Current Search: Plant morphology (x)
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Title
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The seagrass, Zostera Marina L.: plant morphology and bed structure in relation to sediment ammonium in Izembek Lagoon, Alaska.
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Creator
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Short, F. T., Harbor Branch Oceanographic Institute
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Date Issued
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1983
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PURL
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http://purl.flvc.org/FCLA/DT/3331843
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Subject Headings
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Zostera marina, Eelgrass, Izembek Lagoon (Alaska), Ammonium, Plant morphology
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Format
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Document (PDF)
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Title
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Sulfur-35 incorporation in the seagrass Thalassia testudinum under oxic and anoxic conditions.
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Creator
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Peters, Jasmine Star., Florida Atlantic University, Koch, Marguerite
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Abstract/Description
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Currently, there is a great deal of interest in the role of sulfur in the seagrass ecosystems and for sulfide, a known phytotoxin, in particular. This research used a 35S tracer technique to examine sulfur metabolism in the seagrass Thalassia testudinum. The uptake of the 35S radiotracer was documented at similar rates under both oxic and anoxic treatments. The highest total radioactivity was in root and rhizome tissue, as compared to the leaves. 35S translocation from roots to leaves was...
Show moreCurrently, there is a great deal of interest in the role of sulfur in the seagrass ecosystems and for sulfide, a known phytotoxin, in particular. This research used a 35S tracer technique to examine sulfur metabolism in the seagrass Thalassia testudinum. The uptake of the 35S radiotracer was documented at similar rates under both oxic and anoxic treatments. The highest total radioactivity was in root and rhizome tissue, as compared to the leaves. 35S translocation from roots to leaves was found to be more efficient in young versus mature leaves. Total sulfur uptake was estimated and found to be significantly different between root and rhizome tissue under oxic conditions. In the anoxic treatment, 1 mM sulfide may have been a threshold, at which the seagrass showed reduced uptake of 35S into the below-ground tissue. While the plants assisted in the production of sulfide in this experiment, sulfide accumulation may inhibit 35S uptake. This is counter to the idea of increased sulfide intrusion under sediment hypoxia. This study represents the first attempt to use 35S to trace sulfur incorporation into seagrass; further research will be required to understand the complex sulfur biochemistry of these important marine plants using this method.
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Date Issued
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2006
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PURL
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http://purl.flvc.org/fcla/dt/13385
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Subject Headings
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Seagrasses--Ecology, Sulfates--Physiological effect, Plant morphology, Marine sediments
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Format
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Document (PDF)
