TheSTUDGene Is Required for Male-Specific Cytokinesis after Telophase II of Meiosis inArabidopsis thaliana

摘要: During male meiosis in wild-type Arabidopsis the pollen mother cell (PMC) undergoes two meiotic nuclear divisions absence of division. Only after telophase II is a wall formed which partitions PMC into four microspores. Each microspore subsequent mitotic to produce one vegetative and sperm cells mature grain. In this paper we describe isolation phenotypic characterization mutations STUD (STD) gene, specifically required for male-specific cytokinesis meiosis. Although are normal std mutant plants, no walls resulting tetranucleate microspore. Despite division PMC, postmeiotic development coenocytic proceeds relatively normally, formation large grains contain nuclei up eight cells. Interestingly, these enlarged multiple extra behave as single gametophytes, producing only tubes partial fertility plants. Characterization process function mutants thus reveals different types developmental regulation. found following capable independently undergoing complete (including cytokinesis) nucleus would normally undertake. The ability products continue through mitosis does not depend on their separate cells, but controlled by some subcellular component within By contrast, grain functions unit produces tube despite presence cell, suggesting that at cellular level components.