The Embryogeny of Pseudolarix kaempferi

The characteristics and different developmental stages in the embryogeny of Pseudolarix kaempferi (Lindl.) Gord. were investigated based on two previous papers, which are "The morphology and structure of stam-inate strobilus and the formation of microspore and male gametophyte in Pseudolarix kaemferi" and "The morphology and structure of femineus strobilus and the formation of megaspore and female gametophyte in Pseudolarix kaempferi". Pollen matures in early to middle April which is the time for pollination and germinates on nucellus in May. Later, two sperm nuclei move into pollen tube and archegonium forms at the same time. The egg cell in archegonium matures gradually. The zygote produces new cytoplasm, and subsequently develops from 4, 8, 16-cell proembryo to spherical one after the fertilization in June. The suapensor prolongs and the embryo proper enlarges in July. The root tip of embryo differentiates first, and then the shoot apex. Young embryo elongates, develops and differentiates further from Augest to September. The embryo matures in October, which conforms to simple polyembryony. The proembryo of P. kaemferi is referred to Pinus type.