Production and role of hyaline hairs in Ceramium rubrum |
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Authors: | J A DeBoer F G Whoriskey |
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Institution: | (1) Woods Hole Oceanographic Institution, 02543 Woods Hole, Massachusetts, USA;(2) Present address: The Biomedical Laboratories, 13511 Babcock Road, 78249 San Antonio, Texas, USA;(3) Present address: Department de Biologie, Université Laval, Cité Universitaire, G1K 7P4 Ste Foy, Québec, Canada |
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Abstract: | Light intensity within the range of 40 to 210 E · m-2 · s-1 had relatively little effect on the abundance, length or distribution of Ceramium rubrum unicellular, hyaline hairs. External NH
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concentrations less than 0.5 M stimulated hair initiation and growth in apical regions of the thalli. Ammonium concentrations in excess of 20 M inhibited hair formation on all regions of the thalli. Ammonium uptake velocities of plants with hairs were approximately twice those of plants without hairs. These hairs may be adaptive to take advantage of intermittent bursts of nutrients by increasing the plant's surface area and, hence, the number of nutrient uptake sites.Woods Hole Oceanographic Institution Contribution No. 5526 |
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