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Inositol 1,4,5-trisphosphate As Fertilization Signal In Plants: Testcase Chlamydomonas Eugametos

A. Musgrave, F. Schuring, T. Munnik, K. Visser
Published 2004 · Biology

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Within the first 2 h of sexual reproduction, gametes of the green alga Chlamydomonas eugametos agglutinate, fuse via their mating structures, de-agglutinate and swim off as vis-à-vis pairs. During this period, increases in intracellular inositol 1,4,5-trisphosphate levels and changes in polyphosphoinositide synthesis were associated with cell fusion. The protein-kinase-C inhibitor staurosporine (0.1–0.2 μM) inhibited the de-agglutination of pairs and therefore prevented them swimming away, while earlier stages of mating such as agglutination or cell fusion were unaffected. The results suggest that inositol 1,4,5-trisphosphate and diacylglycerol are fertilization signals in C. eugametos. The idea that they could also be fertilization signals in higher plants is discussed in relation to in vitro embryogenesis.
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