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Ultrastructural and biochemical aspects of cell wall reconstitution in recalcitrant (grapevine) and regenerating (tobacco) leaf protoplasts

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Summary

To identify possible reasons that may contribute to recalcitrance in plant protoplasts, the time course of new cell wall deposition was studied by scanning electron microscopy in protoplasts of a recalcitrant species, the grapevine. Results showed that microfibrils were developed after 2 days of culture, that complete cell wall formation occurred on Day 6 to 7 of protoplast culture, and its ultrastructural appearance was identical to that of grapevine leaf-derived callus cells. In addition, a comparative study was undertaken on [U-14C]glucose uptake and incorporation in ethanol-soluble, cellulosic, and noncellulosic polysaccharide fractions in protoplasts of grapevine and of a readily regenerating species, tobacco, during culture. There was a significantly higher [U-14C]glucose uptake by tobacco than by grapevine protoplasts. The label distribution in the ethanol-soluble, cellulosic, and noncellulosic fractions of newly synthesized cell walls differed quantitatively between the two species. In particular, the labeled glucose incorporated in the noncellulosic cell wall fraction was threefold greater in tobacco than in grapevine protoplasts. Differences were also revealed in the monosaccharide composition of this fraction between the two species. Addition of dimethyl sulfoxide to the culture medium resulted in a dramatic increase in [U-14C]glucose uptake by grapevine protoplasts, whereas it exhibited a limited effect in tobacco protoplasts. It showed no effect on the ultrastructural characteristics of new cell wall nor on the incorporation rate of labeled glucose in the cellulosic and noncellulosic cell wall fractions.

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Katsirdakis, K.C., Roubelakis-Angelakis, K.A. Ultrastructural and biochemical aspects of cell wall reconstitution in recalcitrant (grapevine) and regenerating (tobacco) leaf protoplasts. In Vitro Cell Dev Biol –Plant 28, 90–96 (1992). https://doi.org/10.1007/BF02823025

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  • DOI: https://doi.org/10.1007/BF02823025

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