Effects of paclobutrazol and chilling temperatures on lipids, antioxidants and ATPase activity of plasma membrane isolated from green bell pepper fruits.
Lurie, S.; Ronen, R.; Lipsker, Z.; Aloni, B.;
Physiologia Plantarum Year: 1994 Vol: 91 Issue: 4 Pages: 593-598 Ref: 26 ref.
1994
บทคัดย่อ
ABSTRACT :
Application of 50 mg paclobutrazol/litre at anthesis affected plant growth and fruit morphology in Capsicum annuum cv. Maor. The plants were more compact and the fruits were less elongated than control fruits. Plasma membrane material increased by about 60% on a FW basis in fruits on treated plants. At harvest, the sterol:phospholipid ratio, and phospholipid fatty acid composition were similar in control and treated fruits. However, plasma membrane ATPase activity in treated fruits was twice as high as in control fruits. After storage at chilling temperature (2 deg C), the control fruits developed more chilling injury, and had greater weight loss and a higher rate of K+ leakage than treated fruits. Plasma membrane phospholipid content decreased and saturation of phospholipid fatty acids was higher than in control fruits. These 2 changes were largely absent in plasma membrane from treated fruits. At harvest, antioxidant levels in the plasma membrane of paclobutrazol-treated fruits were higher tha
n in those of controls and changed little during storage, whereas levels in control fruit plasma membrane decreased by 66%. ATPase activity increased and then decreased in control fruits held at low temperature, whereas in treated fruits activity was constant. The protective effect of paclobutrazol against chilling injury of bell peppers may result from a combination of its effect on fruit morphology and protection of the lipids against oxidative stress.