Abstract
Vacuolar collapse plays a direct role in the cell death of the interspecific hybrid of Nicotiana gossei Domin ×N. tabacum L. which exhibits hybrid lethality at the seedling stage. We have previously reported that cell death in these seedlings began at the base of hypocotyls and spread throughout the plant (Mino et al. 2002). A light microscopic analysis revealed that the process involved disruption of the intra-cellular membranes, plasmolysis, and retraction of the wall of the cell in hypocotyls. A transmission electron microscopic analysis showed that there were several abnormal structures, i.e. knob-like bodies on the tonoplast and small vesicles in the cytoplasm, and the disintegration of the tonoplast, in the cells of seedlings grown at 26°C. However, no such cytological defects were observed in the seedlings grown at 37°C, at which temperature the expression of lethality was suppressed. The activity levels of vacuolar processing enzyme (VPE), which might be involved in the vacuolar collapse of plant cells, temporarily increased in the seedlings grown at 26°C before apparent cell death proceeded, but it remained unchanged in the seedlings grown at 37°C. Applications of acetyl-l-tyrosyl-l-valyl-l-alanyl-l-aspart-1-aldehyde, an inhibitor for VPE, and cycloheximide to the seedlings suppressed VPE's activities, the formation of knob-like bodies on the tonoplast, and cell death. VPE might be involved in the structural anomalies on the tonoplast which lead to cell death triggered by vacuolar collapse in hybrid seedlings.
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Mino, M., Murata, N., Date, S. et al. Cell death in seedlings of the interspecific hybrid of Nicotiana gossei and N. tabacum; possible role of knob-like bodies formed on tonoplast in vacuolar-collapse-mediated cell death. Plant Cell Rep 26, 407–419 (2007). https://doi.org/10.1007/s00299-006-0261-z
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DOI: https://doi.org/10.1007/s00299-006-0261-z