1993 Fiscal Year Final Research Report Summary
Preliminary studies of structure and function of the haptonema.
| Project/Area Number |
03454014
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
植物形態・分類学
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| Research Institution | University of Tsukuba |
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Principal Investigator |
INOUE Isao Institute of Biological Sciences, University of Tsukuba Associate Professor, 生物科学系, 助教授 (70168433)
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| Project Period (FY) |
1991 – 1993
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| Keywords | haptonema / Haphtophyta / Prymnesiophyceae / Chrysochromulina / coiling / CICR |
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| Research Abstract |
The haptonema is a unique cellular organelle known only in the Prymnesiophyceae(=Haptophyceae). Ultrastructue, functional roles and biological significance of this organelle is not well understood. The aim of this study was to establish basic knowledge on the haptonema of both structural and functional aspects. Chrysochromulina was choosen to achieve the project. The following results and conclusions were obtained.
Chrysochromulina hirta, the haptonema plays an important role in food capture. Analysis of video-recorded food capturing and phagotrophic processes in C.hirata revealed that : Prey particles adhere and move on the haptonema towards the base ; They are accumulated at a point called particle aggregating center and transformed into tightly packed aggregate ; The aggregate is moved up to the tip of the haptonema ; The haptonema then bends in S-shape, resulting in delivery of the aggregate to the food vacuole. Based on these observations, it is concluded mixotrophy of Chrysochromulina hirta is achieved by integration of various properties of the haptonema including surface adhesion, surface motility, secretion of cement material and bending, which are obviously regulated in chronological order. The haptonema is composed of singlet microtubules arranged in an arc or a circle surronded by haptonemal ER.There components are arranged in asymmetrical fashion and has a single absolute configuration in relation to other cellular components such as the nucleus, food vacuole and the flagellar apparatus. The direction of haptonemal bending and coiling is precisely defined in reltion to its and*
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[Publications] Hori, H., Satow, Y., Inouye, I.and Chihara, M.: "Archebacteria vs Metabacteria : phylogenetic tree of organisms indicated by comparison of 5S ribosomal RNA sequences." In Evolution of Life. Fossils, Molecules and Culture. (ed.Osawa, S.and Honjo, T.), Springer-Verlag, Tokyo. 325-336 (1991)
Description
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