Influence of seed-borne Cochliobolus sativus (Anamorph Bipolaris sorokiniana) on crown rot and root rot of barley and wheat

Abdullah Mohammed Al-Sadi, Michael Leonard Deadman

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The effect of seed-borne pathogens of wheat and barley on crown and root rot diseases of seven barley cultivars (Jimah-6, Jimah-51, Jimah-54, Jimah-58, Omani, Beecher and Duraqi) and three wheat cultivars (Cooley, Maissani and Shawarir) was investigated. Bipolaris sorokiniana and Alternaria alternata were detected in seeds of at least eight cultivars, but Fusarium species in seeds of only two barley cultivars (Jimah-54 and Jimah-58). Crown rot and root rot symptoms developed on barley and wheat cultivars following germination of infected seeds in sterilized growing media. Bipolaris sorokiniana was the only pathogen consistently isolated from crowns and roots of the emerging seedlings. In addition, crown rot and root rot diseases of non-inoculated barley cultivars correlated significantly with B. sorokiniana inoculum in seeds (P = 0.0019), but not with Fusarium or Alternaria (P. > 0.05). These results indicate the role of seed-borne inoculum of B. sorokiniana in development of crown rot and root rot diseases. Pathogenicity tests of B. sorokiniana isolates confirmed its role in inducing crown rot and root rot, with two wheat cultivars being more resistant to crown and root rots than most barley cultivars (P. <0.05). Barley cultivars also exhibited significant differences in resistance to crown rot (P. <0.05). In addition, black point disease symptoms were observed on seeds of three barley cultivars and were found to significantly affect seed germination and growth of some of these cultivars. This study confirms the role of seed-borne inoculum of B. sorokiniana in crown and root rots of wheat and barley and is the first report in Oman of the association of B. sorokiniana with black point disease of barley.

Original languageEnglish
Pages (from-to)683-690
Number of pages8
JournalJournal of Phytopathology
Volume158
Issue number10
DOIs
Publication statusPublished - Oct 2010

Keywords

  • Helminthosporium
  • Hordeum vulgare
  • ITS rDNA
  • Morphology
  • Oman
  • Triticum aestivum

ASJC Scopus subject areas

  • Plant Science
  • Agronomy and Crop Science
  • Physiology
  • Genetics

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