Ultrastructural evidence for a dual function of the phloem and programmed cell death in the floral nectary of Digitalis purpurea.

@article{Gaffal2007UltrastructuralEF,
  title={Ultrastructural evidence for a dual function of the phloem and programmed cell death in the floral nectary of Digitalis purpurea.},
  author={Karl Peter Gaffal and Gudrun Johanna Friedrichs and Stefan el-Gammal},
  journal={Annals of botany},
  year={2007},
  volume={99 4},
  pages={
          593-607
        }
}
BACKGROUND AND AIMS The floral nectary of Digitalis purpurea is a transitory organ with stomatal exudation of nectar. In this type of nectary, the nectar is thought to be transported to the exterior via intercellular ducts that traverse the nectariferous tissue. The latter is also traversed by a ramified system of phloem strands from which prenectar sugar is most probably unloaded. The aims of this study were to provide some of the basic information needed to evaluate the possible mechanism… CONTINUE READING

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