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Fig. 1 | Molecular Horticulture

Fig. 1

From: Hypothesis: the subcellular senescence sequence of a mesophyll cell mirrors the cell origin and evolution

Fig. 1

Schematic illustration of mirroring relationship between senescence progression and evolution of a plant mesophyll cell. The chloroplasts (c) are the first subcellular organelle to senesce and likely the last organelle to be evolved from endosymbiotic photosynthetic bacteria. The dismantlement of mitochondria (m) occurs at some time point after the chloroplast senescence, and the mitochondria is believed to be evolved by engulfing an aerobic bacterium prior to the formation of the chloroplasts. In contrast, the disintegration of the nucleus (n) is a relatively late event during senescence while the formation of the nucleus likely takes place early during cell evolution. The “soup” of the completely senescent cell resembles the ‘hatcheries” for the origin of the first protocell. Question marker (?) represents unknown event by which a subcellular organelle such as Golgi apparatus (g) or vacuole (v) is senescent or evolved. The arrowed yellow line indicates the order of subcellular senescence while the arrowed blue line represents the sequential processes of the cell origin and evolution

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