Phloem loading in the sucrose-export-defective (SXD-1) mutant maize is limited by callose deposition at plasmodesmata in bundle sheath-vascular parenchyma interface

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. ISSN 0033-183X

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Official URL: http://www.springerlink.com/content/166m11w8140508...

Abstract

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.

Item Type:Article
Additional Information:The original publication is available at www.springerlink.com
Uncontrolled Keywords:Callose; Lucifer yellow; Plasmodesma; Phloem loading; Sucrose-export-defective mutant; Zea mays
Subjects:Y Unknown > Subjects to be assigned
Divisions:Support Units > Electron Microscope Unit
Faculty > Faculty of Science > Botany
ID Code:506
Deposited By: Ms Vivien Botha
Deposited On:09 Jan 2007
Last Modified:06 Jan 2012 16:18
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