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A new technique for monoconidial culture of the most aggressive isolate in a given population of Bipolaris sorokiniana, cause of foliar spot blotch in wheat and barley

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Abstract

We developed a new technique for monoconidial culture of the most aggressive isolate in a given population of Bipolaris sorokiniana, to facilitate the evaluation of spot blotch resistance in wheat and barley. Blotched portions of infected barley leaves were placed on a glass slide in a moist chamber for production of conidia by associated fungal hyphae. Conidia were collected separately and grown on water agar discs. Individual water agar discs having conidium growth were inoculated on barley leaves. The conidium producing the earliest symptom with the largest lesion was considered most aggressive. This lesion was incubated in a moist chamber and the conidial offspring were tested for pathogenicity. When a uniform infection was observed, a small piece of the lesion was cut using a sterilized scalpel, surface sterilized with NaOCl, and inoculated in the centre of Petri dishes containing potato dextrose agar medium. The inoculated Petri dishes were incubated at 25 ± 1 °C to yield monoconidial cultures of the most aggressive isolate. Variability in symptom expression caused by the most aggressive isolate of a given population was much less than variability in symptom expression caused by all isolates collectively. The techniques will be useful for plant pathologists and breeders in screening for spot blotch resistance in wheat and barley.

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Acknowledgements

The authors are thankful to the Indian Council of Agricultural Research, New Delhi, India for financial support. We are also thankful to Mr. R.K. Patel, Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi-221005, India for technical help in microscopic photography. The authors gratefully acknowledge CIMMYT science writer Mike Listman for his editing.

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Authors and Affiliations

  1. Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, 221005, India

    Dharmendra Kumar & Ramesh Chand

  2. Department of Genetics of Plant Breeding, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, 221005, India

    Lal C. Prasad & Arun K. Joshi

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  1. Dharmendra Kumar
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  2. Ramesh Chand
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  3. Lal C. Prasad
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  4. Arun K. Joshi
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Correspondence to Dharmendra Kumar.

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Kumar, D., Chand, R., Prasad, L.C. et al. A new technique for monoconidial culture of the most aggressive isolate in a given population of Bipolaris sorokiniana, cause of foliar spot blotch in wheat and barley. World J Microbiol Biotechnol 23, 1647–1651 (2007). https://doi.org/10.1007/s11274-007-9410-y

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