ecological roles in the marine ecosystem. Global climate change poses considerable threats to seagrass survival. However, it is unclear how seagrass and its associated bacteria will respond under future complex climate change scenarios.

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Mangrove ecosystems play curial roles in providing many ecological services and alleviating global climate change. However, they are in decline globally, mainly threatened by human activities and global warming, and organic pollutants, especially PAHs, are among the crucial reasons. Microbial remediation is a cost-effective and environmentally friendly way of alleviating PAH contamination.

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Protein kinase C (PKC) constitutes the main signal transduction pathway, and participates in the signal pathway of cell proliferation and movement in mammals. In this study, PKC-ɑ was obtained from Epinephelus coioides, an important marine fish cultivated in the coastal areas of southern China and Southeast Asia. The full length cDNA of PKC-ɑ was 3362 bp in length containing a 23 bp 5'UTR, a 1719 bp 3'UTR, and a 1620 bp open reading frame encoding 539 amino acids.

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is an obligate marine microorganism and the dominant autotroph in tropical and subtropical open ocean. However, the salinity range for growing and response to low salinity exposure of are still unknown. In this study, we found that low-light adapted stain NATL1A and high-light adapted strain MED4 could be acclimated in the lowest salinity of 25 and 28 psu, respectively.

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Article Synopsis
  • Seagrass meadows, important blue carbon ecosystems, are declining yearly, prompting research into methods like biochar to improve soil quality and combat climate change in these habitats.
  • This study explored the effects of maize-derived biochar on the bacterial communities in the sediment and rhizosphere of seagrass over a month, finding significant changes in bacterial composition and nutrient levels.
  • Results indicated that biochar enhanced nutrient cycling and may promote seagrass growth by altering bacterial communities, suggesting potential benefits for using biochar in marine ecosystems.
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Seagrass meadows constitute a prestigious ecosystem in the marine environment, providing valuable ecological and commercial services. Among the various causes, pollutions are considered one of the significant reasons for seagrass decline globally. This study investigates the impacts of polycyclic aromatic hydrocarbons mixture (pyrene, phenanthrene, and fluorene) on bacterial communities in Halophila ovalis sediments.

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The settlement and metamorphosis of coral larvae are the bottleneck of coral recruitment. They are critical for the extension of coral population, which is the basis of the restoration of degraded coral reef ecosystem. In this study, we described the genomic characteristics of Metabacillus sp.

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Three undescribed cyclic lipopeptides maribasins C-E and four undescribed linear peptides aspergillipeptides H-K together with three known analogous maribasins A-B and marihysin A were isolated from the marine gorgonian-associated fungus Aspergillus sp. SCSIO 41501 (Trichocomaceae). Their structures were determined by spectroscopic analysis, and their absolute configurations were further confirmed by Marfey's methods.

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Seagrasses are an important part of the coral reef ecosystem, and their rhizosphere microbes are of great ecological importance. However, variations in diversity, composition, and potential functions of bacterial communities in the seagrass rhizosphere of coral reef ecosystems remain unclear. This study employed the high-throughput sequencing based on 16S rDNA gene sequences and functional annotation of prokaryotic taxa (FAPROTAX) analysis to investigate these variations based on seagrass species and sampling locations, respectively.

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Seagrass ecosystems are among the most productive marine ecosystems, and diazotrophic communities play a crucial role in sustaining the productivity and stability of such ecosystems by introducing fixed nitrogen. However, information concerning both total and active diazotrophic groups existing in different compartments of seagrass is lacking. This study comprehensively investigated the diversity, structure, and abundance of diazotrophic communities in different parts of the seagrass Halophila ovalis at the DNA and RNA level from clone libraries and real-time quantitative PCR.

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Article Synopsis
  • Seagrass meadows are crucial marine ecosystems threatened by hydrocarbon contaminants like alkanes.
  • A study explored the bacterial communities that degrade alkanes in the sediments around two seagrass species, showing differing bacterial diversity between their rhizosphere and non-rhizosphere areas.
  • The findings suggest that coastal areas have a richer alkane-degrading bacterial community, with the predominant bacteria belonging to the genus Agrobacterium, contributing to our understanding of these ecosystems in the South China Sea.
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Seagrass meadows have seriously deteriorated in recent years. Seagrass associated phytate-mineralizing rhizobacteria potentially have functions related to seagrass nutrition, health and sustainable growth. The β-propeller phytases (BPPs) are the only phytase family in aquatic environments, but there are few studies on the BPP community structure of seagrass.

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Polycyclic aromatic hydrocarbons (PAHs), originating from anthropogenic and natural sources, are highly concerned environmental pollutants. This study investigated the impact of two model PAHs (pyrene and phenanthrene) on bacterial community succession in the seagrass meadows sediment in a lab-scale microcosm. Halophila ovalis sediment slurry microcosms were established, one group was placed as a control, and the other two were treated with pyrene and phenanthrene.

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Coral reef ecosystems usually distribute in oligotrophic tropical and subtropical marine environments, but they possess great biodiversity and high productivity. It may attribute to its efficient internal nutrient cycle system. However, the knowledge of functional microbial community structure is still limited.

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Background: The coral microbiome plays a key role in host health by being involved in energy metabolism, nutrient cycling, and immune system formation. Inoculating coral with beneficial bacterial consortia may enhance the ability of this host to cope with complex and changing marine environments. In this study, the coral Pocillopora damicornis was inoculated with a beneficial microorganisms for corals (BMC) consortium to investigate how the coral host and its associated microbial community would respond.

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