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Carl-Otto Ottosen

Using artificial lighting based on electricity price without a negative impact on growth, visual quality or stomatal closing response in Passiflora

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  • Helle Kjærsgaard Sørensen
  • ,
  • Dimitrios Fanourakis, Giannakakis SA, Hellenic Mediterranean University
  • ,
  • Georgios Tsaniklidis, NAGREF
  • ,
  • Dimitris Bouranis, Agricultural University of Athens
  • ,
  • Abdolhossein Rezaei Nejad, Lorestan University
  • ,
  • Carl Otto Ottosen

Employing supplementary light (SL) with increased energy efficiency would reduce cultivation costs of greenhouse grown crops. Prior to implementation, however, the plant response to the resultant dynamic cost-efficient light regime ought to be addressed. This response was examined in two Passiflora genotypes by evaluating growth, chlorophyll fluorescence of (expanding and fully-expanded) leaves, as well as stomatal anatomy (density, index, size and pore dimensions) and gas exchange response to evaporative demand. The control plants received fixed day length SL, whereas other plants received a cost-efficient light regime with fluctuating periods of SL based on forecasted solar irradiance and electricity price. The dynamic cost-efficient light pattern neither impeded flower development nor delayed the flowering time in either genotype. Dynamic light promoted (22 %) biomass accumulation in one genotype, which also exhibited increased (34,8 %) assimilation rate over a large evaporative demand range (7–18 mb). Stomatal anatomical traits and the quantum efficiency of open photosystem II centers (Fv/Fm) were not affected by the light regime. Although both genotypes exhibited increased stomatal conductance (25–44 %) under the dynamic cost-efficient light regime, the stomatal response to evaporative demand was not attenuated. These results indicate that SL can be dynamically scheduled without compromising either the external quality traits or the control of water loss in Passiflora pot plants.

OriginalsprogEngelsk
Artikelnummer109354
TidsskriftScientia Horticulturae
Vol/bind267
ISSN0304-4238
DOI
StatusUdgivet - 1 jun. 2020

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