DOI: 10.1034/j.1399-3054.1999.100302.x. Epidermal transmittance and phenolic composition in leaves of atrazine‐tolerant and atrazine‐sensitive cultivars of <i>Brassica napus</i> grown under enhanced UV‐B radiation

Epidermal transmittance and phenolic composition in leaves of atrazine‐tolerant and atrazine‐sensitive cultivars of Brassica napus grown under enhanced UV‐B radiation

10.1034/j.1399-3054.1999.100302.x

Crossref journal-article

Wiley

Physiologia Plantarum (311)

Abstract

Experiments were conducted on the atrazine‐tolerant mutant Stallion and the atrazine‐sensitive cv. Paroll of Brassica napus L., which were grown under either visible light or with the addition of UV‐B radiation (280–320 nm) for 15 days. The mutant has been shown to be sensitive to high levels of visible light as compared to the atrazine‐sensitive cultivar and therefore we wished to determine plant response to UV‐B radiation with respect to potential pigment changes, certain anatomical features, radiation penetration and partial photosynthesis. With regard to pigment changes, we were particularly interested in whether the compositional shift in flavonol pigments under enhanced UV‐B radiation, previously suggested to favour increased antioxidant activity, is confined to the adaxial epidermis, which generally receives most UV‐B radiation or whether the pigment shift is also inducible in the abaxial epidermis.As was to be expected, the penetration of UV‐B radiation (310 nm) was lower in the UV‐B‐exposed plants, which was correlated with an increased amount of UV‐screening pigments in the adaxial and abaxial epidermal layers. The main flavonoid glycosides showed the largest shift from kaempferol to quercetin as aglycone moiety in the adaxial epidermal layer. However, in the abaxial epidermal layer the hydroxycinnamic acid (HCA) derivatives and kaempferol glycosides were predominant. Penetration of 430 nm light was higher after UV‐B exposure, and probably contributed to the fact that photosynthetic efficiency of photosystem II was unchanged or higher after UV‐B exposure. UV‐B radiation decreased leaf area in the atrazine‐tolerant mutant only. Both cultivars showed an increased leaf thickness after UV‐B exposure due to cell elongation mainly of the palisade tissue. This was especially evident in the mutant.

Bibliography

Olsson, L. C., Veit, M., & Bornman, J. F. (1999). Epidermal transmittance and phenolic composition in leaves of atrazineâtolerant and atrazineâsensitive cultivars of Brassica napus grown under enhanced UVâB radiation. Physiologia Plantarum, 107(3), 259â266. Portico.

Authors 3

Louise C. Olsson (first)
Markus Veit (additional)
Janet F. Bornman (additional)

References 33 Referenced 55

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Dates

Type	When
Created	22 years, 5 months ago (March 12, 2003, 1:26 p.m.)
Deposited	1 year, 2 months ago (June 29, 2024, 5:53 a.m.)
Indexed	3 weeks, 3 days ago (Aug. 5, 2025, 9:10 a.m.)
Issued	25 years, 9 months ago (Nov. 1, 1999)
Published	25 years, 9 months ago (Nov. 1, 1999)
Published Online	23 years, 7 months ago (Jan. 4, 2002)
Published Print	25 years, 9 months ago (Nov. 1, 1999)

Funders 0

None

BibTeX

@article{Olsson_1999, title={Epidermal transmittance and phenolic composition in leaves of atrazine‐tolerant and atrazine‐sensitive cultivars of Brassica napus grown under enhanced UV‐B radiation}, volume={107}, ISSN={1399-3054}, url={http://dx.doi.org/10.1034/j.1399-3054.1999.100302.x}, DOI={10.1034/j.1399-3054.1999.100302.x}, number={3}, journal={Physiologia Plantarum}, publisher={Wiley}, author={Olsson, Louise C. and Veit, Markus and Bornman, Janet F.}, year={1999}, month=nov, pages={259–266} }

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