Plant microtubule studies: past and present |
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Authors: | Yoshinobu Mineyuki |
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Institution: | (1) Department of Life Science, Graduate School of Life Science, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan |
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Abstract: | Here, I briefly review historical and morphological aspects of plant microtubule studies in land plants. Microtubules are
formed from tubulins, and the polymeric configurations appear as singlet, doublet, and triplet microtubules. Doublet microtubules
occur in the axoneme of cilia and flagella, and triplet microtubules occur in the basal bodies and centrosomes. Doublet and
triplet microtubules are lost in all angiosperms and some gymnosperms that do not possess flagellated sperm. In land plants
with flagellated sperm, centriolar centrosomes transform into basal bodies during spermatogenesis. In flowering plants, however,
most male gametes (sperm) are conveyed to eggs without the benefit of cilia or flagella; thus, higher plants lack centriolar
centrosome and doublet and triplet microtubules. The loss of centriolar centrosomes from the life cycle of flowering plants
may have influenced the evolution of the plant microtubule system. Comparison of mitotic apparatuses in basal land plants
and flowering plants illuminates the evolutionary transition from the centriolar microtubule system to the acentriolar microtubule
system. |
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Keywords: | Cilia and flagella Plant microtubule organizing center Prerpophase band Radial microtubule system Spindle |
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