Altitude-related changes in activities of carbon metabolism enzymes in Rumex nepalensis.

Activities of some enzymes related to carbon metabolism were studied in different ecotypes of Rumex nepalensis growing at 1 300, 2 250, and 3 250 m above mean sea level. Activities of ribulose-1,5-bisphosphate carboxylase/ oxygenase, phosphoenolpyruvate carboxylase, aspartate aminotransferase, and glutamine synthetase increased with altitude, whereas activities of malate dehydrogenase, NAD-malic enzyme, and citrate synthase did not show a significant difference with change in altitude

Altitudinal ecotypes in Hawaiian Metrosideros

Reports were scanned in black and white at a resolution of 600 dots per inch and were converted to text using Adobe Paper Capture Plug-in.Hawaiian Metrosideros distribution extends from tropical to cool-temperature climates throughout the six major islands of the Hawaiian Island chain. It forms a highly polymorphic complex that occurs in a continuous distribution over areas with average annual rainfalls ranging from 30 to 450 inches and at elevations from sea-level to 8500 feet, and in diverse pedological and topographical habitats. All of these plants are probably derived from one or a very small number of ancestral introductions that arrived within the last 20 million years by long distance dispersal. Seeds collected from diverse altitudinal sites on the islands of Hawaii and Maui and grown under uniform greenhouse conditions show evidence of ecotypic differentiation along altitudinal gradients. The seedlings, although from islands separated by 50 miles of ocean, show a parallelism in their altitudinal intra-population variation that strongly overlaps from site to site.Support for research on this paper was made possible by NSF GB 23230