ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Mitochondrial ultrastructure and carbohydrate dynamics of apple fruits under conditions of strict anoxia.

Generozova, I. P.; Andreev, V. Yu.; Vartapetyan, V. V.; Vartapetyan, B. B.;

Soviet Plant Physiology Year: 1990 Vol: 37 Issue: 2 (1) Pages: 199-206 Ref: 15 ref.

1990

บทคัดย่อ

In order to clarify the role played by storage carbohydrates in stabilization of mitochondrial membranes under conditions excluding oxidative phosphorylation, the effect was studied of strict anoxia on apple fruits (cv. Northern Sinap) during development or during postharvest storage at 1 deg C. Mitochondrial ultrastructure was investigated, together with the contents of sugars, polysaccharides, sorbitol and malate. A marked resistance of mitochondrial structure to prolonged anoxia (14-19 days) was observed during the period of fruit development (July-Aug.) and at the start of storage (Sep.-Nov.). Resistance to anoxia declined sharply later on, and a 2-day period of anoxia in Jan.-Feb. led to total destruction of cell membranes. Under conditions of anoxia created at the start of fruit storage, the content of sugars (predominantly sucrose and fructose), polysaccharides and malate declined, whereas that of sorbitol rose towards the end of anaerobic exposure. During a second period of storage under conditions of anoxia, only the sugar content underwent any reliable change (a decrease). It is hypothesized that significant reserves of endogenous sugars and a low intensity of metabolism are responsible for the high resistance to prolonged anoxia up to the start of storage. However, when anoxia is present during the second half of the storage period, the above factors do not ensure high resistance.