Abscisic acid is a substrate of the ABC transporter encoded by the durable wheat disease resistance gene Lr34

We are grateful to Professor Yutaka Sato from the NARO Hokkaido Agricultural Research Center, Japan, for providing seeds of the OsABA8ox1 overexpressing line 27-3. We would also like to thank Professor Kazuo Shinozaki from the Riken Center for Sustainable Resource Science for providing valuable comments on the manuscript, Gabriele Buchmann for producing the p6Uyeast vector, Dr Tina Jordan for producing the Lr34 yeast cDNA constructs, Sabine Sommerfeld for excellent technical assistance with the barley transformations, and Professor Anne C. Roulin for assistance with statistical analyses. This work was supported by an Advanced Investigator grant from the European Research Council (ERC-2009-AdG 249996, Durable resistance) and by the Swiss National Science Foundation grant 310030_163260. SGK and JK received support from an Ambizione fellowship of the Swiss National Science Foundation.