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Jun 11, 2013

One of the clearest changes is earlier onset of spring and lengthening of the growing season. We designed the present study to examine the interactive effects of timing of dormancy release of seeds with low and high atmospheric CO2 on biomass, reproduction, and phenology in ragweed plants (Ambrosia artemisiifolia L.), which produce highly allergenic pollen.

Timing and CO2 interacted to influence pollen production. At ambient CO2 levels, the earlier cohort acquired a greater biomass, a higher average weight per inflorescence, and a larger number of inflorescences; flowered earlier; and had 54.8% greater pollen production than did the latest cohort. At high CO2 levels, plants showed greater biomass and reproductive effort compared with those in ambient CO2 but only for later cohorts. In the early cohort, pollen production was similar under ambient and high CO2, but in the middle and late cohorts, high CO2 increased pollen production by 32% and 55%, respectively, compared with ambient CO2 levels. Overall, ragweed pollen production can be expected to increase significantly under predicted future climate conditions.

Suggested Citation

Christine A. Rogers, P Wayne, E Macklin, M L. Muilenberg, C W. Wagner, P R. Epstein, and F A. Bazzaz. "Interaction of the Onset of Spring and Elevated Atmospheric CO2 on Ragweed (Ambrosia artemisiifolia L.) Pollen Production" Environmental Health Perspectives 114.6 (2006): 865-869.
Available at: http://works.bepress.com/christine_rogers/8

 
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Posted: Tuesday June 11, 2013, 5:46 pm
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marjolein s.
female, age 62, committed relationship, 2 children
Amsterdam, Noordholland, Netherlands
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