GUS expression in sweet oranges (Citrus sinensis L. Osbeck) driven by three different phloem-specific promoters - Miyata, Luzia Yuriko; Harakava, Ricardo; Stipp, Liliane Cristina Liborio; Mendes, Beatriz Madalena Januzzi; Appezzato-da-Glória, Beatriz; Mourão Filho, Francisco de Assis Alves (Plant Cell Reports, 2012)