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AOBPreview originally published online on September 16, 2004
Annals of Botany 2004 94(5):725-732; doi:10.1093/aob/mch197
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Annals of Botany 94/5, © Annals of Botany Company 2004; all rights reserved

Species-specific Variation in the Importance of the Spectral Quality Gradient in Canopies as a Signal for Photosynthetic Resource Partitioning

THIJS L. PONS* and YVONNE E. M. de JONG-VAN BERKEL

Department of Plant Ecophysiology, Utrecht University, PO Box 800.84, NL-3508 TB Utrecht, The Netherlands

* For correspondence. E-mail T.L.Pons{at}bio.uu.nl

Received: 25 May 2004    Returned for revision: 13 July 2004    Accepted: 4 August 2004    Published electronically: 16 September 2004

• Background and Aims Plants adjust the distribution of photosynthetic capacity and chlorophyll to canopy density. The importance of the gradient in the red : far-red ratio (R : FR) relative to the irradiance gradient was studied for its perception with respect to this partitioning of photosynthetic resources. Whether the relative importance of these two signals varied between six species of different growth habit (Phaseolus vulgaris, Lysimachia vulgaris, Hedera helix, Ficus benjamina, Carex acutiformis and Brachypodium pinnatum) was investigated further.

• Methods Single leaves of plants were shaded in daylight by a spectrally neutral filter or a leaf. In another experiment, leaves were treated with supplemental FR. In most cases, treatment effects were evaluated after 2 weeks.

• Key Results Nitrogen and photosynthetic capacity (Amax) per leaf area, parameters pertaining to between-leaf resource partitioning, were strongly reduced in neutral shade but not additionally by spectral leaf shade. Supplemental FR reduced these parameters also, except in Carex. Acceleration of induction of senescence was observed in spectral leaf shade in primary bean leaves. Amax per unit chlorophyll, a parameter pertaining to within-leaf resource partitioning, was reduced in neutral shade, but not in spectral leaf shade or supplemental FR.

• Conclusions Signalling mechanisms associated with perception of the R : FR gradient in canopies were less important than those associated with the irradiance gradient for between-leaf and within-leaf partitioning of photosynthetic resources. The relative importance of the signals differed between species because Carex was the only species for which no indications were found for an involvement of the spectral gradient in perception of canopy density.

Key words: Chlorophyll, herbaceous dicotyledonous species, irradiance, leaf canopies, light gradient, monocotyledonous species, photosynthetic capacity, photosynthetic resource partitioning, red : far-red ratio, spectral quality, shade acclimation, woody species


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A. Boonman, E. Prinsen, F. Gilmer, U. Schurr, A. J.M. Peeters, L. A.C.J. Voesenek, and T. L. Pons
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