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- W2170892592 endingPage "1921" @default.
- W2170892592 startingPage "1911" @default.
- W2170892592 abstract "Vascular plants have evolved shoot apical meristems (SAMs), whose structures differ among plant groups. To clarify the evolutionary course of the different structural types of SAMs, we compared plasmodesmatal networks in the SAMs for 17 families and 24 species of angiosperms, gymnosperms, and pteridophytes, using transmission electron microscopy (TEM). The plasmodesmata (PD) in almost all cell walls in median longitudinal sections of SAMs were counted, and the PD density per unit area was calculated for each cell wall. Angiosperm and gymnosperm SAMs have low densities, with no difference between stratified (tunica-corpus) and unstratified structures. SAMs of ferns, including Psilotum and Equisetum, have average densities that are more than three times higher than those of seed plants. Interestingly, microphyllous lycopods have both the fern and seed-plant types of PD networks; Selaginellaceae SAMs with single apical cells have high PD densities, while SAMs of Lycopodiaceae and Isoetaceae with plural initial cells have low PD densities, equivalent to those of seed plants. In summary, PD networks are strongly correlated to SAM organizations-SAMs with single and plural initial cells have the fern and seed-plant types of PD, respectively. The two SAM organizations may have evolved separately in lycophytes and euphyllophytes and may be associated with gain or loss of the ability to form secondary PD." @default.
- W2170892592 created "2016-06-24" @default.
- W2170892592 creator A5005263741 @default.
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- W2170892592 date "2007-01-01" @default.
- W2170892592 modified "2023-10-01" @default.
- W2170892592 title "Evolution of shoot apical meristem structures in vascular plants with respect to plasmodesmatal network" @default.
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- W2170892592 doi "https://doi.org/10.3732/ajb.94.12.1911" @default.
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