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Science 16 September 2005:
Vol. 309. no. 5742, p. 1828
DOI: 10.1126/science.1114756
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Brevia

Characterization of a Phytophthora Mating Hormone

Jianhua Qi, Tomoyo Asano, Masashi Jinno, Kouhei Matsui, Keisuke Atsumi, Youji Sakagami and Makoto Ojika*

Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan.


Fig. 1. (A) The chemical structure of hormone {alpha}1 isolated from the A1 mating type of P. nicotianae. (B) The dose-dependent increase of sexual spore (oospore) formation in the A2 mating types of P. nicotianae and other species (P. capsici, P. cambivora, and P. infestans) on treatment with hormone {alpha}1. We counted the total number of oospores (vertical axis) that were produced around an {alpha}1-containing paper disk. EA represents an ethyl acetate extract corresponding to 8 ml of culture broth; C is the control. Values are means of four replicates ± SE. (C) Photomicrograph of oospores induced on the P. nicotianae A2 mating type by hormone {alpha}1 at a dose of 100 ng. They are fertilized structures resulting from oogonia (female, o) and antheridia (male, a). Scale bar, 50 µm. [View Larger Version of this Image (46K GIF file)]
 

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Science. ISSN 0036-8075 (print), 1095-9203 (online)