Resistance against basil downy mildew in Ocimum species

Yariv Ben-Naim, Lidan Falach, Yigal Cohen

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Downy mildew, caused by the oomycete Peronospora belbahrii, is a devastating disease of sweet basil. In this study, 113 accessions of Ocimum species (83 Plant Introduction entries and 30 commercial entries) were tested for resistance against downy mildew at the seedling stage in growth chambers, and during three seasons, in the field. Most entries belonging to O. basilicum were highly susceptible whereas most entries belonging to O. americanum, O. kilimanadascharicum, O. gratissimum, O. campechianum, or O. tenuiflorum were highly resistant at both the seedling stage and the field. Twenty-seven highly resistant individual plants were each crossed with the susceptible sweet basil 'Peri', and the F1 progeny plants were examined for disease resistance. The F1 plants of two crosses were highly resistant, F1 plants of 24 crosses were moderately resistant, and F1 plants of one cross were susceptible, suggesting full, partial, or no dominance of the resistance gene(s), respectively. These data confirm the feasibility of producing downy mildew-resistant cultivars of sweet basil by crossing with wild Ocimum species.

Original languageEnglish
Pages (from-to)778-785
Number of pages8
JournalPhytopathology
Volume105
Issue number6
DOIs
StatePublished - 1 Jun 2015

Bibliographical note

Publisher Copyright:
© 2015 The American Phytopathological Society.

Keywords

  • Herbs
  • Hybrids
  • Spices
  • Wild basils

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