Abstract:
:Sterol acquisition by soilborne plant pathogens of the genus Phytophthora is presumed to involve extracellular proteins belonging to class-I elicitins. However, little is known about the relationship between sterol availability and elicitin secretion. The objective of this study was to determine the expression of class-I elicitin genes in Phytophthora sojae when grown in a medium containing stigmasterol or cholesterol. P. sojae growth was stimulated by nanomolar concentrations of stigmasterol and cholesterol, which also resulted in the down-regulation of its elicitin genes over time when expression profiles were monitored using real time Reverse Transcription Polymerase Chain Reaction (RT-PCR). The down-regulation of elicitin genes in response to the two sterols also coincided with a reduction in the amount of elicitins detected in spent filtrates. Our study is the first to show the influence of sterols on elicitin gene expression in Phytophthora, which is important with respect to the ecology of elicitin secretion as sterol carrier proteins in the environment.
journal_name
J Chem Ecoljournal_title
Journal of chemical ecologyauthors
Yousef LF,Yousef AF,Mymryk JS,Dick WA,Dick RPdoi
10.1007/s10886-009-9653-1subject
Has Abstractpub_date
2009-07-01 00:00:00pages
824-32issue
7eissn
0098-0331issn
1573-1561journal_volume
35pub_type
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