Changes in the morphology and functions of vacuoles during the death of ray parenchyma cells in Cryptomeria japonica
| Autor: | Izumi Arakawa, Satoshi Nakaba, Ryo Funada |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Programmed cell death Autolysis (biology) biology Chemistry Cryptomeria Xylem Vacuole biology.organism_classification 01 natural sciences Japonica Biomaterials Protein content 03 medical and health sciences 030104 developmental biology Parenchyma Biophysics 010606 plant biology & botany |
| Zdroj: | Journal of Wood Science. 64:177-185 |
| ISSN: | 1611-4663 1435-0211 |
| Popis: | Changes in the morphology and functions of vacuoles provide useful information about the mechanism of cell death. In the present study, we monitored the morphology and contents of vacuoles during the death of ray parenchyma cells in the conifer Cryptomeria japonica. In differentiating xylem, ray parenchyma cells had large central vacuoles. In sapwood, vacuoles in ray parenchyma cells contained proteins, an indication that one of the main functions of these vacuoles might be protein storage. A dramatic decrease in the protein content of some vacuoles was detected in the intermediate wood before the initiation of vacuole rupture. Although vacuole rupture was detected from the intermediate wood to the outermost heartwood, some vacuoles were obviously enlarged in the inner intermediate wood. Condensed nuclei were first observed after the rupture of these large vacuoles in ray parenchyma cells. It seems plausible that the autolysis of the contents of ray parenchyma cells might be caused by the rupture of the enlarged vacuoles in the inner intermediate wood. |
| Databáze: | OpenAIRE |
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