报告题目：Egg Cell Activation and Embryo Patterning in Cereals

报 告 人：Prof. Thomas Dresselhaus

主持人/邀请人：李超 研究员

报告时间：2026年9月2日 上午9:30

报告地点：闵行校区生科楼534会议室

报告人简介：

Thomas Dresselhaus教授现任德国雷根斯堡大学植物细胞生物学、生物化学与生物技术系讲席教授。自2006年起任职于雷根斯堡大学，长期从事植物生殖与发育生物学研究。曾任国际植物有性生殖研究协会（IAPSRR）主席、雷根斯堡大学生物学与临床前医学学院科研院长及院长等职务。目前担任德国科学基金会（DFG）植物科学评审委员会委员，并任DFG“谷类植物干细胞系统（Cereal Stem Cell Systems）”研究单元负责人。Dresselhaus教授的研究主要聚焦于植物生殖系与干细胞发育、配子发生与相互作用、受精、早期胚胎与种子发育，以及环境胁迫下的植物生殖响应，主要以玉米和拟南芥为研究体系。在植物受精、配子信号、胚胎发育及谷类植物生殖等领域取得了系列重要成果，研究成果发表于 Cell、Nature、Science、Nature Plants、The Plant Cell、Nature Communications、Plant Physiology、New Phytologist等国际期刊。其代表性研究包括玉米受精后合子基因组激活、植物精细胞运输、雌雄配子Ca2+信号、玉米花粉管RALF信号，以及受精诱导的ROS信号与胚胎发育调控等，为深入解析植物受精及早期胚胎发育的分子机制提供了重要理论基础。

报告内容简介：

Plant embryogenesis is initiated by egg cell activation and requires the subsequent establishment of cell identities, embryonic axes, and stem cell niches. This presentation will discuss molecular mechanisms controlling these processes in cereals, with a focus on maize and its apomictic relative Tripsacum. First, I will address mechanisms of egg cell activation and parthenogenesis. Particular emphasis will be placed on transcription factors, which are activated after fertilization and can trigger parthenogenetic embryo development when ectopically expressed in the egg cell. The second part will focus on embryo patterning and meristem establishment in maize. The roles of signaling peptides in the endosperm surrounding region (ESR) and early embryo as well transcription factors will be highlighted, that are required for embryo patterning and specification of embryonic meristems. Together, our findings provide a first mechanistic framework linking egg-cell activation, intercompartmental signalling and stem-cell niche establishment during early cereal embryogenesis.