Mitotic microtubule development and histone H3 phosphorylation in the holocentric chromosomes of Rhynchospora tenuis (Cyperaceae)

Genetica
M GuerraM J Puertas

Abstract

In the present work we report the phosphorylation pattern of histone H3 and the development of microtubular structures using immunostaining techniques, in mitosis of Rhynchospora tenuis (2n = 4), a Cyperaceae with holocentric chromosomes. The main features of the holocentric chromosomes of R. tenuis coincide with those of other species namely: the absence of primary constriction in prometaphase and metaphase, and the parallel separation of sister chromatids at anaphase. Additionaly, we observed a highly conserved chromosome positioning at anaphase and early telophase sister nuclei. Four microtubule arrangements were distinguished during the root tip cell cycle. Interphase cells showed a cortical microtubule arrangement that progressively forms the characteristic pre-prophase band. At prometaphase the microtubules were homogeneously distributed around the nuclear envelope. Metaphase cells displayed the spindle arrangement with kinetochore microtubules attached throughout the entire chromosome extension. At anaphase kinetochoric microtubules become progressively shorter, whereas bundles of interzonal microtubules became increasingly broader and denser. At late telophase the microtubules were observed equatorially extended beyond ...Continue Reading

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Citations

May 22, 2009·The Journal of Heredity·Marielle C SchneiderDoralice M Cella
Sep 7, 2011·Cytogenetic and Genome Research·C G Sotero-CaioM Guerra
Mar 15, 2016·Frontiers in Plant Science·Pavel NeumannJiří Macas
Feb 27, 2007·Biochimica Et Biophysica Acta·Andreas HoubenLiudmila Vlasenko
Mar 30, 2011·The Plant Journal : for Cell and Molecular Biology·J S Pat Heslop-Harrison, Trude Schwarzacher
Oct 20, 2012·The Plant Journal : for Cell and Molecular Biology·Stefan HeckmannAndreas Houben
Nov 19, 2015·Frontiers in Plant Science·Maria CuacosStefan Heckmann

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