Photosynthetica 2006, 44(2):235-240 | DOI: 10.1007/s11099-006-0013-x

Photoinhibition of photosynthesis in Minquartia guianensis and Swietenia macrophylla inferred by monitoring the initial fluorescence

D. P. Dias1, R. A. Marenco1,*
1 Instituto Nacional de Pesquisas da Amazônia, Coordenação de Pesquisas em Silvicultura Tropical, Manaus, AM, Brazil

We assessed the effect of the exposure to full sunlight (5, 35, and 120 min, i.e. T5, T35, and T120) on fluorescence parameters of two young tropical trees, Swietenia macrophylla, a gap-demanding species, and Minquartia guianensis, a shade tolerant species. Fluorescence parameters (F0, Fm, Fv/Fm) were recorded before treatments and after the transition to low irradiance (LI). Recovery from photoinhibition (measured as Fv/Fm) was monitored for 24 h at LI. In Swietenia, an almost complete restoration of the Fv/Fm values occurred in T5 and T35 plants, when a rise in F0 was observed after the transition to LI. This was inferred as indicative of dynamic photoinhibition. T120 led to a decline in F0 in Minquartia, but not in Swietenia. The plants of both species were unable to recovery from photoinhibition after 24 h at LI, when F0 declined or remained unchanged. This was interpreted as indicative of chronic photoinhibition. Compared with Swietenia, Minquartia was more susceptible to photoinhibition, as indicated by lower Fv/Fm values.

Additional key words: Amazonia; chlororespiration; chronic photoinhibition; dynamic photoinhibition; photodamage; photoprotection

Received: July 25, 2005; Accepted: December 15, 2005; Published: June 1, 2006  Show citation

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Dias, D.P., & Marenco, R.A. (2006). Photoinhibition of photosynthesis in Minquartia guianensis and Swietenia macrophylla inferred by monitoring the initial fluorescence. Photosynthetica, 44(2), 235-240. doi: 10.1007/s11099-006-0013-x
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