Isoprenoid emissions,photosynthesis and mesophyll diffusion conductance in response to blue light |
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| Affiliation: | 1. Institute of Agroenvironmental and Forest Biology, National Research Council, Via Salaria km 29.300, 00015 Monterotondo Scalo, RM, Italy;2. Department of Forest Environment and Resources, University of Tuscia, Via San Camillo de Lellis, 01100 Viterbo, Italy;3. Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria;4. Dipartimento di Bioscienze e Territorio, Università degli Studi del Molise, Contrada Fonte Lappone, 86090 Pesche, IS, Italy;5. Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences, Kreutzwaldi 1, Tartu 51014, Estonia;6. Institute for Plant Protection, National Research Council, Via Madonna del Piano 10, 50019 Sesto Fiorentino, Firenze, Italy;1. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China;2. College of Territorial Resources and Tourism, Anhui Normal University, Wuhu 241000, China;1. Service de neurologie, centre hospitalier de Pau, 4, boulevard Hauterive, 64046 Pau, France;2. Unité de mycologie moléculaire, centre national de référence mycoses invasives et antifongiques, Institut Pasteur, 25–28, rue du Docteur Roux, 75724 Paris cedex 15, France;3. CNRS URA3012, Institut Pasteur, 25–28, rue du Docteur Roux, 75724 Paris cedex 15, France;4. Service de maladies infectieuses et tropicales, centre d’infectiologie Necker-Pasteur, 149, rue de Sèvres, 75743 Paris cedex 15, France;1. Servicio de Dermatología, Hospital Arnau de Vilanova, Valencia, España;2. Servicio de Microbiología, Hospital Arnau de Vilanova, Valencia, España;3. Servicio de Anatomía Patológica, Hospital Arnau de Vilanova, Valencia, España;1. Department of Laboratory Medicine UZ Leuven, Leuven, Belgium;2. Department of Microbiology and Immunology KU Leuven, Leuven, Belgium;3. Department of Epidemiology and Infection Control, UZ Leuven, Leuven, Belgium;4. Department of Nephrology, UZ Leuven, Leuven, Belgium;5. Department of Internal Medicine, UZ Leuven, Leuven, Belgium;6. Department of Orthopaedics, UZ Leuven, Leuven, Belgium |
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| Abstract: | The effects of blue light (BL) on leaf gas exchange of Populus × canadensis, a strong isoprene emitter, and Quercus ilex and Citrus reticulata, two monoterpene emitters with respectively small and large storage pools for monoterpenes, were studied. Leaves were initially exposed to a saturating photosynthetic photon flux density (PPFD) of white light (WL), which was then progressively reduced to perform WL-response curves. Leaves acclimated to saturating WL were then quickly exposed to equivalent BL levels to perform BL-response curves. Blue light did not significantly affect photosynthetic parameters in the light-limited portion of the PPFD-response curves in both P. × canadensis and Q. ilex. Whereas photosynthesis (A), stomatal conductance (gs), and mesophyll conductance (gm) were significantly decreased at high PPFDs of BL. A was similarly inhibited by BL in C. reticulata, but there was no significant effect of light quality on gs. Overall these results show that the negative effect of BL on photosynthesis is widespread in tree species with different leaf characteristics, and that this involves coordinated reductions in gs and gm. BL negatively affected isoprene emission and, to a lesser extent monoterpene emissions, in concert with photosynthetic inhibition. Interesting, both isoprene and monoterpene emissions were shown to be inversely dependent upon intercellular [CO2]. These results indicate that a change in light spectral quality, which can vary during the day, between days and within seasons, can alter photosynthesis and isoprenoid emissions, depending on the PPFD intensity. Such effects should be strongly considered in photosynthesis and volatile isoprenoid emission models. |
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| Keywords: | Diffusive limitations to photosynthesis Isoprenoids Light quality Mandarin Oak Poplar |
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