Journal
AUTOPHAGY
Volume 9, Issue 8, Pages 1159-1166Publisher
LANDES BIOSCIENCE
DOI: 10.4161/auto.24784
Keywords
amorphous area; autophagosome; autolysosome; cytoplasm; engulfment; membrane; mesophyll; plant; plastid; tepal; vacuole
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Funding
- Thailand Research Fund (TRF)
- Postharvest Technology Innovation Center (PHTIC)
- Commission on Higher Education at the Ministry of Education
- Kasetsart University Research and Development Institute (KURDI)
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In Dendrobium flowers some tepal mesophyll cells showed cytoplasmic areas devoid of large organelles. Such amorphous areas comprised up to about 40% of the cross-section of a cell. The areas were not bound by a membrane. The origin of these areas is not known. We show data suggesting that they can be formed from vesicle-like organelles. The data imply that these organelles and other material become degraded inside the cytoplasm. This can be regarded as a form of autophagy. The amorphous areas became surrounded by small vacuoles, vesicles or double membranes. These seemed to merge and thereby sequester the areas. Degradation of the amorphous areas therefore seemed to involve macroautophagy.
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