NDLI: Nuclear centering in Spirogyra: force integration by microfilaments along microtubules

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Nuclear centering in Spirogyra: force integration by microfilaments along microtubules

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Planta : Volume 203

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Planta : Volume 201

Nuclear centering in Spirogyra: force integration by microfilaments along microtubules

Content Provider	Springer Nature Link
Author	Grolig, Franz
Copyright Year	1997
Abstract	The contribution of microtubules and microfilaments to the cytomechanics of transverse nuclear centering were investigated in the charophycean green alga Spirogyracrassa (Zygnematales). Cytoplasmic strands of enhanced rigidity and fasciate appearance radiate from the rim of the lenticular nucleus through the vacuole, frequently split once or twice and are attached to the helical chloroplast bands in the peripheral cytoplasm. The nucleus is encased in tubulin and a web of F-actin. Bundles of microtubules, emerging from the nuclear rim, are organized into dividing fascicles within the strands and reach to the inner surface of the chloroplast envelope. Organelles are translocated in both directions along similarly arranged fascicles of microfilament bundles which extend from the nucleus to the peripheral actin cytoskeleton. Application of microtubule- and/or microfilament-depolymerizing drugs affected the position of the nucleus only slowly, but in distinct ways. The differential effects suggest that nuclear centering depends on the tensional integrity of the perinuclear scaffold, with microfilaments conveying tension along stabilized microtubules and the actin cytoskeleton integrating the translocation forces generated within the scaffold.
Starting Page	54
Ending Page	63
Page Count	10
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	204
Issue Number	1
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	1997-12-02
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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