Differential Response to Floral Infection by Botrytis cinerea within the Genus Pelargonium

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  • 1 Department of Horticulture, The Pennsylvania State University, University Park, PA 16802-4200
  • 2 Department of Horticulture, The Pennsylvania State University, University Park, PA 16802-4200
  • 3 Department of Horticulture, The Pennsylvania State University, University Park, PA 16802-4200

The objective of this study was to identify geranium cultivars that exhibit differential reactions to floral inoculation with Botrytis cinerea Per. ex. Fr. Sixty-two genotypes, including both cultivars and breeding lines, were evaluated from several Pelargonium species. Resistant genotypes included the diploid Pelargonium peltatum (L.) L'Herit. cultivar King of Balcon and the diploid Pelargonium ×hortorum L.H. Bail. cultivar Ben Franklin, as well as the diploid Pelargonium peltatum accession 93-1-33 developed from an accession obtained from South Africa. Susceptible genotypes included the putative tetraploid Pelargonium peltatum cultivar Simone. Floral resistance was not correlated with foliar resistance. Diploid genotypes appeared to have greater resistance than tetraploid genotypes, and P. peltatum cultivars more resistance than P. ×hortorum cultivars. In addition, the association of petal number and resistance was investigated.

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