Supplementary UV-A and UV-B radiation differentially regulate morphology in Ocimum basilicum

Qian, MinjieÖrebro Life Science Center, School of Science and Technology, Örebro University, Örebro, Sweden; School of Horticulture, Hainan University, Haikou, China,Biokemi (författare)

UV-A- or UV-B-enriched growth light were given to basil plants at non-stress-inducing intensities. UV-A-enriched growth light gave rise to a sharp rise in expression of PAL and CHS genes in leaves, an effect that rapidly declined after 1-2 days of exposure. On the other hand, leaves of plants grown in UV-B-enriched light had a more stable and long-lasting increase in expression of these genes and also showed a stronger increase in leaf epidermal flavonol content. UV supplementation of growth light also led to shorter more compact plants with a stronger UV effect the younger the tissue. The effect was more prominent in plants grown under UV-B-enriched light than in those grown under UV-A. Parameters particularly affected were internode lengths, petiole lengths and stem stiffness. In fact, the bending angle of the 2nd internode was found to increase as much as 67% and 162% for plants grown in the UV-A- and UV-B-enriched treatments, respectively. The decreased stem stiffness was probably caused by both an observed smaller internode diameter and a lower specific stem weight, as well as a possible decline in lignin biosynthesis due to competition for precursor by the increased flavonoid biosynthesis. Overall, at the intensities used, UV-B wavelengths are stronger regulators of morphology, gene expression and flavonoid biosynthesis than UV-A wavelengths.

Kalbina, Irina,1961-Örebro universitet,Institutionen för naturvetenskap och teknik,Örebro Life Science Center,Biokemi(Swepub:oru)ika (författare)
Rosenqvist, Eva,1960-Section of Crop Sciences, Department of Plant and Environmental Sciences, University of Copenhagen, Taastrup, Denmark (författare)
Jansen, Marcel A. K.,1962-School of Biological, Earth and Environmental Sciences, Environmental Research Institute, University College Cork, North Mall, Cork, Ireland (författare)
Strid, Åke,Professor,1960-Örebro universitet,Institutionen för naturvetenskap och teknik,Örebro Life Science Center,Biokemi(Swepub:oru)aesd (författare)
Örebro Life Science Center, School of Science and Technology, Örebro University, Örebro, Sweden; School of Horticulture, Hainan University, Haikou, ChinaBiokemi (creator_code:org_t)

Ingår i:Photochemical and Photobiological Sciences: Springer22:9, s. 2219-22301474-905X1474-9092

Av författaren/redakt...: Qian, Minjie; Kalbina, Irina, ...; Rosenqvist, Eva, ...; Jansen, Marcel A ...; Strid, Åke, Prof ...

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