Distribution and accumulation of ultraviolet-radiation-absorbing compounds in leaves of tropical mangroves

Lovelock C.E., Clough B.F. and Woodrow I.E. (1992) Distribution and accumulation of ultraviolet-radiation-absorbing compounds in leaves of tropical mangroves. Planta, 188 2: 143-154. doi:10.1007/BF00216808


Author Lovelock C.E.
Clough B.F.
Woodrow I.E.
Title Distribution and accumulation of ultraviolet-radiation-absorbing compounds in leaves of tropical mangroves
Journal name Planta   Check publisher's open access policy
ISSN 0032-0935
Publication date 1992
Sub-type Article (original research)
DOI 10.1007/BF00216808
Volume 188
Issue 2
Start page 143
End page 154
Total pages 12
Publisher Springer-Verlag
Language eng
Subject 1110 Nursing
Abstract Ultraviolet (UV)-absorbing phenolic compounds that have been shown to be protective against the damaging: effects of UV-B radiation (Tevini et al., 1991, Photochem. Photobiol. 53, 329-333) were found in the leaf epidermis of tropical mangrove tree species. These UV-absorbing phenolic compounds and leaf succulence function as selective filters, removing short and energetic wavelengths. A field survey showed that the concentration of UV-absorbing compounds varied between species, between sites that would be experiencing similar levels of UV radiation, and between sun and shade leaves. Sun leaves have greater contents of phenolic compounds than shade leaves, and more saline sites have plants with greater levels in their leaves than less saline sites. In addition, increases in leaf nitrogen contents and quantum yields did not correlate with increasing levels of UV-absorbing compounds. It was concluded from these results that although UV-absorbing compounds form a UV-screen in the epidermis of mangrove leaves, UV radiation may not be the only factor influencing the accumulation of phenolic compounds, thus an experiment which altered the level of UV radiation incident on mangrove species was done. Near ambient levels of UVA and UV-B radiation resulted in a greater content of UV-absorbing compounds in Bruguiera parviflora (Roxb.) Wight and Arn. ex Griff., but did not result in increases in B. gymnorrhiza (L.) Lamk or Rhizophora apiculata Blume. Total chlorophyll contents were lower in R. apiculata when it was grown under near-ambient levels of UV radiation than when it was grown under conditions of UV-A and UV-B depletion, but no differences were observed between the UV radiation treatments in the other two species. There was no difference in leaf morphology, carotenoid/chlorophyll ratios, or chlorophyll a/b ratios between UV treatments, although these varied among species; B. parviflora had the highest carotenoid/chlorophyll ratio and R. apiculata had the lowest. Thus it is proposed that differences in species response tu UV radiation may be influenced by their ability to dissipate excess visible solar radiation.
Keyword Carotenoid
Leaf (sun/shade)
Mangrove
Nitrogen nutrition
Phenolic compounds (UV absorbing)
Ultraviolet radiation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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Citation counts: TR Web of Science Citation Count  Cited 62 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 15 May 2014, 18:21:31 EST by Professor Catherine Lovelock