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Ecological consequences of plant hybridization in willows

inheritance patterns of secondary compounds and herbivore foraging behaviour

Hallgren, Per (2002). Ecological consequences of plant hybridization in willows. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230 ; 259
ISBN 91-576-6343-2
[Doctoral thesis]

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Official URL: http://www.abc.se/~m11032


Segregation of genetic variation into species is traditionally viewed as the principal unit of evolution while intraspecific hybridization was regarded as a mistake in nature. Nevertheless, intraspecific hybridization is common between many plant species and recent studies have suggested that hybridization may be beneficial to individuals. hybridization is also of interest as it influence species that are interacting with the hybridising species, for example herbivores that need to decide whether or not to forage on hybrids between host plants and non-host plants. To understand how herbivores are influenced by hybridization, and how herbivory influences hybrid plants, I have studied the inheritance of plant resistance characters, foraging preference and performance of herbivores (leaf beetles and voles) and the degree of herbivore damage on pure and hybrid willows. The studied willow species, Salix caprea, S. repens and S. aurita differ in secondary metabolite composition. The results show that both studied groups of secondary metabolites, phenolic glucosides and condensed tannins, are additively inherited in hybrids between S. repens and S. caprea, while condensed tannins are equal in S. caprea, S. aurita and hybrids between the two parental species (Paper I and II). There is no common response of the studied herbivore community. Instead, it seems that specialist herbivores either discriminate against hybrids and non-host parental species or do not separate between hybrids and host parental species. In contrast, generalists usually show either intermediate preference for hybrids, or do not discriminate between hybrids and parental species. One generalist species shows a preference that indicates a breakdown in resistance (Paper II, III, and IV). When adding together the effects of all herbivores, it appears that herbivores inflict more damage to hybrids than parental species (Thesis, paper II and VI).

Authors/Creators:Hallgren, Per
Title:Ecological consequences of plant hybridization in willows
Subtitle:inheritance patterns of secondary compounds and herbivore foraging behaviour
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :April 2002
Number of Pages:24
ALLI.* Hallgren, P, Ikonen, I, Hjältén, J. and Roininen, H. 2003. Inheritance patterns of phenolics in F1, F2 and back-cross hybrids of willows: implications for herbivore responses to hybrid plants. J. Chem. Ecol. 29(5) II. Hjältén, J. Hallgren, P. Qian, H. 2002. The importance of parent host status for hybrid susceptibility to herbivores: A test with two hybrid lines of willows. Ecoscience 9 (3): 339-346 III. Hallgren, P. and Hjältén, J. Feeding preference of eight leaf beetle species for Salix caprea, S. repens and F1 hybrids. Manuscript. IV. Hallgren, P. and Hjältén, J. Vole preference for Salix caprea, S. repens and their F1, F2 and backcross hybrids. Manuscript. V. Hallgren, P. Effects of willow hybridization and simulated browsing on the growth and survival of the leaf beetle Phratora vitellinae. Manuscript. VI. Hjältén, J. Hallgren, P. The resistance of hybrid willows to specialist and generalist herbivores and pathogenes: the potential role of secondary chemistry and parent host plant status. in Wagner, M. R., Clancy, K. M., Lieutier, F. and Paine, T. D. (eds.), Mechanisms and Deployment of Resistance in Trees to Insects, pp. 153-168, Kluwer Academic Publishers, Dordrecht. * Paper I have been published after the thesis was printed.
Place of Publication:Umeå
ISBN for printed version:91-576-6343-2
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L20 Animal ecology
Subjects:Not in use, please see Agris categories
Agrovoc terms:salix caprea, intraspecific hybridization, herbivores, voles, leaf eating insects, genetic inheritance, resistance to injurious factors, feeding preferences, secondary metabolites
Keywords:Leaf beetles, voles, performance, preference, plant resistence, phenolics, phenolic glucosides, condensed tannins
Permanent URL:
ID Code:237
Department:(S) > Institutionen för skoglig zooekologi
Deposited By: Per Hallgren
Deposited On:14 Apr 2003 00:00
Metadata Last Modified:02 Dec 2014 10:02

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