Abstract
Diurnal changes in net photosynthetic rate (P N), chlorophyll (Chl) fluorescence, and stomatal aperture of several hybrid poplar clones subjected to midday light stress were measured in July and August of 1996. Midday depression of P N, photosystem 2 (PS2) efficiency, stomatal conductance (g s), and stomatal aperture was observed in all clones, though at differing rates among them. Non-uniform stomatal closure occurred at noon and at other times, requiring a modification of intercellular CO2 concentration (C 1). A linear relationship was found between g s and stomatal aperture. More than half of the photons absorbed by PS2 centre dissipated thermally when subjected to light stress at noon. There was a linear relationship between the rate of PS2 photochemical electron transport (PxPFD) and P N. There was a consensus for two fluorescence indicators (1 − qP/qN and (Fm' − F)/Fm') in assessment of susceptibility of photoinhibition in the clones. According to P N, Chl fluorescence, and stomatal aperture, we conclude that midday depression of photosynthesis can be attributed to both stomatal and non-stomatal limitations.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Asada, K., Takahashi, M.: Production and scavenging of active oxygen in photosynthesis.-In: Kyle, D.J., Osmond, C.B., Arntzen, C.J. (ed.): Photoinhibition. Pp. 227–287. Elsevier, Amsterdam-New York-Oxford 1987.
Bilger, W., Björkman, O.: Role of the xanthophyll cycle in photoprotection elucidated by measurements of light induced absorbance changes, fluorescence and photosynthesis in leaves of Hedera canariensis.-Photosynth. Res. 25: 173–185, 1990.
Chaves, M.M.: Effects of water deficits on carbon assimilation.-J. exp. Bot. 42: 1–16, 1991.
Demmig-Adams, B., Adams, W.W., III, Barker, D.H., Logan, B.A., Bowling, D.R., Verhoeven, A.S.: Using chlorophyll fluorescence to assess the fraction of absorbed light allocated to thermal dissipation of excess excitation.-Physiol. Plant. 98: 253–264, 1996a.
Demmig-Adams, B., Gilmore, A.M., Adams, W.W., III: In vivo functions of carotenoids in higher plants.-FASEB J. 10: 403–412, 1996b.
Downton, W.J.S., Loveys, B.R., Grant, W.J.R.: Stomatal closure fully accounts for the inhibition of photosynthesis by abscisic acid.-New Phytol. 108: 263–266, 1988a.
Downton, W.J.S., Loveys, B.R., Grant, W.J.R.: Non-uniform stomatal closure induced by water stress causes putative non-stomatal inhibition of photosynthesis.-New Phytol. 110: 503–509, 1988b.
Farquhar, G.D.: Models of integrated photosynthesis of cells and leaves.-Phil. Trans. roy. Soc. London B 323: 357–367, 1989.
Farquhar, G.D., Sharkey, T.D.: Stomatal conductance and photosynthesis.-Annu. Rev. Plant Physiol. 33: 317–345, 1982.
Genty, B., Briantais, J.-M., Baker, N.R.: The relationship between the quantum yield of photosynthetic electron transport and quenching of chlorophyll fluorescence.-Biochim. biophys. Acta 900: 87–92, 1989.
Laisk, A.: Calculation of leaf photosynthetic parameters considering the statistical distribution of stomatal apertures.-J. exp. Bot. 34: 1627–1635, 1983.
Laisk, A., Oja, V., Kull, K.: Statistical distribution of stomatal apertures of Vicia faba and Hordeum vulgare and the Spannungsphase of stomatal opening.-J. exp. Bot. 31: 49–58, 1980.
Matos, M.C., Matos, A.A., Mantas, A., Cordeiro, V., Vieira da Silva, J.B.: Diurnal and seasonal changes in Prunus amygdalus gas exchanges.-Photosynthetica 35: 517–524, 1998.
Ögren, E.: Prediction of photoinhibition of photosynthesis from measurements of fluorescence quenching components.-Planta 184: 538–544, 1991.
Osmond, C.B., Grace, S.C.: Prospectives on photoinhibition and photorespiration in the field: quintessential inefficiencies of the light and dark reactions of photosynthesis?-J. exp. Bot. 46: 1351–1362, 1995.
Schreiber, U.: Detection of rapid induction kinetics with a new type of high-frequency modulated chlorophyll fluorometer.-Photosynth. Res. 9: 261–272, 1986.
Schreiber, U., Neubauer, C.: Correlation between dissipative fluorescence quenching at photosystem II and 50 μs recombination luminiscence.-FEBS Lett. 258: 339–342, 1989.
Terashima, I.: Anatomy of non-uniform leaf photosynthesis.-Photosynth. Res. 31: 195–212, 1992.
Terashima, I., Wong, S.-C., Osmond, C.B., Farquhar, G.D.: Characterisation of non-uniform photosynthesis induced by abscisic acid in leaves having different mesophyll anatomies.-Plant Cell Physiol. 29: 385–394, 1988.
Van Kooten, O., Snel, J.F.H.: The use of chlorophyll fluorescence nomenclature in plant stress physiology.-Photosynth. Res. 25: 147–150, 1990.
Winter, K., Lesch, M.: Diurnal changes in chlorophyll a fluorescence and carotenoid composition in Opuntia ficus-indica, a CAM plant, and in three C3 species in Portugal during summer.-Oecologia 91: 505–510, 1992.
Zhang, S., Gao, R.: Study on the stomatal ecophysiological characters of two new clones of Sect. Leuce.-Acta ecol. sin. 18: 358–363, 1998.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Zhang, S., Gao, R. Diurnal Changes of Gas Exchange, Chlorophyll Fluorescence, and Stomatal Aperture of Hybrid Poplar Clones Subjected to Midday Light Stress. Photosynthetica 37, 559–571 (2000). https://doi.org/10.1023/A:1007119524389
Issue Date:
DOI: https://doi.org/10.1023/A:1007119524389