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Structural and ultrastructure changes show an increase in amoeboid forms in Heterosigma akashiwo (Raphidophyceae), during recovery after nutrient depletion
- Source :
- Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology. 151:965-973
- Publication Year :
- 2016
- Publisher :
- Informa UK Limited, 2016.
-
Abstract
- Heterosigma akashiwo shows remarkable ultrastructural changes during the recovery from a late stationary phase (“aged” culture) induced by nutrient depletion. H. akashiwo cells showed different morphological types in “aged” cultures, with an increase in irregular cells and cell fragments. The irregular cells mostly corresponded to an amoeboid shape of the cell. Many of these cells showed chloroplasts with a homogeneous matrix of medium electron density lacking most thylakoids and condensed nucleus, probably as a result of cyst/resting cells germination. In other cells, we observed nuclear blebbing without chromatin condensation and changes in mitochondrion ultrastructure. Some vegetative cells in active phase (“young” culture) were connected to each other, apparently phagocytizing cytoplasmic fragments and intact chloroplasts in the medium. An explanation for the phenomenon may reside in the need of acquiring organic material after nutrient reduction for a faster recovery. On the basis of our obse...
- Subjects :
- 0106 biological sciences
010604 marine biology & hydrobiology
Plant Science
Biology
Mitochondrion
biology.organism_classification
010603 evolutionary biology
01 natural sciences
Chloroplast
medicine.anatomical_structure
Prophase
Cytoplasm
Thylakoid
Botany
Ultrastructure
medicine
Biophysics
Heterosigma akashiwo
Nucleus
Ecology, Evolution, Behavior and Systematics
Subjects
Details
- ISSN :
- 17245575 and 11263504
- Volume :
- 151
- Database :
- OpenAIRE
- Journal :
- Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology
- Accession number :
- edsair.doi...........51f2ec5d532273c98b2d46a9da01362a