Document Detail

Phenylpropanoid Pathway is Potentiated by Silicon in the Roots of Banana Plants During the Infection Process of Fusarium oxysporum f.sp. cubense.
MedLine Citation:
PMID:  24350769     Owner:  NLM     Status:  Publisher    
Fusarium wilt, caused by Fusarium oxysporum f.sp. cubense (Foc), is one of the diseases that causes the greatest reductions in banana yield worldwide. This study investigated, at the histochemical level, whether silicon (Si) could enhance the production of phenolics on the roots of banana plants in response to infection by Foc. Plants from the cultivar Maçã (which is susceptible to Foc) were grown in plastic pots amended with 0 (-Si) or 0.39 g of Si (+Si) per kg of soil and inoculated with the race 1 of Foc. The root Si concentration was increased by 35.6% for +Si plants in comparison to the -Si plants, which contributed to a 27% reduction in Fusarium wilt symptoms on roots. On the root sections of the +Si plants treated with Neu's reagent, strong yellow-orange fluorescence was observed in the phloem, and lemon-yellow fluorescence was observed in the sclerenchyma and metaxylem vessels, indicating the presence of flavonoids. On the root sections of the +Si plants treated with Wilson's reagent, orange-yellowish autofluorescence was more pronounced around the phloem vessels, and yellow fluorescence was more pronounced around the metaxylem vessels, also indicating the presence of flavonoids. There was an absence of fluorescence on the root sections of the -Si plants treated with these reagents. Lignin was more densely deposited on the cortex of the roots of the +Si plants. Dopamine was barely detected in the roots of the -Si plants, but was heavily deposited on the phloem and metaxylem vessels of the roots of the +Si plants, as confirmed by the intense orange-yellowish fluorescence. The present study provides new evidence of the pivotal role of the phenylpropanoid pathway in the resistance of banana plants to Foc infection when supplied with Si.
Alessandro A Fortunato; Washington Luis da Silva; Fabricio Rodrigues
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-12-18
Journal Detail:
Title:  Phytopathology     Volume:  -     ISSN:  0031-949X     ISO Abbreviation:  Phytopathology     Publication Date:  2013 Dec 
Date Detail:
Created Date:  2013-12-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9427222     Medline TA:  Phytopathology     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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