Physiological changes and UV protection in the aquatic liverwort Jungermannia exsertifolia subsp cordifolia along an altitudinal gradient of UV-B radiation

被引:31
作者
Arroniz-Crespo, Maria
Nunez-Olivera, Encarnacion
Martinez-Abaigar, Javier
Becker, Hans
Scher, Jochen
Zapp, Josef
Tomas, Rafael
Beaucourt, Nathalie
机构
[1] Univ La Rioja, Logrono 26006, La Rioja, Spain
[2] Univ Saarland, D-66041 Saarbrucken, Germany
关键词
altitude; bryophytes; caffeic acid derivatives; liverworts; mountain streams; secondary metabolites; ultraviolet-absorbing compounds; ultraviolet-B;
D O I
10.1071/FP06096
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Here we report the effects of a natural altitudinal gradient of UV-B radiation, from 1140 to 1816 m altitude, on the physiology of the aquatic liverwort Jungermannia exsertifolia Steph. subsp. cordifolia (Dumort.) Va (n) over tildea collected in mountain streams. Photosynthetic pigments, net photosynthesis and dark respiration rates, chlorophyll fluorescence, protein concentration, sclerophylly, and UV-absorbing compounds [both global UV absorbance of methanol-extractable UV-absorbing compounds (MEUVAC) and concentrations of five individual compounds] were measured. Two new caffeic acid derivatives were discovered: 5''-(7'',8''-dihydroxycoumaroyl)-2-caffeoylmalic acid and 5''-(7'',8''-dihydroxy-7-O-beta-glucosyl-coumaroyl)-2-caffeoylmalic acid, whereas three additional compounds were already known in other species: p-coumaroylmalic acid, phaselic acid ( both compounds in their cis- and trans- forms) and feruloylmalic acid. Most physiological variables changed considerably along the altitudinal gradient, but only six showed significant linear relationships with altitude: MEUVAC levels, the concentrations of the two new secondary compounds, the maximal apparent electron transport rate through PSII (ETRmax) and the maximal non- photochemical quenching (NPQ(max)) increased with altitude, whereas photoinhibition percentage decreased. A principal components analysis (PCA) was conducted to rank the values of the physiological and ecological variables obtained along the altitudinal transect, showing that those variables correlated with altitude were responsible for the ordination of the sampling points. The liverwort was not adversely affected by the changing conditions along the altitudinal gradient and, in particular, by the increasing UV-B irradiance, probably because the characteristics shown by high-altitude populations may confer tolerance to high UV-B levels. The response to UV-B of the two new compounds suggests that they could be used as indicators of the spatial changes in UV-B radiation.
引用
收藏
页码:1025 / 1036
页数:12
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