Updated project metadata. Understanding plant’s response mechanisms against pathogenesis is fundamental for the development of resistant crop varieties and more productive agriculture. In this regard, ‘omic’ approaches are heralded as valuable technologies. In this work, combining iTRAQ technology with mass spectrometry, the proteomes from leaves of Brassica oleracea plants infected with Xanthomonas campestris pv. campestris (Xcc) and control plants at two different post-infection times were compared.