Figure 3. Diagram illustrating within-fruit water potential gradient associated with watercore appearance. (IMAGE)
Caption
In the normal apple flesh, light reflection is randomly caused by the numerous air spaces present in apoplastic space (mostly intercellular air spaces), and then light is scattered and does not pass through from the cut surface to deeper tissue, causing a loss of transparency. Contrastingly in watercored apples, apoplastic spaces including air spaces in watercore flesh were filled with water, alcohols including ethanol (EtOH), and other solutes, which increases tissue transparency in addition to the yellowish appearance changes. These findings were obtained by performing picoPPESI-MS analysis combined with two principally different osmotic pressure measurements. Note that putative apoplastic solutes associated with turgor (p) gradient and significant water flow toward the watercore region (blue arrows) were drawn, and the solutes contained in the cells are removed to simplify. π: osmotic pressure; VB: vascular bundle; Xy: xylem; EtOH: ethanol.
Credit
Ehime University
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