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. 1999 May;11(5):793–808. doi: 10.1105/tpc.11.5.793

Molecular markers and cell cycle inhibitors show the importance of cell cycle progression in nematode-induced galls and syncytia.

J de Almeida Engler 1, V De Vleesschauwer 1, S Burssens 1, J L Celenza Jr 1, D Inzé 1, M Van Montagu 1, G Engler 1, G Gheysen 1
PMCID: PMC144216  PMID: 10330466

Abstract

Root knot and cyst nematodes induce large multinucleated cells, designated giant cells and syncytia, respectively, in plant roots. We have used molecular markers to study cell cycle progression in these specialized feeding cells. In situ hybridization with two cyclin-dependent kinases and two cyclins showed that these genes were induced very early in galls and syncytia and that the feeding cells progressed through the G2 phase. By using cell cycle blockers, DNA synthesis and progression through the G2 phase, or mitosis, were shown to be essential for gall and syncytium establishment. When mitosis was blocked, further gall development was arrested. This result demonstrates that cycles of endoreduplication or other methods of DNA amplification are insufficient to drive giant cell expansion. On the other hand, syncytium development was much less affected by a mitotic block; however, syncytium expansion was inhibited.

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Selected References

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