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논문 기본 정보

자료유형
학술저널
저자정보
Lee, Kyu-Bae (Department of Biological Science Education, College of Education, Chosun University) Mahlberg, Paul G. (Dept. of Biology, Indiana Univ.)
저널정보
한국식물학회 식물학회지 식물학회지 제42권 제1호
발행연도
1999.1
수록면
57 - 62 (6page)

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The ultrastructure of nonarticulated laticifers in the seedlings of Euphorbia maculata was studied at various developmental stages. The apical regions of the seedling laticifers growing intrusively contained large nuclei with mainly euchromatin and dense cytoplasm possessing various and many organelles such as rich ribosomes, several small vacuoles, giant mitochondria with dense matrices, rough endoplasmic reticulum, dictysomes, and proplastids. This result suggested that the apical regions of laticifers were metabolically very active. Laticifers in seedlings at the firstleaf developmental stage did not contain latex particle. In seedlings at second-leaf growth stage, the laticifer cells contained numberous and elongated small vacuoles. These vacuoles appeared to arise by dilation of the endoplasmic reticulum and frequently possessed osmiophilic or electron-dense latex paticles. The small vacuoles fused with the large vacuole occupying the central portion of the subapical region of laticifers, and then the latex particles were released into the large central vacuole. The latex particles varied in size and were lightly or darkly stained. Proplastids with a dense matrix and a few osmiophilic plastoglobuli were filled with an elongated starch grain and thus were transformed into amyloplasts. Latex particles were initially produced in the laticifers after seedlings had developed their second young leaves. In seedlings at forth-leaf stage, latex particles with an alveolated rim were found in the laticifers.

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