The aerial environment modulates plant responses to blue light
The optimal amount of blue light (BL) in the light spectrum varies depending on plant species, plant process, and the background environment. The aim of this study was to investigate plant responses to BL in different aerial environments. In controlled production systems, such as greenhouses with reduced ventilation and air movement, high relative air humidity (RH>85%) is common. Such an environment inhibits plant transpiration and nutrient uptake and may have a negative impact on stomatal function and plant quality. In a number of experiments, we investigated the response to BL in different air humidity regimes. The results show that plants grown under high RH (90%) use BL more efficiently compared with those grown under moderate RH (60%). At high RH, plant growth and leaf quality of basil (Ocimum basilica), cucumber (Cucumis sativus) and tomato (Lysopersicon esculentum) improved with increased amounts of BL (5→30%). We conclude that manipulation of BL can be used as a cultivation strategy to improve plant productivity and quality in an environment with high RH.
Innes, S.N., Jakobsen, S.B., Niday, A., Ali, H., Arve, L.E. and Torre, S. (2018). The aerial environment modulates plant responses to blue light. Acta Hortic. 1227, 525-532
air humidity, blue light, chlorophyll, nitrogen, stomata, transpiration