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Ovary colonization by Claviceps africana is related to ergot resistance in male-sterile sorghum lines

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Komolong, B., Chakraborty, S., Ryley, M. and Yates, D. (2003) Ovary colonization by Claviceps africana is related to ergot resistance in male-sterile sorghum lines. Plant Pathology, 52 (5). pp. 620-627. ISSN 0032-0862


Article Link: https://doi.org/10.1046/j.1365-3059.2003.00886.x


Ergot, caused by Claviceps africana, has emerged as a serious threat to sorghum hybrid seed production worldwide. In the absence of gene-for-gene-based qualitative resistance in commercial cultivars, varieties with high pollen production that can escape ergot infection are preferred. Recent demonstration of differences in ergot susceptibility among male-sterile lines has indicated the presence of partial resistance. Using chitin-specific fluorescin-isothiocyanate-conjugated wheat germ agglutin and callose-specific aniline blue, this study investigated the process of sorghum ovary colonization by C. africana. Conidia germinated within 24 h after inoculation (a.i.); the pathogen was established in the ovary by 79 h a.i., and at least half of the ovary was converted into sphacelial tissue by 120 h a.i. Changes in fungal cell wall chitin content and strategic callose deposition in the host tissue were associated with penetration and invasion of the ovary. The rate of ovary colonization differed in three male-sterile lines that also differed in ergot susceptibility. This work demonstrates a possible histological basis for partial resistance in male-sterile sorghum lines that could lay the foundation for variety improvement through further breeding and selection.

Item Type:Article
Subjects:Plant pests and diseases > Individual or types of plants or trees > Sorghum
Plant pests and diseases > Plant pathology
Live Archive:29 Jan 2024 05:42
Last Modified:29 Jan 2024 05:42

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