Journal
PHYSIOLOGIA PLANTARUM
Volume 123, Issue 3, Pages 339-347Publisher
WILEY
DOI: 10.1111/j.1399-3054.2005.00463.x
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The pectin content in the meristem of Sinapis alba at flowering transition was assessed in electron microscopy using immunocytochemistry and the monoclonal antibody 2F4 that recognizes a Ca2+-induced supramolecular conformation of homogalacturonans (Liners et al. Plant Physiol 91: 1419-1424, 1989; Liners et al. Plant Physiol 99: 1099-1104, 1992). The meristem's pectins were not recognized at all by the 2F4 monoclonal antibody unless they were enzymatically (PME: pectin methylesterase) or chemically (NaOH) de-esterified, indicating that native pectin must be largely esterified in the apical meristem. A striking but transient decrease of the homopolygalacturonic content of the meristem's cell walls occurred between 20 and 24 h after start of the inductive long day. These changes suggest a role for pectin in floral transition.
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