Fundamental studies on mating in forest trees (IV) . Development and germination of pollen in Pinus thunbergii and Pinus densiflora

Hashizume, H.

Bull. Tottori Univ. For, 5, 17-28


Accession: 014488872

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cf. FA 32 No. 2058.) Immature pollen grains separated experimentally from tetrads grew rapidly and began mitotic division ca. 10 days before pollen shedding. The time required from pollen-grain formation to pollen shedding was ca. 17 days for P. densiflora and ca. 18 days for P. thunbergii. Pollen grains acquired germinative capacity after the first of their three mitotic divisions, ca. 9 days before shedding.