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University of Arizona (1965)

The development of the embryo sac in the Fouquieriaceae

Amlie, Rosemary

Titre : The development of the embryo sac in the Fouquieriaceae

Auteur : Amlie, Rosemary

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1965

Résumé
Flowers of Fouquieria splendens Englem.^ Fouquieria macdougalii Nash, and Idria columnaris Kell. were collected and slides were made of the ovary for a study of the anatomy of the ovule and embryo sac. Of the three species Fouquieria splendens were studied most intensively. The embryo sac was found to develop by the monosporic scheme, in which a tetrad of four megaspores is formed. Three of the megaspores disintegrate and one gives rise to the embryo sac, which has a "normal” development resulting in eight nuclei. The three antipodal cells soon separate from the remainder of the megagametophyte and disintegrate. The synergids also appear to disintegrate as the embryo sac matures. One of the important and interesting characteristics of the mature embryo sac of Fouquieria splendens was the presence of a haustorium. The available material of Fouquieria macdougalii and Idria columnaris was examined. Comparison revealed that the three species were similar in most respects. Unfortunately the material of Idria was not sufficiently mature to determine whether a haustorium is also one of its characteristics.

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