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J Integr Plant Biol, 1980, 22 (1): -, Research Article
Development of Gametophytes in Fokienia Cupressaceae
Chen Zu-keng and Wang Fu-hsiung
doi:
Abstract
The structure of the ovule and the development of the gametophytes in Fokienia, an endemic genus of Cupressaceae are described in some detail. Two wings, one small and one large, are developed along the micropylar end of the ovule and two resin canals are present in each of them. The material collected in the middle of April was already pollinated and the pollen began to germinate on the nucellus. The sterile cell, tube cell and spermatogenous cell have been formed in the tube in the first collection of April 17. At the end of June the division of the spermatogenous cell results in two sperms of Similar size and shape and the division plane is usually parallel to long axis of the pollen tube. Both sperms are effective in fertilization. 4096 free nuclei (actual counting, 3733—4224 ones) are produced through 12 times of repeated divisions of the functional megaspore, then cell walls appear among the free nuclei and cellular female gametophyte is formed. The number of archegonia varies from 6 to 16, mostly 9–12. The archegonial complex is enclosed by 2–3 layers of jacket cells. The neck cells are usually 4 in number, arranged in 1–2 layers. The central cell divides and results in the formation of one ventral canal nucleus and one egg nucleus. Fertilization takes place in the middle of the archegonium. The development of the gametophytes of Fokienia is more or less similar to that of Sabina.
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