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Genetics of virulence and intraspecific interactions in Heterobasidion annosum s.l.

Lind, Mårten (2006). Genetics of virulence and intraspecific interactions in Heterobasidion annosum s.l. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2006:102
ISBN 91-576-7251-2
[Doctoral thesis]

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The present thesis summarizes and concludes the work of four separate studies on Heterobasidion annosum (Fr.) Bref. s.l.. The basic aim of these studies was to provide a tool for investigation and cloning of genetic regions in H. annosum s.l. and apply this tool to different regions of interest. The progeny isolates of a cross between North American intersterility groups S and P were used in an inoculation experiment on two-week-old Pinus sylvestris and demonstrated the nuclear contribution to be important for virulence. From the same population, a genetic linkage map was constructed based on 358 AFLP markers, consisting of 19 larger and 20 smaller linkage groups (LG). Based on further virulence tests on both one-year-old Pinus sylvestris and two-year-old Picea abies, several regions controlling virulence were identified and mapped to these LG. In particular, LG 15 was of interest, containing QTLs for pathogenicity to both pine and spruce. The tests also indicated that hybridization negatively affects virulence. An investigation of somatic incompatibility was conducted, using two heterokaryotic populations made from the progeny, backcrossed with a parental strain or crossed with an unrelated strain. The number of incompatibility loci was estimated to four and it was shown that the allelic differences alone are not enough to determine the degree of the incompatibility reaction. Furthermore, several strong QTLs for different intraspecific interactions that may be important to the incompatibility phenomenon were located. Future work includes map based cloning and investigation of the QTLs identified in this thesis; a task that will benefit substantially from the upcoming sequencing of the H. annosum s.l. genome.

Authors/Creators:Lind, Mårten
Title:Genetics of virulence and intraspecific interactions in Heterobasidion annosum s.l.
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2006
Number of Pages:36
ALLI. Olson, Å., Lind, M. and Stenlid, J. 2005. Genetic analysis of virulence in Heterobasidion annosum s.l., casual agent of conifer root rot. Forest pathology 35, 231-331. II. Lind, M., Olson, Å. and Stenlid, J. 2005. An AFLP-marker based genetic linkage map of Heterobasidion annosum locating intersterility genes. Fungal Genetics and Biology, 42, 519-527. III. Lind, M., Dalman, K., Stenlid, J., Karlsson, B. and Olson, Å. Identification of quantitative trait loci affecting virulence in Heterobasidion annosum s.l.. Manuscript. IV. Lind, M., Stenlid, J. and Olson, Å. Genetics and QTL mapping of somatic incompatibility and intraspecific interactions in the basidiomycete Heterobasidion annosum s.l.. Manuscript
Place of Publication:Uppsala
ISBN for printed version:91-576-7251-2
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:heterobasidion annosum, root rots, pathogenicity, genetic maps, loci, picea abies, pinus sylvestris
Keywords:Genetic linkage map, QTL, quantitative trait loci, intersterility, incompatibility, pathogenicity, forest pathogen
Permanent URL:
ID Code:1236
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: Mårten Lind
Deposited On:23 Oct 2006 00:00
Metadata Last Modified:02 Dec 2014 10:10

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