Premise of research. Secondary phloem produced by a bifacial vascular cambium is the distinctive feature of lignophytes, the group that comprises the seed plants and the progymnosperms. Because ...

Phloem diseases, including the economically devastating citrus greening, are particularly difficult to study because phloem cells -- essential for plant nutrient transport -- are difficult to access ...

This is a preview. Log in through your library . Abstract Background and Aims Phloem evolution has been explored in the literature across very broad scales, either for vascular plants as a whole or ...

image: Citrus leaf parenchyma protoplast viewed under different light sources and filters after incubation in Hoechst 3342, Neutral Red, and MitoTracker Green. Each cell was viewed under brightfield ...