caa a22 4500 46909673X CHVBK 20180323133033.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1007/BF00317417 doi (NATIONALLICENCE)springer-10.1007/BF00317417 Photosynthetic response to sunflecks in the desiccation-tolerant fern Polypodium virginianum [Elektronische Daten] [B. Gildner, D. Larson] Summary: The photosynthetic response to sunflecks was investigated in the fern Polypodium virginianum growing on cliff edges of the Niagara Escarpment, in southern Ontario, Canada. Ferns were exposed to natural precipitation, continuous watering, or continuous drought prior to exposure to artificial sunflecks. The results were analyzed using temperature, humidity and previous exposure to light as covariates. The response to sunflecks was extremely rapid and showed no measurable induction period in the field. Controlled experiments completed in the laboratory showed exceptionally short induction periods. Previous exposure to sunflecks, and desiccation did not influence the time constants of response to sunflecks although drying did reduce maximum rates of CO2 exchange. Polypodium virginianum shows an extremely rapid response to fluctuations in the supply of light, and this is interpreted to be advantageous to this species because of the array of extremely hostile conditions that occur at cliff edges. Springer-Verlag, 1992 Polypodium virginianum nationallicence Sunflecks nationallicence In situ photosynthesis nationallicence Desiccation tolerance nationallicence Gildner B. Department of Botany, University of Guelph, N1G 2W1, Guelph, Ontario, Canada aut Larson D. Department of Botany, University of Guelph, N1G 2W1, Guelph, Ontario, Canada aut Oecologia Springer-Verlag 89/3(1992-03-01), 390-396 0029-8549 89:3<390 1992 89 442 https://doi.org/10.1007/BF00317417 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317417 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gildner B. Department of Botany, University of Guelph, N1G 2W1, Guelph, Ontario, Canada aut NATIONALLICENCE 700 1- Larson D. Department of Botany, University of Guelph, N1G 2W1, Guelph, Ontario, Canada aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 89/3(1992-03-01), 390-396 0029-8549 89:3<390 1992 89 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer