Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 426847
Title Leaf photosynthetic and morphological responses to elevated CO2 concentration and altered fruit number in the semi-closed greenhouse
Author(s) Qian, T.; Dieleman, J.A.; Elings, A.; Marcelis, L.F.M.
Source Scientia Horticulturae 145 (2012). - ISSN 0304-4238 - p. 1 - 9.
Department(s) Horticultural Supply Chains
WUR GTB Gewasfysiologie Management en Model
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) high atmospheric co2 - ribulose-1,5-bisphosphate carboxylation limitation - carbon-dioxide concentrations - dynamic simulation-model - dry-matter production - tomato plants - stomatal conductance - gas-exchange - closed greenhouse - whole-plant
Abstract Semi-closed greenhouses have been developed to reduce the energy consumption in horticulture. In these greenhouses, CO2 concentration is higher than in the conventional modern greenhouses due to the reduction of window ventilation. Photosynthetic and morphological acclimation to elevated CO2 has been found in many plant species with feedback inhibition being the main mechanism to explain this. The aim of this study was to investigate the occurrence of photosynthetic and morphological acclimation to elevated CO2 concentration in the semi-closed greenhouse. Our hypothesis was that photosynthetic and morphological acclimation to elevated CO2 concentration only occurred in plants with low sink strength. Experiments were carried out with tomato plants with varying fruit loads in a semi-closed greenhouse and a conventional modern greenhouse. Our results showed that photosynthetic acclimation to elevated CO2 concentration only occurred when the number of fruits was considerably reduced. Elevated CO2 as well as fruit removal reduced specific leaf area. Reduction in photosynthesis rate was associated with, but not caused by reduced stomatal conductance. The increase of dry matter production in the semi-closed greenhouse was mainly explained by a higher CO2 concentration compared to the open greenhouse. We suggested that elevated CO2 concentrations in the semi-closed greenhouse do not cause feedback inhibition in high producing crops, because the plants have sufficient sink organs (fruits) to utilise the extra assimilates
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