Symbiotic UCYN-A strains co-occurred with El Niño, relaxed upwelling, and varied eukaryotes over 10 years off Southern California
5
Citation
68
Reference
10
Related Paper
Citation Trend
Abstract:
Biological nitrogen fixation, the conversion of NThis chapter contains sections titled: Introduction Rhizosphere and Bacterial Diversity Diazotrophic Bacteria Symbiotic Diazotrophic Bacteria Asymbiotic Diazotrophic Bacteria Asymbiotic Nitrogen Fixation and Its Significance to Plant Growth Plant Growth Promoting Mechanisms of Diazotrophic PGPR Interaction of Diazotrophic PGPR with Other Microorganisms Interaction of Diazotrophic PGPR with Rhizobia Interaction of Diazotrophic PGPR with Arbuscular Mycorrhizae Other Dimensions of Plant Growth Promoting Activities ACC Deaminase Activity Induced Systemic Resistance (ISR) Improved Stress Tolerance Quorum Sensing Critical Gaps in PGPR Research and Future Directions References
Cite
Citations (16)
Cite
Citations (8)
Abstract Changes in coastal upwelling strength have been widely studied since 1990 when Bakunproposed that global warming can induce the intensification of upwelling in coastalareas. Whether present wind trends support this hypothesis remains controversial, asresults of previous studies seem to depend on the study area, the length of the timeseries, the season and even the database used. In this study, temporal and spatialtrends in the coastal upwelling regime worldwide were investigated during upwellingseasons from 1982 to 2010 using a single wind database (Climate Forecast SystemReanalysis) with high spatial resolution (0.3°). Of the major upwellingsystems, increasing trends were only observed in the coastal areas of Benguela,Peru, Canary and northern California. A tendency for an increase inupwelling-favourable winds was also identified along several less studied regions,such as the western Australian and southern Caribbean coasts.
Cite
Citations (153)
Biogeochemistry
Cite
Citations (48)
Tanjong Karang is a rice growing area in Malaysia. Soil belongs to inceptisol order, pH around 4.5-5.0 and harbors a diverse group of nitrogen fixing bacteria. Beside nitrogen-fixing activity these diazotrophs produced phytohormones especially, indoleacetic acid which enhanced extensive root architecture and help plant to acquire more nutrients from the surrounding area. Higher population of diazotrophs found in the rhizosphere as plant root exudates provides required carbon sources for nitrogen fixation and growth of the bacteria. Diazotrophs have preferences of carbon source utilization. Plant-diazotroph association largely depends on root exudates. Application of preferred carbon sources increased diazotroph population and nitrogen fixation. Availability of preferable carbon sources increased biological nitrogen fixation and fulfilled about 40 percent of total plant nitrogen requirements. Plant inoculated with these diazotrophs increased total biomass and photosynthesis.These diazotrophs have potential to be used as biofertilizer.
Biofertilizer
Cite
Citations (0)
把地质的调查， stratigraphic 节测量和室内的全面调查基于地， Zanda 盆在 Himalaya 板中的构造地点被查明，并且 Zanda 盆的形成和进化作为六个阶段在到早更新世的上新世期间被分类：(a) 主要指责裂缝的舞台，(b) 快指责裂缝的舞台，(c) 集中的指责裂缝的舞台，(d) 壅滞舞台，(e) 第二等的指责裂缝的舞台，和(f) 第二等的快指责裂缝的舞台。基于 Zanda 盆的这个六阶段的形成进化理论，当下列五上演，到早更新世的从上新世的西方的 Himalaya 山的 upwelling 过程被分类：(a) 慢 upwelling 舞台(5.44.4 妈) ，(b) 中间速度的 upwelling 舞台(4.43.5 妈) ，(c) 快 upwelling 舞台(3.53.2 妈) ，(d)停止 upwelling 阶段(3.22.7 妈) ，和(e) 快 upwelling 舞台(2.7 妈) 。研究从早上新世(4.7 妈) 在持续时间显示出那到上新世(2.67 妈) 的目的，它持续了 203 万年， Himalaya 山高举了在 0.74 mm/a 的速度的 1500 m；这属于中间速度的 upwelling。在在早更新世的早阶段的 131 万年期间， Himalaya 山在 1.15 mm/a 的速度在另一 1500 m 上面升起了；这是相当快的 upwelling。所有这些数据证明了西方的 Himalaya 山的 upwelling 沿着有 multi-stages，多速度，和非天律不变论的特征的一个复杂过程。
Cite
Citations (2)
Diazotrophic microorganisms are taxonomically and metabolically diverse and they populate a wide variety of habitats. Diazotroph diversity is typically quantified through the analysis of nitrogenase nifH gene sequences recovered from environmental samples. In this chapter we review the global census of diazotrophic microorganisms as assessed by the diversity of nifH gene sequences in public sequence databases. We assess the diversity of diazotrophs found in different environments and taxonomic groupings and we also evaluate PCR primers and probes used to assess diazotroph diversity. Furthermore, we assess the range of habitats and geographic regions in which diazotrophic diversity has been assessed. We find that diazotrophs in many habitats remain under sampled. We also find that nifH cluster III, which includes obligate anaerobes, contains the greatest diversity of nifH sequences and that anoxic environments both contain the greatest diversity of diazotrophs and are the environments in which diazotrophic diversity is most poorly sampled. Our knowledge of diazotroph diversity is likely to expand dramatically as next-generation sequencing technologies are targeted towards surveys of the nifH gene.
Cite
Citations (7)
Research on upwelling in the Taiwan Strait, based on hydrographic observations and numerical modeling, has indicated that there are four upwelling regions in the Strait: along the southwestern coast of the Taiwan Strait (SW-upwelling region), along the northwestern coast of the Taiwan Strait (NW-upwelling region), near the Taiwan Bank (TB-upwelling region), and around the Penghu Islands (PH-upwelling region). These upwellings are principally induced by the southwesterly monsoon and the ascending movement of the northward, near-bottom current along the uplifting bottom topography. The SW-upwelling and NW-upwelling occur during the southwesterly monsoon period in summer, and the TB-upwelling and PH-upwelling occur year- round with varying strength and scale.
Cite
Citations (64)
Qiongdong upwelling is seasonal coastal upwelling east of Hainan Island.It usually occurs during April-September with the strongest upwelling in June and July in the area of 18o30’ 20oN and west of 111o30’E,where the summer surface water has low temperature,high salinity,low dissolved oxygen and rich nutrients.In this study,the temporal-spatial characteristics and mechanisms of Qiongdong upwelling are reviewed based on the studies since the 1960s.These studies mainly described basic hydrography,interannual variability,and influences of wind and topography on Qiongdong upwelling.Comparing to the latest studies in coastal upwelling,much work needs to be done on Qiongdong upwelling via comprehensive dynamic and ecologic investigations,on issues such as the interannual variability and its mechanisms,and the interaction between Qiongdong upwelling and large-scale circulation.
Cite
Citations (25)