A Phase-Contrast Microscopic Study of Pollengrain Germination, Nuclear Movement and Pollentube Mitosis in Tradescantia virginiana

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Abstract
The kinetics of pollen grain germination, nuclear movement and pollen tube mitosis in T. virginiana were studied by means of phase-contrast microscopy in vivo and in stained preparations. The vacuole in the pollen grain has an important function in pollen grain germination. Nuclear movements are ascribed to friction forces combined with a cytoplasmic pushing force. The generative nucleus passes the vegetative one in the pollen tube. This fact probably accounts for the controversy over the identity of the nucleus that first enters the pollen tube from the pollen grain. There is no evidence to support the idea of a "cell within a cell" condition of the pollen grain. Also, it seems unlikely that the vegetative nucleus is degenerative.

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