Abstract.
In the course of a study on the early events of cambial derivative differentiation in Populus × euramericana, seasonal changes in the pattern of pectin methylesterase (PME, EC 3.1.1.11) isoforms were followed. During the resting season, cell wall extracts contained mainly alkaline isoforms with an Mr around 55 kDa and optimal pH between 5.6 and 6.0. Neutral isoforms with an Mr around 35 kDa and optimal pH between 6.0 and 6.6 predominated in the extracts during the period of high meristematic activity. In the active cambial initials and in their immediate derivatives, the enzymes were immunolocalized exclusively in the dictyosomes. In older cells, they were present both in dictyosomes and in wall junctions. These results indicate that exportation of neutral PMEs towards the walls might be considered as an early marker of differentiation in cambial derivatives.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 17 May 1996 / Accepted: 5 November 1996
Rights and permissions
About this article
Cite this article
Guglielmino, N., Liberman, M., Catesson, A. et al. Pectin methylesterases from poplar cambium and inner bark: localization, properties and seasonal changes. Planta 202, 70–75 (1997). https://doi.org/10.1007/s004250050104
Issue Date:
DOI: https://doi.org/10.1007/s004250050104