Photosynthetic Adaptation to Temperature in C3 and C4 Grasses: A Possible Ecological Role in the Shortgrass Prairie 12
AUTOR(ES)
Williams, George J.
RESUMO
Increasing pretreatment day temperatures of 20, 30, and 40 C resulted in decreased net photosynthesis in Agropyron smithii (C3) while in Bouteloua gracilis (C4) net photosynthesis was increased. The effect on photosynthesis of increasing analysis temperatures was the same as observed by increasing pretreatment temperatures. Resistance of the stomata and boundary layer were less affected by pretreatment temperatures than were the remaining resistances of a physical and chemical nature. Resistances for A. smithii were increased and those for B. gracilis were decreased by increasing pretreatment temperatures. Phenology of the species in the shortgrass prairie is such that A. smithii has its greatest growth activity during the cool portion of the growth season, whereas B. gracilis is most active in the warm portion. Thus, photosynthetic adaptation to temperature is strongly suggested as a strategy for ecosystem utilization by reduction of interspecific competition.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=366587Documentos Relacionados
- Establishing a grassland signature in veins: 18O in the leaf water of C3 and C4 grasses
- Response of C3 and C4 plants to middle-Holocene climatic variation near the prairie–forest ecotone of Minnesota
- Cell position and light influence C4 versus C3 patterns of photosynthetic gene expression in maize.
- Unusual C3 and C4 metabolism in the chemoautotroph Alcaligenes eutrophus.
- Oxygen Requirement and Inhibition of C4 Photosynthesis1 : An Analysis of C4 Plants Deficient in the C3 and C4 Cycles