禾穀類花粉の発芽に関する研究

I. 柱頭上の花粉における液の滲出

抄録

1. Viable pollen grains exude a liquid as soon as they adhere to the stigma, manifesting at the same time a form change by the formation of wart-like bulgings covering the surface. This apparent form change proceeds after a definite pattern, and the grains return to their original smooth shape in about thirty to sixty seconds from the beginning of the process. The phenomenon was recognized hitherto in 28 species belonging to 19 genera of Gramineae.
2. The liquid accumulates at the point of contact of the grain with a stigma hair, and fills out the space between them. The liquid can be always observed when germination occurs, whereas pollen grains which do not exude it are incapable of germination.