Student Publications

Chemotropic and contact responses of Phytophthora sojae hyphae to soybean isoflavonoids and artificial substrates

Document Type

Article

Abstract

We have investigated the role of the isoflavoncs daidzein and genistein on the chemotropic behavior of germinating cysts of Phytophthora sojae. Hyphal germlings were shown to respond chemotropically to daidzein and genistein, suggesting that hyphal tips from zoospores that have encysted adjacent to the root may use specific host isoflavones to locate their host. Observations of the contact response of hyphal germlings were made on several different substrates in the presence and absence of isoflavoncs. Hyphal tips of germlings detected and penetrated pores in membranes and produced multiple appressoria on smooth, impenetrable surfaces. Hyphae that successfully penetrated the synthetic membrane were observed to grow away from the membrane surface. The presence of isoflavones in the medium surrounding the hyphal germlings did not appear to alter any of those habits. Daidzein and genistein did not inhibit germination or initial hyphal growth at concentrations up to 20 μM.

Publication Title

Plant Physiology

Publication Date

1998

Volume

117

Issue

4

First Page

1178

Last Page

1998

ISSN

0032-0889

DOI

10.1104/pp.117.4.1171

Keywords

Oomycetes, infectious Agent, plant Diseases

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