TY - JOUR
T1 - Using artificial lighting based on electricity price without a negative impact on growth, visual quality or stomatal closing response in Passiflora
AU - Sørensen, Helle Kjærsgaard
AU - Fanourakis, Dimitrios
AU - Tsaniklidis, Georgios
AU - Bouranis, Dimitris
AU - Nejad, Abdolhossein Rezaei
AU - Ottosen, Carl Otto
PY - 2020/6/1
Y1 - 2020/6/1
N2 - 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.
AB - 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.
KW - Biomass
KW - Dynamic cost-efficient lighting
KW - Irregular lighting
KW - Stomata
UR - https://www.scopus.com/pages/publications/85081214830
U2 - 10.1016/j.scienta.2020.109354
DO - 10.1016/j.scienta.2020.109354
M3 - Journal article
AN - SCOPUS:85081214830
SN - 0304-4238
VL - 267
JO - Scientia Horticulturae
JF - Scientia Horticulturae
M1 - 109354
ER -