Morphological and biochemical responses of broccoli florets to supplemental ultraviolet-B illumination

•UV-B illumination decreased plant height, receptacle diameter and yield.•UV-B illumination increased ascorbic acid, sinigrin, total phenolics and total flavonoids.•Glucotropaeolin concentration was not affected by UV-B illumination. The effect of different doses of supplemental ultraviolet-B (UV-B)...

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Bibliographic Details
Published in:Agriculture, ecosystems & environment ecosystems & environment, 2018-05, Vol.259, p.1-10
Main Authors: Topcu, Yasin, Dogan, Adem, Sahin-Nadeem, Hilal, Polat, Ersin, Kasimoglu, Zehra, Erkan, Mustafa
Format: Article
Language:English
Subjects:
Agricultural economics
Antioxidants
Ascorbic acid
Broccoli
Carotenoids
Chlorophyll
Dry matter
Flowers & plants
Illumination
Leaves
Phenols
Plant growth
Plant stress
Secondary metabolite
Sinigrin
Ultraviolet astronomy
Ultraviolet radiation
UV-B
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Summary:•UV-B illumination decreased plant height, receptacle diameter and yield.•UV-B illumination increased ascorbic acid, sinigrin, total phenolics and total flavonoids.•Glucotropaeolin concentration was not affected by UV-B illumination. The effect of different doses of supplemental ultraviolet-B (UV-B) illumination on yield, plant growth, biochemical changes and antioxidant activity of broccoli florets was evaluated. The broccoli plants were grown under three different supplemental UV-B illumination doses (2.2, 8.8 and 16.4 kJ m−2 d−1) in the glasshouse. Plant height decreased with increasing supplementary UV-B illumination dose. However, leaf thickness increased with increasing UV-B dose. Chlorophyll content in the leaves also increased during the growing period. The lowest chlorophyll content was found at 16.4 kJ m−2 d−1 UV-B dose. Total yield decreased with supplemental illumination, especially at 16.4 kJ m−2 d−1 illuminated dose. Total dry matter, total soluble solids, carotenoids, chlorophyll a and b content in broccoli florets decreased with increasing UV-B illumination dose. Conversley, ascorbic acid, sinigrin, total phenolic, and flavonoid content and antioxidant activity increased in UV-B illuminated florets. Surprisingly, glucotropaeolin content, one of the forms of glucosinolate in broccoli, was not affected significantly by UV-B illumination or enhanced by UV-B illumination doses.
ISSN:0167-8809
1873-2305
DOI:10.1016/j.agee.2018.02.027