- Title
- Phloem loading in the sucrose-export-defective (SXD-1) mutant maize is limited by callose deposition at plasmodesmata in bundle sheath-vascular parenchyma interface
- Creator
- Botha, Christiaan E J, Cross, Robin H M, Van Bel, A J E, Peter, Craig I
- Date
- 2000
- Type
- Article
- Identifier
- vital:6503
- Identifier
- http://hdl.handle.net/10962/d1005926
- Description
- Using Lucifer Yellow we have demonstrated that the phloem-loading pathway from the mesophyll to the bundle sheath-vascular parenchyma interface in Zea mays source leaves follows a symplasmic route in small and intermediate vascular bundles in control as well as in the green sections of mutant sucrose-export-defective (SXD-1) plants. In the anthocyanin-rich mutant leaf sections, Lucifer Yellow transport was prohibited along the same path, at the bundle sheath-vascular parenchyma interface in particular. Plasmodesmata at the latter interface in SXD-1 anthocyanin-rich leaf sections appear to be structurally altered through callose deposition at the plasmodesmal orifices. We suggest that a transport bottleneck at the bundle sheath-vascular parenchyma interface is thus orchestrated and regulated through callose formation, preventing symplasmic transport across this important loading interface.
- Format
- 11 pages
- Language
- English
- Relation
- Botha, C.E.J. and Cross, R.H.M. and van Bel, A.J.E. and Peter, C.I. (2000) Phloem loading in the sucrose-export-defective (SXD-1) mutant maize is limited by callose deposition at plasmodesmata in bundle sheath-vascular parenchyma interface. Protoplasma, 214 . pp. 65-72. Available: http://link.springer.com/article/10.1007/BF02524263
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Botha, Christiaan Edward Johannes (Prof)
Cross, Robin H M (Prof)
Peter, Craig (Assoc Prof)
RU Department of Botany
SDG 15. Life On Land
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