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Microtubule and actin filament organization during stomatal morphogenesis in the fernAsplenium nidus

The newly-formed guard cell mother cells (GMCs) ofAsplenium nidus are small, lens-shaped and are formed by one or two asymmetrical divisions. Their growth axis is parallel to the plane of their future division, a process during which the internal periclinal wall (IPW) is detached from the partner wall of the underlying cell(s). This oriented GMC expansion occurs transversely to a microfibril bundle, which is deposited externally to a U-like microtubule (Mt) bundle and a co-localized actin filament (Af) bundle. They line the IPW and the major part of the anticlinal walls. The deposition of the microfibril bundle is followed by the slight constriction of the internal part of the GMCs and the broadening of the substomatal cavity. The IPW forms a distinct bulging distal to the neighbouring leaf margin, as well as a less defined proximal one. During the IPW bulging, the Mts and Afs under the external periclinal wall (EPW) attain a radial organization. This is followed by thinning of the central EPW region, which becomes impregnated with a callose-like glucan. The rest of the EPW becomes unequally thickened. The disintegration of the U-like Mt bundle is succeeded by the organization of radial Mt and Af arrays under the IPW. The radial Mt systems, controlling the alignment of the newly-deposited microfibrils, allow the GMC to assume a round paradermal profile. The GMCs form a preprophase Mt band (PPB) perpendicular to the interphase U-like Mt bundle. The anticlinal PPB portions appear first and those lining the periclinal walls later. The cytoplasm adjacent to the latter walls retain the radial Mt systems during early preprophase, simultaneously with the anticlinal PPB portions. The observations suggest that the GMCs of the fernA. nidus obtain a unique form, as a result of a particular polarity established in the cortical cytoplasm of the periclinal walls, in which Mts and Afs appear involved. This polarity persists in cell division and is “inherited” to guard cells (GCs). It provides primary morphogenetic information not only to GMCs but also to GCs.

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Af:

actin filament

EPW:

external periclinal wall

GC:

guard cell

GMC:

guard cell mother cell

IPW:

internal periclinal wall

Mt:

microtubule

MTOC:

microtubule organizing centre

PPB:

preprophase microtubule band

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1. Institute of General Botany, University of Athens, GR-15781, Athens, Greece

   P. Apostolakos, E. Panteris & B. Galatis

1. P. Apostolakos
2. E. Panteris
3. B. Galatis

Apostolakos, P., Panteris, E. & Galatis, B. Microtubule and actin filament organization during stomatal morphogenesis in the fernAsplenium nidus . Protoplasma 198, 93–106 (1997). https://doi.org/10.1007/BF01282135

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• Received: 08 October 1996

• Accepted: 12 February 1997

• Issue Date: March 1997

• DOI: https://doi.org/10.1007/BF01282135

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