Diurnal physiological behavior of seedlings in the Amazon rainforest: generalist versus specialist species of shade and sun
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Dec 30, 2020
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Abstract
The regenerative success of generalist and specialist species may be due to differences in their physiology. Measurements of stomatal conductance (gS) provide an efficient way to infer immediate physiological responses of plants to diurnal environment variation. Radiation, air temperature, and relative humidity were measured in the Colombian Amazon rainforest, to identify the extreme environmental conditions that limit the gS of seedlings in three site types: small gap, open forest, and closed forest. We hypothesized that the diurnal physiological performance of generalist species must be plastic in these three environments. Morphological traits, gS, and leaf temperature were evaluated in seedlings of four species: one generalist, common to all sites, and one specialist from each site. The gap site was warmer and more irradiated than the other two sites, which caused several midday physiological depressions, limited seedling survival, and facilitated the specialized strategy. Leaf and air temperatures were strong determinants of overall gS. The generalist species was physiologically plastic and, at some hours of the day, more efficient than the specialists from open forest and
closed forests. This factor interplay could allow the coexistence of both types of plants.
Keywords
leaf temperature, seedling, shade-tolerance, stomatal conductance, Heliophyte, gap dynamics
References
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maple–beech forests, Oecologia, 162(1): 153-161, 2010.
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doi: 10.1017/S0266467403001251
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doi: 10.1007/s11258-004-5775-2
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doi: 10.1126/science.283.5401.554
Ishii H, Ohsugi Y. Light acclimation potential and carry-over effects vary among three evergreen tree species with contrasting patterns of leaf emergence and maturation, Tree Physiology, 31(8): 819-830, 2011.
doi: 10.1093/treephys/tpr079
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doi: 10.1093/treephys/tpq102
Kosugi Y, Takanashi S, Yokoyama N, Philip E, Kamakura M. Vertical variation in leaf gas exchange parameters for a Southeast Asian tropical rainforest in Peninsular Malaysia, Journal of Plant Research, 125(6): 735-748, 2012.
doi: 10.1007/s10265-012-0495-5
Krause GH, Koroleva OY, Dalling JW, Winter K. Acclimation of tropical tree seedlings to excessive light in simulated tree-fall
gaps, Plant Cell and Environment, 24(12): 1345-1352, 2001.
doi: 10.1046/j.0016-8025.2001.00786.x
Lambers H, Chapin III FS, Pons TL. Plant physiological ecology. Springer, New York, 2008.
doi: 10.1007/978-0-387-78341-3
Larcher W. Physiological plant ecology. Springer, Berlin, 2003. Leakey ADB, Press MC, Scholes JD. High-temperature inhibition of photosynthesis is greater under sunflecks that uniform irradiance in a tropical rain forest tree seedling, Plant Cell and Environment, 26(10): 1681-1690, 2003.
doi: 10.1046/j.1365-3040.2003.01086.x
Leite ITA, Takaki M. Phytochrome and temperature control of seed germination in Muntingia calabura L.(Elaeocarpaceae).
Brazilian Archives of Biology and Technology, 44(3): 297-302, 2001.
doi: 10.1590/S1516-89132001000300012
Lobo E, Dalling JW. Effects of topography, soil type and forest age on the frequency and size distribution of canopy gap disturbances in a tropical forest, Biogeosciences, 10(4): 6769-6781, 2013.
doi: 10.5194/bgd-10-7103-2013
Luken JO, Kuddes LM, Tholemeier TC. Response of understory species to gap formation in soil disturbance in Lonicera maackii thickets, Restoration Ecology, 5(3): 229-235, 2008.
doi: 10.1046/j.1526-100X.1997.09727.x
Malagón CD. Minerología de algunos suelos Colombianos, Suelos Ecuatoriales, 8: 316-321, 1997.
Martínez-Ramos M. Claros, ciclos vitales de los árboles tropicales y regeneración natural de las selvas altas perennifolias. Pages 191- 239 in A. Gómez-Pompa and S. D. Amo, editors. Claros, ciclos vitales de los árboles tropicales y regeneración natural de las selvas altas perennifolias. INIREB, Alhambra, 1985.
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How to Cite
Ramos-Montaño, C., Vanegas-Cano, L. J., Cárdenas-Avella, N. M., Pulido-Herrera, K. L., & Buitrago-Puentes, S. P. (2020). Diurnal physiological behavior of seedlings in the Amazon rainforest: generalist versus specialist species of shade and sun. Universitas Scientiarum, 25(3), 489–516. https://doi.org/10.11144/Javeriana.SC25-3.dpbo
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