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Evolution, Diversity, and Habitats of Poikilohydrous Vascular Plants

  • Stefan PorembskiEmail author
Chapter
Part of the Ecological Studies book series (ECOLSTUD, volume 215)

Abstract

Water stress is a common environmental constraint in terrestrial ecosystems. Among the various strategies to cope with temporal lack of water, poikilohydry is an important adaptive trait under specific habitat conditions. Desiccation tolerant vascular plants are particularly common among ferns, fern allies, and angiosperms that colonize forest canopies and mainly tropical rock outcrops (e.g., granitic/gneissic inselbergs, ferricretes) where environmental conditions (e.g., high temperatures, lack of water, and soil) are harsh.

Within vascular plants poikilohydry has evolved more than a dozen times independently. Within angiosperms desiccation tolerance is absent in the basalmost angiosperm clades and has evolved in rather advanced lineages. Most species rich are ferns and fern allies (e.g., Hymenophyllaceae, Polypodiaceae, Selaginellaceae) with angiosperms (monocotyledons: Boryaceae, Cyperaceae, Poaceae, Velloziaceae; dicotyledons: e.g., Gesneriaceae, Linderniaceae, Myrothamnaceae) playing only a minor role. It can be speculated that a number of Bromeliaceae could be poikilohydrous too. The total number of desiccation tolerant vascular plant species could reach c. 1,300 (c. 1,000 ferns/fern allies, c. 300 angiosperms).

In particular, on tropical rock outcrops, desiccation-tolerant vascular plants may become dominant. Particularly characteristic are mat-forming monocotyledons that cover steep rocky slopes whereas other desiccation tolerant vascular plants occur in crevices, shallow depressions, and temporally water-filled rock pools. Prominent mat-formers on inselbergs in South America, Africa, and Madagascar are treelet-like Cyperaceae and Velloziaceae that can attain an age of several hundred years. Their stems mainly consist of adventitious roots that possess a velamen radicum that might contribute to the rapid uptake of water.

Desiccation tolerant vascular plants are most richly represented in constantly wet to seasonally dry (length of the dry season 3–8 months) tropical regions with their species numbers decreasing under desert-like climatic conditions. Centres of diversity for resurrection plants are certain tropical regions with East Africa, Madagascar, and southeastern Brazil being most speciose. In the temperate zone parts of Australia and North America are likewise rich in poikilohydric species.

Increasing human pressure (e.g., fire, quarrying) on the natural habitats of poikilohydric vascular plants is a serious threat to their long-term survival and measures for their ex situ conservation should be taken into account.

Keywords

Vascular Plant Desiccation Tolerance Rock Outcrop Resurrection Plant Rocky Slope 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

Financial support is gratefully acknowledged for rock outcrop studies by the Deutsche Forschungsgemeinschaft. The author is deeply indebted for valuable discussions and remarks to W. Barthlott (Bonn), J.-P. Ghogue (Yaoundé), S. D. Hopper (Kew), N. Korte (Rostock), Z. Tuba (Gödöllö) and G. Zotz (Oldenburg).

