Photosynthetica 2008, 46(4):604-610 | DOI: 10.1007/s11099-008-0101-1

Leaf and photosynthetic characteristics of pioneer and forest species in tropical montane habitats

M. A. Sobrado1,*
1 Laboratorio de Biología Ambiental de Plantas, Departamento de Biología de Organismos, Universidad Simón Bolívar, Caracas, Venezuela

Gas exchange and chlorophyll a fluorescence measurements of expanding and adult leaves of four plant species were compared under field conditions. The pioneer species (PS) tended to have thinner leaves with lower nitrogen content and higher stomatal density compared to forest species (FS). Expanding leaves featured lower photosynthetic pigment contents and gas exchange capacity than adult leaves consistent with an immature photosynthetic apparatus. At the time of maximum irradiance, sun-exposed leaves of both PS and FS showed alteration of initial, variable, and maximum fluorescence as well as their ratios indicating photoinhibition. However, leaves recovered to some extent at predawn, suggesting the activation of photoprotective mechanisms. Sun-exposed leaves had comparable responses to high irradiance.

Additional key words: Chletra; chlorophyll a fluorescence; Croton; Ficus; intercellular CO2 concentration; leaf age; Oyedea; photoinhibition; photoprotection; stomatal conductance

Received: June 10, 2008; Accepted: September 8, 2008; Published: December 1, 2008  Show citation

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Sobrado, M.A. (2008). Leaf and photosynthetic characteristics of pioneer and forest species in tropical montane habitats. Photosynthetica46(4), 604-610. doi: 10.1007/s11099-008-0101-1
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