Allelic Tests and Sequence Analysis of Three Genes for Resistance to Xanthomonas perforans Race T3 in Tomato Allelic Tests and Sequence Analysis of Three Genes for Resistance to Xanthomonas perforans Race T3 in Tomato Recent Advances on Genetics and Mapping of Resistance to Bacterial Spot in Tomato Recent Advances on Genetics and Mapping of Resistance to Bacterial Spot in Tomato