Seasonal variations in carbon fication and carbon budget partitioning in Halodule wrightii (Aschers.)
Tomasko, D.A. (1985). Seasonal variations in carbon fication and carbon budget partitioning in Halodule wrightii (Aschers.). MSc Thesis. Florida institute of technology: Florida. 35 pp.
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| Abstract |
Photosynthetic rate and partitioning of photosynthates in Halodule wrightii (Aschers.) were studied by isotope labelling methods at various temperatures. Maximum partitioning into macromolecular components (as an alcohol-aqueous insoluble fraction) correlated with temperatures at which photosynthetic rate was highest (21-30°C). At high ambient temperatures (33-36°C), the vast majority of photosynthate was in an immediately translocatable fraction, perhaps due to increased respiratory needs in non-photosynthetic plant parts. Field data indicates that Halodule wrightii experiences periods of low light intensity at these high temperatures, which would cause considerable stress to nearshore meadows. In addition, a 96 h pulse-chase experiment revealed a major fraction of activity (25%) was translocated to the roots of intact Halodule wrightii.The possibility of Halodule wrightii roots actively maintaining sediment characteristics is discussed. |
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