Recommend Plant Signaling & Behavior (PS&B) to your librarian for 2008. Download form here.

Sign up for Table of Contents Alerts!

PS&B is the official journal of the Society for Plant Neurobiology. Full membership ($60 annually) and student membership ($30 annually) include online access to the journal. Click here to join.

Email this page

Print this page

Article Addendum

Signaling from soybean roots to Rhizobium: an ATP-binding cassette-type transporter mediates genistein secretion

Akifumi Sugiyama, Nobukazu Shitan and Kazufumi Yazaki

Purchase article for $19

Subscribe to this journal for $79/year

Legume plants have a unique ability to fix atmospheric nitrogen via symbiosis with rhizobia. For the establishment of symbiosis, legume plants secrete signaling molecules such as flavonoids from root tissues, leading to the attraction of rhizobia and the induction of rhizobial nod genes. Genistein and daidzein are found in soybean root exudates and function as signal molecules in soybean – Bradyrhizobium japonicum chemical communication. Although it is more than 20 years since these signal flavonoids were identified, almost nothing has been characterized concerning the membrane transport process of these molecules from soybean roots. To elucidate the transport mechanism we performed membrane transport assays with plasma membrane-enriched vesicles and various inhibitors. As a result, we concluded that an ATP-binding cassette-type transporter is involved in the secretion of genistein from soybean roots. The possible involvement of a pleiotropic drug resistance-type ABC transporter in this secretion is also discussed.

Authors

Akifumi Sugiyama

Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Japan

Nobukazu Shitan

Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Japan

Kazufumi Yazaki

Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Japan

Purchase article for $19

Subscribe to this journal for $79/year