Origin and behavior of bicentriolar centrosomes in the bryophyteRiella americana

Autor:	R. R. Robbins
Rok vydání:	1984
Předmět:	biology Spermatid Centriole Riella Cell Biology Plant Science General Medicine Anatomy biology.organism_classification Spindle pole body Cell biology medicine.anatomical_structure Centrosome Microtubule medicine Ultrastructure Basal body
Zdroj:	Protoplasma. 121:114-119
ISSN:	1615-6102 0033-183X
DOI:	10.1007/bf01279757
Popis:	Basal bodies in embryophyte spermatozoids develop from centrosomes which arisede novo in spermatid mother cells (SMC). The centrosomes at SMC spindle poles in those land plants producing biflagellated sperms comprise a coaxial pair of centrioles, a bicentriole (BC). Ultrastructural observations of antheridia of the aquatic liverwortRiella americana indicate that the centrosome is first evident as a dark staining body on the outer surface of the nucleus. Numerous short microtubules (MT) diverge from this body which next separates into two lobes, each with divergent MTs. Within each lobe, a BC differentiates-the cartwheel hub and spokes developing before the triplet MTs. Constituent centrioles of each BC are apposed by their proximal ends and connected only by the central hub. As the BCs migrate toward opposite spindle poles, they appear to be connected by MTs that terminate in granular material partially investing each BC. Each spermatid resulting from SMC division will inherit a bicentriole.
Databáze:	OpenAIRE
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