Intracellular pH and its regulation in Pelvetia zygotes
Article Abstract:
The importance of intracellular pH (pHi) in the early developmental stages of plants was studied through measurements made on Pelvetia eggs and embryos using ion-selective microeletrodes. In newly fertilized eggs, pHi was found to be 7.57 plus-minus 0.09 but this decreased soon after fertilization. Low proton motive force values were also obtained, suggesting that secondary active transport is not linked with H+ and that solute transport is induced by the Na+ electrochemcal potential. pHi was strictly controlled by zygotes tested over a broad extracellular pH range. Results suggest that H+-ATPase- and Na+/H+ antiporter-induced proton pumping assist in pH regulation.
Publication Name: Developmental Biology
Subject: Biological sciences
ISSN: 0012-1606
Year: 1993
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Pronuclear positioning and migration during fertilization in Pelvetia
Article Abstract:
A study was conducted on the positioning and movement of egg and sperm pronuclei during fertilization in Pelvetia. Results revealed that prior to and following fertilization, no migration occurred in the egg pronucleus and that microtubules and microfilaments contributed to pronuclear anchoring in the cell center. The migration of sperm pronucleus, on the other hand, was found to be linear and oriented towards the egg pronucleus. Sperm penetration was dependent on microfilaments, while its migration was dependent on microtubules.
Publication Name: Developmental Biology
Subject: Biological sciences
ISSN: 0012-1606
Year: 1993
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Establishment and expression of cellular polarity in fucoid zygotes
Article Abstract:
The establishment and expression of polarity among the lower eukaryotes represented by the the genera Fucus and Pelvetia are studied. Embryonic polarity in fucoid zygotes encompasses selection of an axis, transduction and amplification of the positional information leading to localization of determinants within the cell (axis formation), and irreversible spatial fixation of the determinants (axis fixation). This polarity occurs during the first half of the cell cycle. Mechanisms which cause polarity are not yet clear.
Publication Name: Microbiological Reviews
Subject: Biological sciences
ISSN: 0146-0749
Year: 1992
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