, Volume 59 Issue 6
Special issue: Plant vascular biology (2)
Editor: William J. Lucas and Chun-Ming Liu
The cover shows secondary vascular bundles, produced by a unique monocot cambium, in which the phloem is centrally-located, surrounded by a xylem ring (Zinkgraf et al., 436–449). In this issue, first insights into the genetic regulation and evolution of this fascinating meristem are presented in support of the hypothesis that genes regulating this vascular cambia were coopted in the evolution of this novel meristem that is found within some species of the Asparagales.