Bibliographical noteFunding Information:
Research activities of JG are supported by grants from the National Science Foundation Arabidopsis 2010 program (IOS - 0419648) and the Department of Energy Biosciences program (DE-FG02-05ER15670). Research of JT is supported by a personal VENI grant from NWO, the Dutch Organization for Scientific Research (no. 863.04.019). We also thank Kees van Loon for helpful comments on parts of this manuscript.
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