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Updated: May 12, 2026

Live Imaging of Arabidopsis Pollen Tube Reception and Double Fertilization Using the Semi-In Vitro Cum Septum Method
Published on: February 24, 2023
An unconventional road for the secretion of transglutaminase in pollen tubes?
Stefano Del Duca1, Donatella Serafini-Fracassini, Giampiero Cai
1Dipartimento di Scienze Biologiche Geologiche e Ambientali (BiGeA); Università degli Studi di Bologna; Bologna, Italy.
Abstract:
The transglutaminase (TGase) is present in the pollen tube where it most likely participates in the regulation of different activities including the organization of cytoskeletal elements (microtubules and actin filaments). In addition to a cytosolic form of TGase, new data suggest the existence of TGase forms associated with the internal membranes and with the cell wall of pollen tubes. This different localization extends the functional range of pollen TGase but also raises the question how TGase can be precisely (and in harmony with the pollen tube growth) redistributed in different cellular compartments. The discovery that TGase exists as different isoforms may suggest a pathway to achieve this result.
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