Toyoki Kozai, Kazuhiro Fujiwara, Erik S. Runkle (Editors): LED Lighting for Urban Agriculture. Springer, 2016.
Chapter 20, 275 - 286:
Light Quality Effects on Intumescence (Oedema) on Plant Leaves.
Kimberly A. Williams, Chad T. Miller, and Joshua K. Craver
Intumescence is a physiological disorder that is characterized by abnormal outgrowths of epidermal and/or palisade parenchyma cells on the leaf, petiole or stem surfaces of affected plants....
doi.org
Abstract: Intumescence is a physiological disorder that is characterized by abnormal outgrowths of epidermal and/or palisade parenchyma cells on the leaf, petiole or stem surfaces of affected plants. Intumescences are a different disorder than oedema based on anatomy of affected cells and causal agents. This disorder is most often observed on crops produced in controlled environments and has been reported on a wide range of plant species, including ornamental sweet potato (Ipomoea batatas), cuphea (Cuphea spp.) and solanaceous crops of tomato (Solanum lycopersicum) and potato (Solanum tuberosum). When susceptible crops are grown under ultraviolet-deficient environments, such as light-emitting diode (LED) sole-source lighting that supplies only red wavelengths, intumescences are most severe. However, the incidence of the disorder can be diminished or prevented if crops are grown in environments providing ample blue or ultraviolet wavelengths of light. End-of-day far-red lighting has also shown some promise in mitigating the disorder.
