ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Calcium, magnesium and potassium ion uptake in normal and rin tomato plants and their accumulation in fruit cell wall.

Park, S. W.; Lee, S. K.;

Journal of the Korean Society for Horticultural Science Year: 1991 Vol: 32 Issue: 2 Pages: 163-172 Ref: 18 ref.

1991

บทคัดย่อ

Potted plants were irrigated with a standard nutrient solution containing 354 mg Ca(NO3)2, 404 mg KNO3 and 246 mg MgSO4/litre. The 3 different Ca treatments were 1, 2 or 3 times the standard solution concentration. Ca uptake was higher in plants of the non ripening mutant, rin, than in normal plants but it was not affected by the different Ca treatments. Mg concentration was generally higher in rin plants but K concentration was higher in the normal plants. Fruits were picked at the stage equivalent to the mature green stage of normal tomatoes and changes during ripening were studied. The total Ca concentration of the cell wall of normal tomato pericarp was maintained at 75 p.p.m. on a FW basis until the later stages of ripening, while that of rin fruits showed a rapid increase to about 130 p.p.m. during postharvest ripening. Cell wall total Mg concentration increased markedly in rin fruits during ripening but decreased in normal tomatoes. Cell wall total K increased slowly in rin fruits during ripening but decreased slightly in normal fruits. Cell wall-bound Ca, Mg and K concentrations increased initially during ripening, then decreased; in all cases, the decreases occurred at at earlier stage in normal fruits. Pectinmethylesterase activity was much higher in normal than in rin fruits; in both cases it increased during ripening. The roles of Ca, polygalacturonase and pectinmethylesterase in tomato ripening are discussed.