Ultrastructure of Two-Celled Pollen Grains of Sesbania speciosa-A Multipurpose Fast-Growing Legume

抄録

The most interesting and peculiar feature of mature pollen grains in S. speciosa is the presence of intine wall ingrowths and membranous labyrinths in the vegetative cell at the aperture region. The presence of mitochondria in the vicinity of these wall ingrowths makes the vegetative cell to behave as a transfer cell. The second important feature is the occurrence in the vegetative cytoplasm of large quantity of stacked endoplasmic reticulum, thus the vege-tative cell functions as storage organ. The third important feature is the presence of plastids in the vegetative cell cytoplasm whereas the generative cell cytoplasm is devoid of these, thus supporting the maternal inheritance of plastids.