Pre prophase micro tubule band and local wall thickening in guard cell mother cells of some leguminosae

Galatis, B.; Apostolakos, P.; Katsaros, C.; Loukari, H.

Annals of Botany (London) 50(6): 779-792


ISSN/ISBN: 0305-7364
Accession: 006161368

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An examination of leaf protodermal cells from 20 spp. belonging to the family Leguminosae revealed the organization of pre-prophase microtubule bands (PMB), and that the regions of the anticlinal walls of the guard cell mother cells (GMC) lined by the PMB become detectably thickened. These local thickenings are deposited during the presence of pre-prophase microtubules which persist up to late prophase. During deposition of the thickenings the GMC exhibit a significant dictyosome and endoplasmic reticulum (ER) activity. Smooth as well as coated dictyosome vesicles seem to fuse preferentially with the plasmalemma of the PMB cortical zone. The cell plate of the symmetrical division of the GMC meets the parental walls at the middle of the thickenings with surprising accuracy. It intersects the middle of the cortical cytoplasmic region traversed previously by the PMB. The deposition of the local wall thickenings in the cortical site of the plane of the future cytokinesis in GMC must be a general feature of the Leguminosae. In these plants the guard cell wall differentiation commences in GMC. The PMB is a cytoplasmic structure appearing extensively in vegetative cells of higher plants. [The following species of the family Leguminosae were examined: Lotoideae: Phaseolus vulgaris L., Trifolium alexandrinum L., Medicago arborea L., M. orbicularis All., M. polymorpha L., M. rugosa Derr., Calycotome villosa Link., Vicia faba L., V. sativa L., Pisum sativum L., Cicer arietinum L., Spartium junceum L., Robinia pseudoacacia L., Melilotus indica All., Coronilla emeroides Boiss; Caesalpinioideae: Ceratonia siliqua L., Cercis siliquastrum L.; Mimosoideae: Acacia cyanophylla Lindl., A. catechu Willd., A. berlandieri Benth in Hook.].