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<\/figure>Plants have versatile morphologies and create complex organs including flowers, leaves, roots and stems. The basis of morphology formation is to establish proper orientation known as the body axis. In most plants, fertilized eggs divide asymmetrically to establish the vertical axis (Figure). However, since fertilized eggs of flowering plants develop deeply within flowers or seeds, how the fertilized egg becomes polarized and how it divides asymmetrically remains to be answered.<\/p>\n<\/div><\/div>\n\n\n\n
Using Arabidopsis thaliana<\/em>, we successfully observed the internal structure of fertilized plant eggs in real time. We discovered the spatiotemporal dynamics of cytoskeleton and organelles in fertilized eggs, which contribute to the polarity establishment. For example, before fertilization, microtubules are oriented along the vertical axis, but this alignment collapses upon fertilization. The microtubules then form a ring-like structure that moves along the elongating zygotes. On the other hand, actin fibers are oriented along the vertical axis and are responsible for the apical movement of the nucleus.<\/p>\n\n\n\n