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

Functional Plant Biology : FPB
María Arróniz-CrespoNathalie Beaucourt

Abstract

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.) Váña 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-β-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 (NP...Continue Reading

References

Mar 7, 2003·Phytochemistry·Jochen M ScherHans Becker
Mar 28, 2003·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Richard L McKenzieMohammad Ilyasad
Nov 3, 2004·Environmental Pollution·S HuttunenJ Turunen
Jul 12, 2005·Environmental Pollution·Minna Turunen, Kirsi Latola
Mar 1, 2001·Oecologia·Peter S SearlesMartyn M Caldwell
Aug 1, 2002·Functional Plant Biology : FPB·Brian R Jordan

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Citations

Mar 1, 2009·Functional Plant Biology : FPB·Johanna D TurnbullSharon A Robinson
May 14, 2014·Journal of the Science of Food and Agriculture·María-Ángeles Del-Castillo-AlonsoEncarnación Núñez-Olivera
Feb 5, 2016·Journal of Experimental Botany·John A Raven, Timothy D Colmer

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