The response of CO2exchange rate to photosynthetic photon flux density for severalPopulusclones under laboratory conditions
✍ Scribed by R. Ceulemans; I. Impens; R. Moermans
- Publisher
- Springer
- Year
- 1980
- Tongue
- English
- Weight
- 431 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0166-8595
No coin nor oath required. For personal study only.
✦ Synopsis
No significant differences were found between four mathematical equations describing the response of CO 2 exchange rate to photosynthetic photon flux density in seven poplar clones under laboratory conditions. Choice of an optimal equation for poplar may be based on the contemplated aims. High significant differences (atp < 0.001) were found among the clones.
From all environmental factors, effects of photon flux density on CO2 exchange rates (PN) and consequently on growth have been most frequently reported [2,25]. Variations in response of CO2 exchange rate to photon flux density among different genotypes have been well documented [11,15] and have been used for comparing different genotypes and species [1,12]. In all these studies authors used various mathematical equations for describing response of PN to photon flux density, while others employed extensive studies on theoretical and mathematical derivations of these equations.
A mechanistic model of leaf photosynthetic response to photosynthetic photon flux density has been developed [21] and has since been discussed by many authors [7,8,9]. Based on the common Michaelis-Menten form and taking into account some general assumptions, Rabinowitch [21] could describe the PN-photon flux density relation by a non-rectangular hyperbola. Bliss and James [3], in their extensive biometrical study, described response of CO2 exchange rate to photon flux density by a rectangular hyperbola form, while Thornley [23] summarized different kinds of photon flux density response curves from literature in his work on mathematical models in plant physiology. Waggoner [24] also stated that a physico-chemical analysis of net CO2 exchange rate can produce a non-rectangular hyperbola,