Effects of elevated ultraviolet-B radiation on a plant-herbivore interaction.
Enhanced ultraviolet-B (UV-B) radiation may have multiple effects on both plants and animals and affect plant-herbivore interactions directly and indirectly by inducing changes in host plant quality. In this study, we examined combined effects of UV-B and herbivory on the defence of the mountain birch (Betula pubescens ssp. czerepanovii) and also the effects of enhanced UV-B radiation on a geometrid with an outbreak cycle: the autumnal moth (Epirrita autumnata). We established an experiment mimicking ozone depletion of 30% (a relevant level when simulating ozone depletion above Northern Lapland). Both arctic species responded only slightly to the enhanced level of UV-B radiation, which may indicate that these species are already adapted to a broader range of UV-B radiation. UV-B exposure slightly induced the accumulation of myricetin glycosides but had no significant effect on the contents of quercetin or kaempferol derivatives. Mountain birch seedlings responded more efficiently to herbivory wounding than to enhanced UV-B exposure. Herbivory induced the activities of foliar oxidases that had earlier been shown to impair both feeding and growth of moth larvae. In contrast, the contents of foliar phenolics did not show the same response in different clones, except for a decrease in the contents of tannin precursors. The induction of foliar phenoloxidase activities is a specific defence response of mountain birches against insect herbivory. To conclude, our results do not support the hypothesis that the outbreak cycle of the autumnal moth can be explained by the cycles of solar activity and UV-B.
Anttila
Ulla
U
Section of Ecology, Department of Biology, University of Turku, 20014, Turku, Finland.
Julkunen-Tiitto
Riitta
R
Rousi
Matti
M
Yang
Shiyong
S
Rantala
Markus J
MJ
Ruuhola
Teija
T
D000818:Animals; D029662:Betula / Q000201:enzymology / Q000469:parasitology / Q000528:radiation effects*; D005247:Feeding Behavior; D006790:Host-Parasite Interactions / Q000528:radiation effects*; D007814:Larva / Q000528:radiation effects; D014442:Monophenol Monooxygenase / Q000378:metabolism; D009036:Moths / Q000528:radiation effects*; D010636:Phenols / Q000378:metabolism*; D036226:Seedlings / Q000201:enzymology / Q000469:parasitology / Q000528:radiation effects; D014466:Ultraviolet Rays
D010636:Phenols; D014442:Monophenol Monooxygenase
Environ Pollut. 2005 Oct;137(3):404-14
16005754
J Chem Ecol. 1992 Jul;18(7):1125-37
24254153
Anal Biochem. 1976 May 7;72:248-54
942051
Eur J Cell Biol. 1995 Dec;68(4):450-6
8690025
Plant Cell. 1995 Sep;7(9):1357-68
8589621
J Chem Ecol. 2007 Mar;33(3):463-75
17268825
J Chem Ecol. 1995 Oct;21(10):1511-30
24233680
Annu Rev Entomol. 1997;42:611-43
9017902
J Chem Ecol. 2007 Jun;33(6):1160-76
17502999
Bioessays. 2000 May;22(5):469-80
10797487
Oecologia. 2000 Jan;122(1):20-28
28307952
J Chem Ecol. 2001 Aug;27(8):1595-615
11521399
Oecologia. 2008 Jan;154(4):725-30
17952472
J Anim Ecol. 2007 Mar;76(2):269-75
17302834
J Chem Ecol. 1989 Dec;15(12):2667-94
24271680
Oecologia. 1988 Mar;75(2):185-189
28310832
Chem Biol Interact. 1999 Aug 30;122(1):15-25
10475612
Environ Pollut. 2007 Jan;145(1):348-54
16678318
J Chem Ecol. 2001 Apr;27(4):779-89
11446300
Proc Natl Acad Sci U S A. 1999 Feb 2;96(3):980-5
9927679
Ann Bot. 2007 Jan;99(1):103-9
17210605
Ann Bot. 2006 Jan;97(1):29-37
16254021
Ecology. 2006 Feb;87(2):291-6
16637353
Oecologia. 2003 Oct;137(2):312-20
12908105
Oecologia. 1985 Aug;67(1):52-56
28309845
Photochem Photobiol Sci. 2003 Jan;2(1):29-38
12659537
Chemosphere. 2008 May;71(10):1840-4
18359060
J Chem Ecol. 1996 Nov;22(11):2023-40
24227214
Oecologia. 2003 Jul;136(2):161-8
12684856
Plant Physiol. 2000 Sep;124(1):285-95
10982443
Environ Pollut. 2001;112(2):215-20
11234538
J Photochem Photobiol B. 1998 Oct;46(1-3):5-19
9894350
Proc Biol Sci. 2004 Sep 22;271(1551):1897-901
15347511
Oecologia. 1979 Jan;39(2):151-159
28309433
Heredity (Edinb). 2007 May;98(5):329-36
17314921
Physiol Plant. 2001 Aug;112(4):552-558
11473716