Gametophytic development and fertilization in Macrocystis integrifolia

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Abstract
A cyto10gical investigation of gametophytic deve10pment and fertilization was conducted on cultured gametophytes of Macrocystis integrifolia. Most deve10pmental characteristics are similar to those previously reported for other members of the order Laminariales, although some modifications were noted in the production of antheridia and spermatozoids. One of the most significant contributions of this study concerned the nuclear cyto10gy of the egg during fertilization. There appear to be 2 fertilization phases: sperm penetration and nuclear activity within the egg. After penetration of the egg by 1 spermatozoid, the male nucleus remains in the peripheral cytoplasm while the egg nucleus undergoes mitosis, producing 2 daughter nuclei, one of which degenerates. The male nucleus then enters pro-phase and migrates to the remaining female nucleus, which is also in prophase. Karyogamy occurs while both nuclei are in prophase.

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