Studies on the relationship of the microstructure of Red Globe grape epidermis, enzyme activity and SO2 damage
H. Zhang, S. Wang, D. Xiu, Y. Guo, L. Li, W. Guan, Y. Luo, Q. Kong
ISHS Acta Horticulturae 628:555-561
2003
บทคัดย่อ
The epidermis of ‘Red Globe’ grape was shown to be more sensitive to SO2 than that of ‘Longyan’ grape as some bleach spots occurred easily on its surface. Epidermis was shown to be the main entrance for the external SO2 to penetrate inside the fruit. The epidermis microstructure of ‘Red Globe’ grape and the microstructure of the area damaged by SO2 were observed with a scanning electron microscope. Epidermis structure showed a close relationship with the sensitivity to SO2. ‘Red Globe’ grape showed a loose epidermis wax structure with some holes while ‘Longyan’ grape showed a tight epidermis wax structure. The wax structure of the epidermis was destroyed by the SO2, leaving the epidermis exposed to the SO2. The peel of ‘Red Globe’ grape had a lower concentration of superoxide dismutase (SOD) than that of ‘Longyan’ grape. Chloramphenicol acetyltransferase (CAT) activity decreased rapidly at the first stage of storage in the peel of ‘Red Globe’ grape. Malondialdehyde (MDA) concentration in the peel of ‘Red Globe’ grape showed at greater increase than that of ‘Kyoho’ grape, which was more resistant to SO2.