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Control Of Partitioning And Export Of Carbon In Leaves Of Higher-Plants, Donald R. Geiger
Control Of Partitioning And Export Of Carbon In Leaves Of Higher-Plants, Donald R. Geiger
Biology Faculty Publications
Within source leaves, partition of assimilated carbon and export are regulated to both leaf and plant ontogeny and to environmental conditions. System goals, adaptive responses, control mechanisms, and information flow are developed from the viewpoint that a well-adapted plant is an integrated system. Regulation of partitioning and export involves both feedforward control and feedback homeostasis. Export is controlled by regulation of metabolism which supplies assimilated material to be translocated, by control of efflux into the free space of material destined for export, and by regulation of phloem loading. Control of export by the latter two processes depends on responsive metabolic …
Comparison Of Carbon And Nitrogen Content Of Infected And Uninfected Snails, Succinea Ovalis, And The Trematode Leucochloridium Variae, Albert J. Burky, Daniel J. Hornbach
Comparison Of Carbon And Nitrogen Content Of Infected And Uninfected Snails, Succinea Ovalis, And The Trematode Leucochloridium Variae, Albert J. Burky, Daniel J. Hornbach
Biology Faculty Publications
In June, 6.7% of adult Succinea ovalis collected near Urbana, Ohio, were infected with the trematode, Leucochloridium variae. The effects of parasitism were assessed as total organic carbon (equivalent to calorific values) and as total nitrogen. The parasite represents 23.8% of total (parasite + snail tissue) dry tissue weight, 21.4% of total carbon and 19.8% of total nitrogen of infected snails. The higher C:N ratio for parasite tissue indicates a higher proportion of nonproteinaceous compounds (e.g., fats and/or carbohydrates) as compared to host tissue. There is less snail tissue in parasitized S. ovalis. The C:N ratios for parasitized and nonparasitized …