| Histopathology of Sclerotinia sclerotiorum attack on flower parts of Helianthus annuus heads in tolerant and susceptible varieties. | |
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MedLine Citation:
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PMID: 15180158 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Sunflower head rot is a major disease caused by Sclerotinia sclerotiorum. Sunflower varieties which are tolerant to the fungus have been developed. The changes occurring in flower parts at different times after inoculation with pathogen ascospores were studied for two sunflower varieties (tolerant HA 302 and susceptible HA 89). In variety HA 302 there was cell collapse, changes in cell wall composition, and an increase in phenolic compounds in the tissues of corolla and style, which prevented the pathogen from advancing. This response was weaker in susceptible variety HA 89, and occurred only in the style, so did not stop the pathogen from developing and reaching the ovary. Phenolic compounds were found in HA 302 corolla and style tissues only when the pathogen was present, constituted an induced response that prevented further development of the fungus. Principal component analysis (PCA) showed that at the beginning of the infection there was no difference in behavior between the two varieties. The difference arose during the final observation times, when in variety HA 89, the pathogen colonized ovary, style and base of filaments and produced noticeable colonization of the corolla. |
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Authors:
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M A Rodríguez; N Venedikian; M E Bazzalo; A Godeas |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Mycopathologia Volume: 157 ISSN: 0301-486X ISO Abbreviation: Mycopathologia Publication Date: 2004 Apr |
Date Detail:
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Created Date: 2004-06-07 Completed Date: 2004-07-29 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7505689 Medline TA: Mycopathologia Country: Netherlands |
Other Details:
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Languages: eng Pagination: 291-302 Citation Subset: IM |
Affiliation:
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Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina. arodrig@bg.fcen.uba.ar |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Argentina Ascomycota / growth & development* Flowers / microbiology*, ultrastructure Genetic Predisposition to Disease Helianthus / microbiology*, ultrastructure Histocytochemistry Phenazines / chemistry Plant Diseases / microbiology* Principal Component Analysis Random Allocation |
| Chemical | |
Reg. No./Substance:
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0/Phenazines; 477-73-6/safranine T |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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