... AccessLocalization of DIR1 at the tissue, cellular and subcellular levels during Systemic Acquired Resistance in Arabidopsis using DIR1: GUS and DIR1: EGFP reportersMarc J Champigny1,4, Heather Shearer1,4, ... article as: Champigny et al.: Localization of DIR1 at the tissue, cellular and subcellular levels during Systemic Acquired Resistance in Arabidopsis using DIR1: GUS and DIR1: EGFP reporters. BMC Plant ... GUS or a DIR1- GUS fusion in Ws and dir1- 1, respectively. Examina-tion of these lines indicated that the DIR1 promoterregion initiated expression of GUS and DIR1: GUS in seedlings, roots and floral...