By Klaus Winter, J.Andrew C. Smith
Crassulacean acid metabolism (CAM) represents one of many best-studied metabolic examples of an ecological version to environmental tension. good over five % of all vascular plant species interact during this water-conserving photosynthetic pathway. Intensified examine actions over the past 10 years have ended in significant advances in realizing the biology of CAM vegetation.
New parts of study reviewed intimately during this booklet comprise legislation of gene expression and the molecular foundation of CAM, the ecophysiology of CAM crops from tropical environments, the productiveness of agronomically very important cacti and agaves, the ecophysiology of CAM in submerged aquatic vegetation, and the taxonomic range and evolutionary origins of CAM.
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Extra resources for Crassulacean Acid Metabolism: Biochemistry, Ecophysiology and Evolution
1982), against which can be set the energy savings resulting from suppression of photorespiration. The net result appears to be that the energetic cost of carbon assimilation in CAM plants does not differ greatly from those in C 3 plants (Chaps. 16, 24 and 25). Indeed, although plants exhibiting CAM are most common in high-light environments, several species occur in deeply shaded parts of tropical forests (Winter et al. 1986; Medina 1987). Much of our understanding of the ecological significance of CAM has been derived from work on desert cacti, which have been the subject of detailed study since the beginning of this century (Nobel 1988).
We tentatively conclude that massive futile cycling through PEPC occurs, creating an extraordinary demand for ATP. Chlorophyll fluorescence quenching analyses (Winteret al. 1990; see also Chap. 6) during these interruptions to the dark period may prove instructive. Earlier studies suggest that fluorescence transients are significantly altered in Phase I (Osmond 1982; Everson et al. 1983; Chap. 6). 3. Stimulation of COz uptake when leaf discs of K. 5 h dark 1rc, 4 h dark 6 h dark COz fixation (Ilmo!
In: Groombridge B (ed) Global diversity: status of the earth's living resources. Chapman & Hall, London, pp 64-87 Atwood JT lr (1986) The size of the Orchidaceae and the systematic distribution of epiphytic orchids. Selbyana 9: 171-186 Benzing DH (1990) Vascular epiphytes: general biology and related biota. Cambridge Univer~ sity Press, Cambridge Benzing DH, Ott DW (1981) Vegetative reduction in epiphytic Bromeliaceae and Orchidaceae: its origin and significance. Biotropica 13: 131-140 Bohnert Hl, Ostrem lA, Cushman lC, Michalowski CB, Rickers 1, Meyer G, DeRocher El, Vernon DM, Krueger M, Vasquez-Moreno L, Velten 1, Hoefner R, Schmitt 1M (1988) Mesernbryanthernurn crystallin urn: a higher plant model for the study of environmentally induced changes in gene expression.