Observations on Halipthoros milfordensis, a marine phycomycete / by Thomas Paul Tharp.
| Author/creator | Tharp, Thomas Paul author. |
| Other author | Bland, Charles E., degree supervisor. |
| Other author | East Carolina University. Department of Biology. |
| Format | Theses and dissertations |
| Production | 1976. |
| Description | 84 leaves, 19 unnumbered leaves of plates : illustrations ; 28 cm |
| Supplemental Content | Access via ScholarShip |
| Subjects |
| Abstract | Light and electron microscope observations were made of the developmental morphology, life cycle, and host range of a strain of Haliphthoros milfordensis isolated from the white shrimp, Penaeus setiferus. A detailed study of each life cycle stage was conducted with the light microscope, however, ultrastructural analysis was limited to zoospores and the encystment process. Zoospores for this isolate, by virtue of their variation in shape and sub-apically attached flagella, are not as described previously for this genus. However, they are biflagellate, therefore characteristic of the class Oomycetes. Encystment of spores begins by flagellar retraction and rounding-up, and terminates with the formation of an external, spined cyst wall. Germination is monopolar, producing germ tubes of various dimensions which fan out into hyphae. Vegetative growth is accompanied by multibranching at right angles and fragmentation. Sporogenesis is holocarpic but unusual in that thallus conversion into spores occurs in delimited segments non-simultaneously, and in that spore cleavage is sequential, beginning in the sporangium and ending in the discharge tube. Unique ultrastructural features of this isolate concern organelle arrangement, vesicle morphology, and the mechanism whereby the striated spines form within the external cyst wall. |
| Local note | Joyner-"Presented to the faculty of the Department of Biology ... in partial fulfillment of the requirements for the degree Master of Arts in Biology." |
| General note | Presented to the faculty of the Department of Biology. |
| General note | Advisor: Charles E. Bland |
| Dissertation note | M.A. East Carolina University 1976 |
| Bibliography note | Includes bibliographical references (leaves 82-84). |
| Genre/form | Academic theses. |
| Genre/form | Academic theses. |
| Genre/form | Thèses et écrits académiques. |
Availability
| Library | Location | Call Number | Status | Item Actions |
|---|---|---|---|---|
| Joyner | University Archives | ASK AT SPECIAL COLLECTIONS DESK | ✔ Available | Request Material |
| Electronic Resources | Access Content Online | ✔ Available |