Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/86521
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Type: Journal article
Title: Genotypic variation in photosynthesis in cacao is correlated with stomatal conductance and leaf nitrogen
Author: Daymond, A.
Tricker, P.
Hadley, P.
Citation: Biologia Plantarum: journal for experimental botany, 2011; 55(1):99-104
Publisher: Institute of Experimental Botany of the Academy of Sciences of the Czech Republic
Issue Date: 2011
ISSN: 0006-3134
1573-8264
Statement of
Responsibility: 
A. J. Daymond, P. J. Tricker, P. Hadley
Abstract: Variation in photosynthetic parameters was observed between eight contrasting cacao (Theobroma cacao) genotypes. Net photosynthetic rate (PN) ranged from 3.4 to 5.7 μmol(CO2) m−2 s−1 for the genotypes IMC 47 and SCA 6, respectively. Furthermore, genotypic differences were detected in quantum efficiency ranging from 0.020 to 0.043 μmol(CO2) μmol−1(photon) for UF 676 and AMAZ 15/15, respectively. Differences in PN were correlated with both stomatal conductance (gs) and leaf nitrogen per unit area. Some variation in water use efficiency was observed between genotypes, both intrinsic (PN/gs) and instantaneous (PN/transpiration rate). Both measures of water use efficiency were a negative function of specific leaf area. Evidence was found for a trade-off mechanism between cacao genotypes in photosynthesis and leaf structure. High photosynthetic rate, expressed on a mass basis was associated with smaller leaves. Furthermore, thinner leaves were compensated for by a higher nitrogen content per unit mass.
Keywords: Light response curves, quantum efficiency, specific leaf area
Rights: © Springer, Part of Springer Science+Business Media
DOI: 10.1007/s10535-011-0013-y
Appears in Collections:Agriculture, Food and Wine publications
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