References

  1. Alves RJV (1994) Morphological age determination and longevity in some Vellozia populations in Brazil. Folia Geobot Phytotaxon 29:55–59CrossRefGoogle Scholar
  2. Bewley JD (1995) Physiological aspects of desiccation tolerance – a retrospect. Int J Plant Sci 156:393–403CrossRefGoogle Scholar
  3. Dinter K (1918) Botanische Reisen in Deutsch-Südwest-Afrika. Feddes Rep Beih 3:1–169Google Scholar
  4. Fahn A, Cutler DF (1992) Xerophytes. In: Braun HJ, Carlquist S, Ozenda P, Roth I (eds) Handbuch der Pflanzenanatomie, vol 13, part 3, Spezieller Teil. Borntraeger, BerlinGoogle Scholar
  5. Gaff DF (1977) Desiccation tolerant vascular plants of Southern Africa. Oecologia 31:95–109CrossRefGoogle Scholar
  6. Gaff DF (1981) The biology of resurrection plants. In: Pate JS, McComb AJ (eds) The biology of Australian plants. University of Western Australia Press, Perth, pp 114–146Google Scholar
  7. Gaff DF (1989) Responses of desiccation tolerant “resurrection” plants to water stress. In: Kreeb KH, Richter H, Hinckley TM (eds) Structural and functional responses to environmental stresses: water shortages. SPB Academic Publishing, The Hague, pp 264–311Google Scholar
  8. Gaff DF, Latz PK (1978) The occurrence of resurrection plants in the Australian flora. Aust J Bot 26:485–492CrossRefGoogle Scholar
  9. Hambler DJ (1961) A poikilohydrous, poikilochlorophyllous angiosperm from Africa. Nature 191:1415–1416CrossRefGoogle Scholar
  10. Hartung W, Schiller P, Dietz K-J (1998) The physiology of poikilohydric plants. Prog Bot 59:299–327Google Scholar
  11. Heil H (1924) Chamaegigas intrepidus Dtr., eine neue Auferstehungspflanze. Beitr Bot Zentralbl 41:41–50Google Scholar
  12. Heilmeier H, Durka W, Woitke M, Hartung W (2005) Ephemeral pools as stressful and isolated habitats for the endemic aquatic resurrection plant Chamaegigas intrepidus. Phytocoenologia 35:449–468CrossRefGoogle Scholar
  13. Hietz P, Briones O (1998) Correlation between water relations and within-canopy distribution of epiphytic ferns in a Mexican cloud forest. Oecologia 114:305–316CrossRefGoogle Scholar
  14. Ingram J, Bartels D (1996) The molecular basis of dehydration tolerance in plants. Annu Rev Plant Physiol Plant Mol Biol 47:377–403PubMedCrossRefGoogle Scholar
  15. Iturriaga G, Gaff DF, Zentella R (2000) New desiccation-tolerant plants, including a grass, in the central highlands of Mexico, accumulate trehalose. Aust J Bot 48:153–158CrossRefGoogle Scholar
  16. Kappen L, Valladares F (2007) Opportunistic growth and desiccation tolerance: the ecological success of poikilohydrous autotrophs. In: Pugnaire F, Valladares F (eds) Functional plant ecology, 2nd edn. CRC/Taylor and Francis Group, Boca Raton/London, pp 7–65Google Scholar
  17. Kluge M, Brulfert J (2000) Ecophysiology of vascular plants on inselbergs. In: Porembski S, Barthlott W (eds) Inselbergs: biotic diversity of isolated rock outcrops in tropical and temperate regions, vol 146, Ecological Studies. Springer, Berlin, pp 143–174Google Scholar
  18. Korall P, Kenrick P (2002) Phylogenetic relationships in Selaginellaceae based on rbcL sequences. Am J Bot 89:506–517PubMedCrossRefGoogle Scholar
  19. Kornás J (1977) Life-forms and seasonal patterns in the pteridophytes of Zambia. Acta Soc Bot Pol 46:669–690Google Scholar
  20. Nitta JH (2006) Distribution, ecology and systematics of the filmy ferns (Hymenophyllaceae) of Moorea (French Polynesia). University of California, Department of Integrative Biology, Berkeley, CAGoogle Scholar
  21. Phillips JR, Oliver MJ, Bartels D (2002) Molecular genetics of desiccation tolerant systems. In: Black M, Pritchard HW (eds) Desiccation and survival in plants: drying without dying. CABI Publishing, Wallingford, pp 319–341CrossRefGoogle Scholar
