Abstract
The arrangements of cortical microtubules (MTs) and of cellulose microfibrils in the median longitudinal cryosections of the vegetative shoot apex of Vinca major L., were examined by immunofluorescence microscopy and polarizing microscopy, respectively. The arrangement of MTs was different in the various regions of the apex: the MTs tended to be arranged anticlinally in tunica cells, randomly in corpus cells, and transversely in cells of the rib meristem. However, in the inner layers of the tunica in the flank region of the apex, cells with periclinal, oblique or random arrangements of MTs were also observed. In leaf primordia, MTs were arranged anticlinally in cells of the superficial layers and almost randomly in the inner cells. Polarizing microscopy of cell walls showed that the arrangement of cellulose microfibrils was anticlinal in tunica cells, random in corpus cells, and transverse in cells of the rib meristem; thus, the patterns of arrangement of microfibrils were the same as those of MTs in the respective regions. These results indicate that the different patterns of arrangement of MTs and microfibrils result in specific patterns of expansion in the three regions. These differences may be necessary to maintain the organization of the tissues in the shoot apex.
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Abbreviations
- MT(s):
-
microtubule(s)
- lp:
-
length of the youngest leaf primordium
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Sakaguchi, S., Hogetsu, T. & Hara, N. Arrangement of cortical microtubules in the shoot apex of Vinca major L.. Planta 175, 403–411 (1988). https://doi.org/10.1007/BF00396347
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DOI: https://doi.org/10.1007/BF00396347