Effects of Temperature and CO(2) Enrichment on Carbon Translocation of Plants of the C(4) Grass Species Echinochloa crus-galli (L.) Beauv. from Cool and Warm Environments.

摘要: Plants of Echinochloa crus-galli from Quebec and Mississippi were grown under two thermoperiods (28 degrees C/22 C, 21 C/15 C) atmospheric CO(2) concentrations (350 675 microliters per liter) to examine possible differential responses northern southern populations this C(4) grass species. Translocation was monitored using radioactive tracing with short-lived (11)C. enrichment induced a decrease in the size export pool plants both populations. Other parameters did not strongly respond elevated CO(2). Low temperature reduced translocation drastically for normal concentration, but reduction ameliorated at high Overall, had higher (11)C activity leaf phloem percentage exported, whereas these lower turnover time smaller than population.