  22. Porembski S (2005) Epiphytic orchids on arborescent Velloziaceae and Cyperaceae: extremes of phorophyte specialisation. Nord J Bot 23:505–513CrossRefGoogle Scholar
  23. Porembski S (2006) Vegetative architecture of desiccation-tolerant arborescent monocotyledons. Aliso 22:129–134Google Scholar
  24. Porembski S, Barthlott W (1995) On the occurrence of a velamen radicum in tree-like Cyperaceae and Velloziaceae. Nord J Bot 15:625–629CrossRefGoogle Scholar
  25. Porembski S, Barthlott W (eds) (2000) Inselbergs: biotic diversity of isolated rock outcrops in tropical and temperate regions, vol 146, Ecological studies. Springer, BerlinGoogle Scholar
  26. Porembski S, Biedinger N (2001) Epiphytic ferns for sale: influence of commercial plant collection on the frequency of Platycerium stemaria (Polypodiaceae) in coconut plantations on the southeastern Ivory Coast. Plant Biol 3:72–76CrossRefGoogle Scholar
  27. Porembski S, Brown G, Barthlott W (1996) A species-poor tropical sedge community: Afrotrilepis pilosa mats on inselbergs in West Africa. Nord J Bot 16:239–245CrossRefGoogle Scholar
  28. Porembski S, Martinelli G, Ohlemüller R, Barthlott W (1998) Diversity and ecology of saxicolous vegetation mats on inselbergs in the Brazilian Atlantic rainforest. Divers Distrib 4:107–119CrossRefGoogle Scholar
  29. Pryer KM, Schuettpelz E, Wolf PG, Schneider H, Smith AR, Cranfill R (2004) Phylogeny and evolution of ferns (monilophytes) with a focus on the early leptosporangiate divergences. Am J Bot 91:1582–1598PubMedCrossRefGoogle Scholar
  30. Sazima M, Sazima I (1990) Humming bird pollination in two species of Vellozia (Liliiflorae, Velloziaceae) in southeastern Brazil. Bot Acta 103:83–86Google Scholar
  31. Schiller P, Wolf R, Hartung W (1999) A scanning electron microscopical study of hydrated and desiccated submerged leaves of the aquatic resurrection plant Chamaegigas intrepidus. Flora 194:97–102Google Scholar
  32. Szarzynski J (2000) Xeric islands. Environmental conditions on inselbergs. In: Porembski S, Barthlott W (eds) Inselbergs: biotic diversity of isolated rock outcrops in tropical and temperate regions, vol 146, Ecological Studies, Springer, Berlin, pp 37–48Google Scholar
  33. Tuba Z, Proctor MCF, Csintalan Z (1998) Ecophysiological responses of homiochlorophyllous desiccation tolerant plants: a comparison and an ecological perspective. Plant Growth Regul 24:211–217CrossRefGoogle Scholar
  34. van Vuuren SF (2008) Antimicrobial activity of South African medicinal plants. J Ethnopharmacol 119:462–472PubMedCrossRefGoogle Scholar
  35. Vicré M, Farrant JM, Driouich A (2004) Insights into the cellular mechanisms of desiccation tolerance among angiosperm resurrection plant species. Plant Cell Environ 27:1329–1340CrossRefGoogle Scholar
  36. Walter H (1931) Die Hydratur der Pflanze und ihre physiologisch-ökologische Bedeutung. Gustav Fischer, JenaGoogle Scholar
  37. Walters C, Farrant JM, Pammenter NW, Berjak P (2002) Desiccation stress and damage. In: Black M, Pritchard HW (eds) Desiccation and survival in plants: drying without dying. CABI Publishing, Wallingford, pp 263–291CrossRefGoogle Scholar
  38. Weber A (2004) Gesneriaceae. In: Kadereit JW (ed) The families and genera of vascular plants, vol 7, Flowering plants, dicotyledons: Lamiales (except Acanthaceae including Avicenniaceae). Springer, BerlinGoogle Scholar
  39. Zotz G, Andrade J-L (1998) Water relations of two co-occurring epiphytic bromeliads. J Plant Physiol 152:545–554Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  1. 1.Department of BotanyUniversität Rostock, Institute of BiosciencesRostockGermany

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