Polychromatic action spectrum for the induction of a mycosporine-like amino acid in a rice-field cyanobacterium, Anabaena sp.

被引:30
|
作者
Sinha, RP
Sinha, JP
Gröniger, A
Häder, DP
机构
[1] Univ Erlangen Nurnberg, Inst Bot & Pharmazeut Biol, D-91058 Erlangen, Germany
[2] Shriram Inst Ind Res, Delhi 7, India
关键词
Anabaena sp; high-performance liquid chromatography; mycosporine-like amino acid; photosynthetic active radiation; polychromatic action spectrum; shinorine; spectroscopy; ultraviolet radiation;
D O I
10.1016/S1011-1344(01)00274-3
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A polychromatic action spectrum for the induction of an ultraviolet-absorbing/screening mycosporine-like amino acid (MAA) has been determined in a filamentous and heterocystous nitrogen-fixing rice-field cyanobacterium, Anabaena sp. High-performance liquid chromatographic (HPLC) studies revealed the presence of only one type of MAA, which was identified as shinorine, a bisubstituted MAA containing both glycine and serine groups having a retention time at 2.8 min and an absorption maximum at 334 nm. Exposure of cultures to simulated solar radiation in combination with various cut-off filters (WG 280, 295, 305, 320, 335, 345, GG 400, 420, 455, 475, OG 515, 530, 570, RG 645, 665 and a broad-band filter, UG 11) clearly revealed that the induction of the MAA takes place only in the UV range. Photosynthetic active radiation (PAR) had no significant impact on MIAA induction. The ratio of the absorption at 334 nm (shinorine) to 665 nm (chlorophyll a) and the action spectrum also showed the induction of MAA to be UV dependent peaking in the UV-B range at around 290 nm. The results indicate that the studied cyanobacterium, Anabaena sp. may protect itself from deleterious short wavelength solar radiation by its ability to synthesize a mycosporine-like amino acid in response to UV-B radiation and thereby screen the negative effects of UV-B. (C) 2002 Elsevier Science BY All rights reserved.
引用
收藏
页码:47 / 53
页数:7
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