ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Effect of the cationic chelator EDTA on the ripening of normal tomato fruit and the non-ripening mutants nor, rin and Nr.

Atta-Aly, M. A.; El-Beltagy, A. S.;

Postharvest Biology and Technology Year: 1992 Vol: 1 Issue: 4 Pages: 283-293 Ref: 21 ref.

1992

บทคัดย่อ

Tomato plants, cv. Rutgers, and lines containing the mutants nor, rin and Nr in a nearly isogenic background were grown in sand culture in a greenhouse. Fruit ripening was assessed by measuring increasing total surface reflectance, softening, ACC content and CO2 and ethylene evolution at defined stages during the development of Rutgers fruits and at physiologically equivalent stages for the mutants. Fruits from the nor and rin lines showed none of the characteristic changes associated with normal ripening except for a slight rise in ACC in overripe nor fruits and a slight increase in ethylene in mature nor and rin fruits. Nr fruits showed characteristic ripening changes at about half the rate of Rutgers fruits, but much higher ACC and slightly higher ethylene levels were found. EDTA (1 g/litre) was added to the nutrient solution and alterations to the ripening patterns of the 4 lines were observed. No significant changes were induced in Rutgers or Nr fruits, except that in the latter ethylene evolution was reduced by about 30% during ripening. However, nor and rin fruits were induced to colour to an extent not far from that of ripe Rutgers fruits. The rin fruits began to soften, and CO 2 evolution, ACC content and ethylene evolution were stimulated. Although only some of the characteristics of the climacteric pattern of ripening were restored to nor and rin lines, it is suggested that these results strengthen the link between the chelation of divalent cations such as calcium and the induction of the climacteric pattern of ripening in fruits.