Summary
Translocation of 14C-labelled photosynthate across 2 cm long carrot calluses was not detectable even 6 hours after a 30 min 14CO2 pulse. This is consistent with the discontinuous nature of the phloem as a whole, although small strands of contiguous, well differentiated sieve cells with companion cells were readily seen in electron micrographs.
References
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With the technical collaboration of H. J. W. Edge. Botany Dept. Kings College, London.
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Hanson, A.D., Edelman, J. Phloem in carrot calluses. Planta 93, 171–174 (1970). https://doi.org/10.1007/BF00387124
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DOI: https://doi.org/10.1007/BF00387124