Identification of a potential structural marker for embryogenic competency in the Brassica napus spp. oleifera embryogenic tissue

Plant Cell Reports - Tập 25 Số 9 - Trang 887-895 - 2006
Namasivayam, Parameswari1, Skepper, Jeremy2, Hanke, David3
1Department of Cell and Molecular Biology, Faculty of Biotechnology and Biomolecular Sciences, University Putra Malaysia, Selangor, Malaysia
2Multi Imaging Centre, Department of Anatomy, University of Cambridge, Cambridge CB2 3EA, UK
3Department of Plant Sciences, University of Cambridge, Cambridge, CB2 3EA, UK

Tóm tắt

The Brassica napus secondary embryogenesis system requires no exogenous growth regulator to stimulate embryo development. It is stable embryogenically over a long period of culture and has a distinct pre-embryogenic stage. This system was used to investigate the morphological and cellular changes occurring in the embryogenic tissue compared to non-embryogenic tissue using various microscopy techniques. A unique ultrastructural feature designated the extracellular matrix (ECM) was observed on the surface of pre-embryogenic embryoids but not on the non-embryogenic individuals. The ECM layer was found to be dominant in the pre-embryogenic stage and reduced to fragments during embryo growth and development in mature embryogenic tissue. This is a novel aspect of the phenotype previously unreported in the Brassica system. This structure might be linked to acquisition of embryogenic competence.

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