UV-B supplementation to mitigate intumescence injury of tomato seedlings

• Published in: Horticulture, environment and biotechnology 2023, Environment, and Biotechnology, 64(6), , pp.917-926
• Main Authors: Myung, Jeesang, Pham, Minh Duy, Hwang, Hyunseung, Lee, Byungkwan, Lee, Hyein, Cui, Meiyan, Shin, Jaewook, Chun, Changhoo
• Format: Article
• Language: English
• Subjects: Agriculture; Air temperature; Biomedical and Life Sciences; Cultivars; Cultivation; Fruit cultivation; growth promotion; Leaf area; Leaves; Life Sciences; Light; Light emitting diodes; Light intensity; lighting; Luminous intensity; Plant breeding; Plant Breeding/Biotechnology; Plant Ecology; Plant Physiology; Relative humidity; Research Report; rootstocks; scions; Seedlings; Solanum lycopersicum; Stems; Tomatoes; Ultraviolet radiation; White light; 농학
• ISSN: 2211-3452; 2211-3460
• DOI: 10.1007/s13580-023-00537-8

Intumescence occurs on the leaves and stems of tomato ( Solanum lycopersicum Mill.) seedlings grown under ultraviolet (UV) deficient light environments, such as in a plant factory with artificial lighting (PFAL). Supplemental UV-B alleviates intumescence incidence and modulates plants mophology and photomorphogenic responses. UV-B supplementation is required to suppress intumescence injury and determine the morphological and growth responses for each tomato cultivar cultivated in PFAL. ‘Doterang Dia’ and ‘B-blocking’, which were cultivars used as scion and rootstock, were grown in a PFAL with white light emitting diodes (LEDs) at a light intensity of 180 µmol m −2  s −1 for 16 h d −1 , an air temperature of 25/20 o C and a relative humidity of 70/90% (photo/dark periods) for 21 days. UV-B light was supplemented to each cultivar at 0 (Control), 0.05, 0.10, or 0.15 W m −2 for 3 h per day. The intumescence incidence rate was measured by the percentage of intumescent leaflets for all leaflets. The intumescence incidence of ‘B-blocking’ decreased significantly under UV-B radiation. The incidence rate was lower than 1% under supplemental UV-B radiation with an intensity of 0.1 W m −2 and 0.15 W m −2 . The stem length, leaf area, and dry weights of shoots and roots were greater at UV-B intensities of 0.05 and 0.1 W m −2 than those in control and decreased at 0.15 W m −2 to the same level as the control. In comparison to ‘B-blocking’, intumescence incidence rates for ‘Doterang Dia’ showed low values, but it also showed a decreasing tendency with supplemental UV-B light similar to that of ‘B-blocking’. The stem lengths of ‘Doterang Dia’ were greater at a UV-B intensity of 0.05 W m −2 than those in control and decreased with higher UV-B radiation. The result suggests that supplementing of the small range of UV-B radiation can reduce the intumescence incidence while modulating growth promotion in tomato seedlings. The different cultivar-specific responses to UV-B light between scion and rootstock cultivars could be due to the genetic differences among their major breeding resources developed from other areas with different levels of UV-B radiation.