Chestnut blight fungus (Cryphonectria parasitica Murrill Barr) ; diversity and impact on sweet chestnut (Castanea sativa Mill.) populations

Ježić, Marin (2013) Chestnut blight fungus (Cryphonectria parasitica Murrill Barr) ; diversity and impact on sweet chestnut (Castanea sativa Mill.) populations. Doctoral thesis, Faculty of Science > Department of Biology.

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Abstract

Nine populations of sweet chestnut pathogen Cryphonectria parasitica, from Croatia and Slovenia were genotyped using 11 microsatellite markers. Data analysis revealed high gene diversity of this pathogen in the studied area. Therefore a hypothesis of two independent introduction events of this fungus in the area of Croatia and Slovenia was proposed: the first one from west during the 1950's, and the second from southeast, probably occurring later. Historical data indicate the Lovran county as the first place where chestnut blight was observed in Croatia, therefore Lovran orchard/forest with naturally growing chestnuts and grafted marrons was further studied. Microsatellite analysis of the chestnuts showed a very diverse natural population as well as clonal origin of the marron, a cherished chestnut cultivar. Besides that, an unexpectedly large number of active cankers as well as the lack of healing cankers – calli, was observed on marrons, despite of presence of hypovirulent strains of C. parasticia in this area. This research revealed that, unlike naturally growing trees, the marrons recovery from this disease is much slower.

Item Type: Thesis (Doctoral thesis)
Keywords: chestnut blight, population genetics, microsatellite markers, biological control
Supervisor: Ćurković Perica, Mirna
Date: 2013
Number of Pages: 94
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 06 Feb 2014 15:48
Last Modified: 22 Sep 2014 11:03
URI: http://digre.pmf.unizg.hr/id/eprint/338

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