Photosynthetica 2006, 44(1):46-52 | DOI: 10.1007/s11099-005-0157-0

Partial compensation in Psychotria marginata (Rubiaceae) after simulated defoliation increases photon capture and photosynthesis

D. Galvez1,3, A. Cohen-Fernandez2
1 Departamento de Psicologia, Universidad Magna, Q. Roo, Mexico
2 Sylvatica, Q. Roo, Mexico
3 Smithsonian Tropical Research Institute, Balboa, Republica de Panama

We used Y-plant, a computer-based model of plant crown architecture analysis, to simulate effects of defoliation on daily canopy carbon gain in Psychotria marginata (Rubiaceae) plants under two contrasting irradiances. Five levels of defoliation were simulated using two different types of leaf blade damage. Compensatory increases in photon-saturated photosynthetic capacity (Pmax) of 25, 50, and 100 % defoliation were also simulated. In all simulations daily photon capture and CO2 assimilation increased with defoliation. However, without a compensatory response, daily canopy carbon gain also decreased with defoliation. Under high irradiance, reduction in daily canopy carbon gain was less than what would be expected if the response was proportional to leaf area reduction. Thus, 25 and 50 % defoliation resulted in only 20 and 41 % of daily canopy carbon gain reduction, respectively. In the scenario where 25 % of the leaf area was removed, if the Pmax value was increased by 25 %, the remaining leaves compensated for 94 % of the daily canopy carbon relative to an undamaged non-compensated plant. At the same defoliation level, incrementing Pmax values by 50 and 100 % resulted in overcompensation. Hence, because the increment of daily photon capture and CO2 assimilation after defoliation was more a passive consequence of the reduction in leaf area than an active response, under the conditions tested photosynthetic compensation could be only possible through an active mechanism such as the increment of Pmax values.

Additional key words: computer modelling; daily carbon gain; photon capture

Received: March 24, 2005; Accepted: June 23, 2005; Published: March 1, 2006  Show citation

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Galvez, D., & Cohen-Fernandez, A. (2006). Partial compensation in Psychotria marginata (Rubiaceae) after simulated defoliation increases photon capture and photosynthesis. Photosynthetica, 44(1), 46-52. doi: 10.1007/s11099-005-0157-0
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