Genetic resistance and tumour morphology in birch infected with Taphrina betulina

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Christita , M & Overmyer , K 2021 , ' Genetic resistance and tumour morphology in birch infected with Taphrina betulina ' , Forest pathology , vol. 51 , no. 4 , 12709 . https://doi.org/10.1111/efp.12709

Title: Genetic resistance and tumour morphology in birch infected with Taphrina betulina
Author: Christita, Margaretta; Overmyer, Kirk
Contributor: University of Helsinki, Organismal and Evolutionary Biology Research Programme
University of Helsinki, Organismal and Evolutionary Biology Research Programme
Date: 2021-08
Language: eng
Number of pages: 8
Belongs to series: Forest pathology
ISSN: 1437-4781
URI: http://hdl.handle.net/10138/333321
Abstract: Witches' broom of birch (Betula spp.) caused by Taphrina betulina is an understudied disease that causes the formation of woody tumours, from which ectopic axillary buds and branches grow to form a broom-like structure. We have addressed two aspects of this disease using naturally infected mature trees in the field. Broom symptoms offer a convenient means of scoring susceptibility in the field. Variation in broom symptom presentation suggests possible variation in resistance against witches' broom disease. We tracked the local distribution of susceptible individuals among 721 trees at 159 independent sites. The analysis supports the hypothesis that there was genetic resistance segregating in these birch populations. Anatomical changes in broom symptom bearing branches of European silver birch (Betula pendula) were also addressed by comparing sections of tissues from three locations in the same branch, which were normal, swollen in infected tissue adjacent to a tumour, and inside a tumour. Examination of tumours revealed disorganized and swollen xylem, expanded secondary phloem and expanded periderm. Swollen tissues newly infected from spreading disease adjacent to tumours exhibited enhanced growth only in secondary phloem and the periderm, which also exhibited distortions. This finding suggests that tumour formation and possibly pathogen colonization may initiate in these tissues.
Subject: Betula pendula
birch
disease symptoms
genetic resistance
Taphrina betulina
tumour growth
tumours
witches' broom disease
4112 Forestry
11831 Plant biology
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