Reporting estimates of maximum potential electron transport rate
Reporting estimates of maximum potential electron transport rate
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DOI：
10.1111/nph.13018
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发表时间：
2015-01-01
期刊：
影响因子：
9.4
通讯作者：
Diaz-Espejo, Antonio
中科院分区：
文献类型：
--
作者：
Buckley, Thomas N.;Diaz-Espejo, Antonio
The C3 photosynthesis model of Farquhar, von Caemmerer & Berry (1980) is widely used to predict CO2 exchange and inform ecophysiological research. Users typically estimate the model’s parameters by fitting it to response curves–a process fraught with potential errors and ambiguities (Long & Bernacchi, 2003; Dubois et al., 2007; Flexas et al., 2007; Rodeghiero et al., 2007; Sharkey et al., 2007; Kattge et al., 2009; Miao et al., 2009; Pons et al., 2009; Guet al., 2010; Gilbertet al., 2012; Tholenet al., 2012). This letter concerns a widespread but simple ambiguity in photosynthetic parameter estimation that has largely eluded attention. Maximum potential electron transport rate (Jmax) is often estimated by fitting the photosynthesis model to CO2 response curves obtained at high photosynthetic photon flux (i), then inferring the potential electron transport rate (J) from the fitted model and reporting this estimate (J at high i, or Jhigh) as Jmax. If Jhigh is subsequently applied to the model, an error will result if an asymptotic submodel for the response of J to i is employed–that is, a submodel in which J approaches Jmax but never reaches it (eg Fig. 1). The most common J versus i submodel is a nonrectangular hyperbola, in which J is calculated as the lesser root of a quadratic equation, hjÁJ2 À ðJmax þ/iÞÁJ þ JmaxÁ/i ¼ 0 (Farquhar & Wong, 1984), or
