Effects of elevated CO2on intra-specific competition in Sinapis alba: an examination of the role of growth responses to red:far-red ratio
| Autor: | E. G. Reekie, J. E. Cowan |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Canopy
Light Coefficient of variation media_common.quotation_subject Sinapis Far-red Plant Science General Medicine Carbon Dioxide Biology Photosynthesis biology.organism_classification Competition (biology) Plant Leaves Shade avoidance Nutrient Animal science Botany Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Plant Biology. 10:202-210 |
| ISSN: | 1438-8677 1435-8603 |
| Popis: | Response of plants to elevated CO2 differs markedly between individually- and competitively-grown plants, both in terms of mean size and variation about the mean. Using Sinapis alba, we explored whether these contrasting effects are a consequence of the effect of competition on the red:far red (R:FR) light ratio. Plants were grown at both ambient and elevated (700 microl.l(-1)) CO2 in competitive stands, and as individuals at either a low (0.7) or high (1.25) R:FR ratio at a constant photosynthetic photon fluence rate. Elevated CO2 increased stand biomass by enhancing the growth of canopy dominants, but not the subordinates. As a consequence, elevated CO2 increased the coefficient of variation in size within the stands. Elevated CO2 did not enhance the growth of individually-grown plants at the low R:FR ratio, but did at the high R:FR ratio. Both the poor response of subordinate plants to elevated CO2 and the increased size inequalities of individuals within the stand can be explained in terms of the effect of the R:FR ratio on CO2 responsiveness. The effect of the R:FR ratio on CO2 response may be related to its effect on allocation patterns and nutrient uptake. |
| Databáze: | OpenAIRE |
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