Clonal differences in growth and phenolics of willows exposed to elevated ultraviolet-B radiation

Tegelberg, Riitta; Veteli, Timo O.; Aphalo, Pedro J.; Julkunen‐Tiitto, Riitta

doi:10.1078/1439-1791-00150

Cited by 46 publications

(46 citation statements)

References 30 publications

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“…In late August, the fifth, sixth and seventh leaves, counting downward from the shoot tip, were cut off at the petiole. The fifth and seventh leaves were used for insect bioassays, and the sixth leaf was dried for 2 weeks at room temperature and stored at 18C for analyses of leaf quality which are reported with the analysing methods in more detail in the parallel study by Tegelberg et al (2003). The concentrations of total compound classes in this study are the sum of individual compounds within each of the classes in the study of Tegelberg et al (2003).…”

Section: Leaf Quality Analysesmentioning

confidence: 99%

“…The fifth and seventh leaves were used for insect bioassays, and the sixth leaf was dried for 2 weeks at room temperature and stored at 18C for analyses of leaf quality which are reported with the analysing methods in more detail in the parallel study by Tegelberg et al (2003). The concentrations of total compound classes in this study are the sum of individual compounds within each of the classes in the study of Tegelberg et al (2003). Nitrogen content of the leaves was measured from dried pieces of leaf using a nitrogen analyser (Leco FP-528, Leco, St. Joseph, Mich., USA).…”

Section: Leaf Quality Analysesmentioning

confidence: 99%

“…UV-B radiation has clear detrimental effects on organisms; for example, it has been shown to cause tumours in mammal skin and to reduce the photosynthesis of plants, retarding their growth and altering their leaf anatomy and chemistry (e.g. Kootstra 1994;Caldwell et al 1995;Gwynn-Jones and Johanson 1996;Lavola et al 1997Lavola et al , 2000Rozema et al 1997;Allen et al 1998;Gonzµlez et al 1998;Lavola 1998;Nagel et al 1998;Day et al 1999;Liakoura et al 1999;De la Rosa et al 2001;Searles et al 2001;Tegelberg et al , 2003. UV-B enhancement affects the concentration of UV-B-absorbing compounds, e.g.…”

Section: Introductionmentioning

confidence: 98%

“…At the same time there was a parallel study with the same experimental set-up in which the clonal variation of plant growth and chemical composition in response to UV-B was examined (Tegelberg et al, 2003). Here, more specifically, we asked whether increased UV-B radiation affects (1) the quality of willows as food for insect herbivores, (2) the abundance and distribution of insect herbivores on different willow species, (3) the amount of leaf damage caused by the insect herbivores, and (4) the performance of insect larvae feeding on the exposed plant tissue.…”

Section: Introductionmentioning

confidence: 99%

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Interactions between willows and insect herbivores under enhanced ultraviolet-B radiation

et al. 2003

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We studied the effects of elevated ultraviolet-B radiation on interactions between insect herbivores and their host plants by exposing two species of phytochemically different willows, Salix myrsinifolia and S. phylicifolia, to a modulated increase in ultraviolet radiation in an outdoor experiment and monitoring the colonisation of insect herbivores on these willows. We examined the effect of increased ultraviolet-B (UV-B) radiation on (1) the quality of willow leaves, (2) the distribution and abundance of insect herbivores feeding on these willows, (3) the resulting amount of damage, and (4) the performance of insect larvae feeding on the exposed plant tissue. Six clones of each of the two willow species were grown in eight blocks for 12 weeks in the UV-B irradiation field. The clones were exposed to a constant 50% increase in UV-B radiation (simulating 20-25% ozone depletion), to a small increase in UV-A radiation or to ambient solar irradiation. We allowed colonisation on the willows by naturally occurring insects, but also introduced adults of a leaf beetle, Phratora vitellinae, a specialist herbivore on S. myrsinifolia. Increased UV-B radiation did not affect any of the measured indices of plant quality. However, numbers of P. vitellinae on S. myrsinifolia were higher in plants with UV-B treatment compared with UV-A and shade controls. In laboratory tests, growth of the second-instar larva of P. vitellinae was not affected by UV-B treatment of S. myrsinifolia, but was retarded on UV-B treated leaves of S. phylicifolia. In addition, naturally occurring insect herbivores were more abundant on willows exposed to elevated UV-B radiation compared to those grown under control treatments. In spite of the increased abundance of insect herbivores, willows treated with elevated UV-B did not suffer more herbivore damage than willows exposed to ambient solar radiation (shade control). The observed effects of UV-B on herbivore abundance, feeding and growth varied significantly due to spatial variation in environment quality, as indicated by the UV-treatment x block interaction. The results suggest that (1) environmental variation modifies the effects of UV-B radiation on plant-insect interactions and (2) specialist herbivores might be more sensitive to chemical changes in their secondary host plants (S. phylicifolia) than to changes in their primary hosts (S. myrsinifolia).

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Section: Leaf Quality Analysesmentioning

confidence: 99%

Section: Leaf Quality Analysesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Interactions between willows and insect herbivores under enhanced ultraviolet-B radiation

et al. 2003

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“…and Betula sp. leaves on enhanced UV-B radiation (Tegelberg et al, 2003;Keski-Saari et al, 2005). Generally, tannins have a great importance at cellular level as well as in plant physiology and ecology.…”

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confidence: 99%