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Transfer cell induction in cotyledons ofVicia faba L.

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Summary

Immediately prior to seed fill, a dermal transfer cell complex, comprised of epidermal and subepidermal cells, differentiates on the abaxial surface of the cotyledons in seed ofVicia faba. Over the period of differentiation of this complex in vivo, the principal sugars of the seed apoplasmic sap change from hexoses, glucose and fructose, to sucrose. Cotyledons were removed from seeds before differentiation of the transfer cell complex and cultured for 6 days on an agar-based medium in the dark with their abaxial surface in contact with a medium containing either 100 mM hexoses (glucose and fructose in equimolar concentrations) or 100 mM sucrose. On both media, cotyledon growth rate was maintained throughout the culture period at, or above, that of in vivo grown cotyledons of equivalent developmental age. When cotyledons were cultured on a medium containing glucose and fructose, epidermal cells of both the ab- and adaxial surfaces developed wall ingrowths on their outer periclinal walls and their cytoplasm became dense, vesicular, and rich in mitochondria. Extensive ingrowth deposition also occurred on walls of the subepidermal cells and several rows of underlying storage cells where they abutted intercellular spaces. This latter ingrowth development was apparent on both cotyledon surfaces, but extended into more of the underlying cell layers on the abaxial surface at the funicular end of the cotyledon. In in vivo grown cotyledons, such ingrowth development is restricted to the subepidermal cells of the abaxial surface. Ingrowth morphology was commensurate with that of transfer cells of in vivo grown cotyledons. In contrast to the observed induction on a medium containing glucose and fructose, cotyledons cultured with sucrose as the sole sugar source exhibited no ingrowth deposition or small wall ingrowths in some abaxial epidermal cells. While the potential sugar signalling mechanism is unknown, this culture system offers an exciting opportunity to explore the molecular biology of transfer cell development.

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Abbreviations

DAA:

days after anthesis

GC-MS:

gas chromatography and mass spectrometry

PAR:

photosynthetically active radiation

RGR:

relative growth rate

SCM:

standard culture medium

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Authors and Affiliations

  1. Department of Biological Sciences, The University of Newcastle, 2308, Newcastle, NSW, Australia

    C. E. Offler, E. Liet & E. G. Sutton

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  1. C. E. Offler
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  2. E. Liet
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  3. E. G. Sutton
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Correspondence to C. E. Offler.

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Offler, C.E., Liet, E. & Sutton, E.G. Transfer cell induction in cotyledons ofVicia faba L.. Protoplasma 200, 51–64 (1997). https://doi.org/10.1007/BF01280734

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