ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Persistence of 14C-gibberellin A3 on the surface of Citrus fruit peel and on inert glass surfaces.

Greenberg, J.; Goldschmidt, E. E.;

Plant Growth Regulation Year: 1990 Vol: 9 Issue: 3 Pages: 215-226 Ref: 15 ref.

1990

บทคัดย่อ

Citrus fruits are treated with GA3 both pre- and postharvest to delay senescence and deterioration. The persistence of GA3 on plant surfaces was investigated using seedless grapefruits, cv. Marsh, and an inert glass model system. 14C-GA3 was applied to surfaces in aqueous treatment solutions or in waxing solutions. Dried-out treatment residues were removed by washing and analysed for total and GA3-like radioactivity. GA3 persisted without significant loss for at least 7 days in aqueous treatment solutions (pH 4.0 or 6.2) but was less persistent in the pH 10.4 waxing solution. Loss of total peel surface radioactivity was fast during the first 3 days, slowing down afterwards. After 14 days, 73% of the initial radioactivity could still be recovered from the fruit peel surface and 70% of the recovered radioactivity was still in the form of GA3. GA3 was somewhat more persistent in residues from pH 4 than pH 7 treatment solutions. Light had a slight enhancing effect on GA3 decomposition on fruit peel under growth chamber conditions. After 12 days at 100% RH, 88% of the radioactivity on glass surfaces was still in the form of GA3, as against 45% at 50% RH. Simulated field conditions, combining daily fluctuations in light, temperature and RH, markedly enhanced decomposition on glass surfaces. GA3 was very persistent (90% after 9 days) in the waxing residues on the fruit peel surface.