Mio K. Shiubta Mio K. Shiubta

Assistant Professor, Faculty of Science, Yamagata University *Profile is at the time of the award.

2026HagukumuBiology & Life sciences(hagukumu)

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Research topics: Role of the vegetative nucleus in guiding sperm cells in the growing pollen tube

Keyword

Summary: Angiosperm pollen delivers sperm cells through the pollen tube. The vegetative nucleus leads the sperm cells while undergoing dynamic shape changes, yet the mechanism underlying this morphological plasticity remains unknown. We previously established high resolution cytological observations using plant species with large genome sizes and discovered characteristic surface and internal structures of the vegetative nucleus. In this study, observations and analyses of the nuclear envelope and chromatin organization will be used to reveal the regulatory mechanisms underlying vegetative nuclear shape changes and to clarify how the vegetative nucleus alters its morphology while migrating through the pollen tube. Ultimately, the findings are expected to contribute to applications in plant crossing techniques, crop breeding, and the conservation of plant genetic resources.

Message

Angiosperm pollen delivers sperm cells to the egg by extending a thin tube called the pollen tube. During this process, the vegetative nucleus takes the lead and guides the sperm cells while undergoing large and dynamic changes in shape. However, the mechanisms by which the vegetative nucleus changes its shape and migrates through the pollen tube remain poorly understood. In this study, we will combine high resolution observations using plant species with large genome sizes with analyses in model plants. By focusing on the nuclear envelope and chromatin organization of the vegetative nucleus, we aim to elucidate the mechanisms that regulate its morphological changes. Through this support, I hope to further advance this research, deepen our understanding of plant reproduction, and ultimately contribute to applications in plant crossing techniques and crop breeding.