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Phytopathogenic Mollicutes
Year : 2019, Volume : 9, Issue : 1
First page : ( 161) Last page : ( 162)
Print ISSN : 2249-4669. Online ISSN : 2249-4677.
Article DOI : 10.5958/2249-4677.2019.00081.1

Evaluation of pomological traits of pear decline-resistant rootstocks

Jarausch Wolfgang1,*, Henkel Georg2, Schneider Bernd3,4, Seemüller Erich3

1AlPlanta, RLP AgroScience, Neustadt an der Weinstraße, Germany

2Landwirtschaftskammer Schleswig-Holstein, Ellerhoop, Germany

3Julius Kühn-Institut, Dossenheim, Germany

4Thünen-Institut für Forstgenetik, Waldsieversdorf, Germany

*Corresponding author e-mail: Wolfgang Jarausch (wolfgang.jarausch@agroscience.rlp.de)

Online published on 25 July, 2019.


Twenty pear rootstock genotypes were examined for their pear decline resistance and their pomological traits in a six years field trial. All rootstock selections were grafted with the susceptible cultivar Williams followed by graft-inoculation with a severe strain of ‘Candidatus Phytoplasma pyri’ prior plantation. Seven years post inoculation all surviving trees were positive in PCR analyses. The concentration of the phytoplasmas was determined by quantitative PCR and ranged from 3x106 to 6x107 phytoplasma cells per gram of phloem tissue. Among the grafted rootstock genotypes clear differences in mortality, symptom expression and pomological performance were observed. Pear decline-tolerant rootstocks with promising pomological traits were selected for further evaluation.



‘Candidatus Phytoplasma pyri’, Pyrus, resistance screening, phytoplasma quantification.


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