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Rogério Teixeira de Faria ;Acta Scientiarum. Agronomy 2007, 29 3

Author: Celso Jamil Marur

Source: http://www.redalyc.org/articulo.oa?id=303026574019


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Acta Scientiarum.
Agronomy ISSN: 1679-9275 eduem@uem.br Universidade Estadual de Maringá Brasil Jamil Marur, Celso; Teixeira de Faria, Rogério A chamber for measurement of net photosynthesis on a whole plant Acta Scientiarum.
Agronomy, vol.
29, núm.
3, 2007, pp.
415-419 Universidade Estadual de Maringá Maringá, Brasil Available in: http:--www.redalyc.org-articulo.oa?id=303026574019 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative A chamber for measurement of net photosynthesis on a whole plant Celso Jamil Marur1* and Rogério Teixeira de Faria2 1 Instituto Agronômico do Paraná, Área de Ecofisiologia, Rod.
Celso Garcia Cid, Km 375, 86001-970, Três Marcos, Londrina, Paraná, Brazil.
2Instituto Agronômico do Paraná, Área de Engenharia Agrícola, Londrina, Paraná, Brazil.
*Author for correspondence.
E-mail: cjmarur@iapar.br ABSTRACT.
A limitation for quantifying photosynthesis with existing equipment is that they were designed to measure of plant parts, such as one leaf or group of few leaves, which has a great variability over the whole plant.
As a consequence, it is difficult to integrate accurately the measurements taken on plant parts in order to assess the process over the entire plant.
The objectives of this work were to show in detail a chamber built to measure whole plant photosynthesis and present measurements taken with this apparatus on coffee plants under field conditions.
The chamber makes possible to obtain reliable measurements of CO2 assimilation rates over canopies of different LAI and levels of light exposure.
The plant with LAI equal to 1.84 had higher assimilation rates for the whole canopy, but autoshading decreased assimilation rates per leaf area unit, as compared with the plant with LAI of 0.86. ...





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