Abstract
The extended bundle sheath (EBS) is a specialized layer of cells that enhances the lateral transport of photoassimilates within the leaf. This little-known tissue is often considered to be legume-specific. We identified an EBS in cotyledons and leaves of the non-legume Ricinus communis L. By means of cytological and immunological studies and using the localization of the iron-chelator nicotianamine as an established indicator for mass transport, we confirmed its role as a transport tissue and a temporal sink. Observations on cotyledons of Ricinus seedlings further proved that the EBS carries out these tasks from a very early stage of development onwards. This is the first time that information has been obtained on the physiological role of an EBS in a non-legume. Our results support the idea of its widespread occurrence among higher plants.
Abbreviations
- EBS:
-
extended bundle sheath
- NA:
-
nicotianamine
- PVM:
-
paraveinal mesophyll
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Acknowledgement
The authors gratefully acknowledge Dr. R. Manteuffel (IPK Gatersleben, Germany) for kindly providing the antibody against nicotianamine and for helpful discussions.
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Rutten, T., Krüger, C., Melzer, M. et al. Discovery of an extended bundle sheath in Ricinus communis L. and its role as a temporal storage compartment for the iron chelator nicotianamine. Planta 217, 400–406 (2003). https://doi.org/10.1007/s00425-003-1010-y
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DOI: https://doi.org/10.1007/s00425-003-1010-y