caa a22 4500 465790291 CHVBK 20180323112022.0 cr unu---uuuuu 170327e19900101xx s 000 0 eng 10.1007/BF02015057 doi (NATIONALLICENCE)springer-10.1007/BF02015057 Water relations and photosynthesis in the cryptoendolithic microbial habitat of hot and cold deserts [Elektronische Daten] [Robert Palmer Jr., E. Friedmann] Two cryptoendolithic microbial communities, lichens in the Ross Desert of Antarctica and cyanobacteria in the Negev Desert, inhabit porous sandstone rocks of similar physical structure. Both rock types adsorb water vapor by physical mechanisms unrelated to biological processes. Yet the two microbial communities respond differently to water stress: cryp-toendolithic lichens begin to photosynthesize at a matric water potential of −46.4 megaPascals (MPa) [70% relative humidity (RH) at 8°C], resembling thallose desert lichens. Cryptoendolithic cyanobacteria, like other prokaryotes, photosynthesize only at very high matric water potentials [> −6.9 MPa, 90% RH at 20°C]. Springer-Verlag New York Inc., 1990 Palmer Jr. Robert Polar Desert Research Center and Department of Biological Science, Florida State University, 32306-2043, Tallahassee, Florida, USA aut Friedmann E. Polar Desert Research Center and Department of Biological Science, Florida State University, 32306-2043, Tallahassee, Florida, USA aut Microbial Ecology Springer-Verlag 19/1(1990-01-01), 111-118 0095-3628 19:1<111 1990 19 248 https://doi.org/10.1007/BF02015057 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02015057 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Palmer Jr Robert Polar Desert Research Center and Department of Biological Science, Florida State University, 32306-2043, Tallahassee, Florida, USA aut NATIONALLICENCE 700 1- Friedmann E. Polar Desert Research Center and Department of Biological Science, Florida State University, 32306-2043, Tallahassee, Florida, USA aut NATIONALLICENCE 773 0- Microbial Ecology Springer-Verlag 19/1(1990-01-01), 111-118 0095-3628 19:1<111 1990 19 248 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer