Abstract
msi1 mutant was identified as one of the mutants which seeds autonomously develop without fertilization. Nuclear division normally progress in endosperm of msi1 gametophyto and endosperm become to polyploid cell. However cellularization of polyploid endosperm do not complete. MSI1 repress gene transcription as one of the component of polycomb protein complex.
msi1 homozygote plant is lethal at early embryogenesis. On the other hand, the others one of the component of polycomb group complex, medea's mutant is viable. Thus MSI1 might have another function except component of polycomb group complex. Here we aim at finding new role of MSI1 protein in plant development by genetic and cell biological analysis.
