soheila mohammadrRezakhani; zahra pakkish
Abstract
Storage of Lime (Citrus aurantifolia L.) fruits, originally a tropical fruits, in low temperature confronts with several difficulties due to the risk of chilling injury (CI). To develop an effective method aiming to reduce CI, the effects of treatments containing 0, 0.5 and 1 Mg/lit brassinosteroids ...
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Storage of Lime (Citrus aurantifolia L.) fruits, originally a tropical fruits, in low temperature confronts with several difficulties due to the risk of chilling injury (CI). To develop an effective method aiming to reduce CI, the effects of treatments containing 0, 0.5 and 1 Mg/lit brassinosteroids (BRs) and hot water (HW) including 20°C as control, 45 and 55°C for 30 minute on CI was studied. Moreover lipid peroxidaion, hydrogen peroxide, catalase (CAT) and peroxidase (POD) activities were investigated in lime fruits stored at 1°C for 21 days. The CI, lipid peroxidaion, hydrogen peroxide were significantly reduced by BRs treatment particularly at 1Mg/lit and 45°CHW treatment. Furthermore fruits treated with 1Mg/lit BRs and 45 °C HW treatment exhibited significantly higher CAT and POD activities in comparison with the control fruits. These results suggest that BRs and HW treatment protect lime fruits from CI by enhancing antioxidant enzymes such as POD and CAT activities, and reduce lipid peroxidaion, hydrogen peroxide contents, and maintaining membrane integrity.
Hamideh Mohammadi; Zahra Pakkish; Vahidreza Saffari
Abstract
Peach (Prunus persica L. Batsch.) is produced in most areas of Iran, where flowering is hindered by temperature. Using plant growth regulators to delay bloom is a suggestive measure to avoid frost damage. The objective of this study was to determine the effects of methyl jasmonate (MJ) and salicylic ...
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Peach (Prunus persica L. Batsch.) is produced in most areas of Iran, where flowering is hindered by temperature. Using plant growth regulators to delay bloom is a suggestive measure to avoid frost damage. The objective of this study was to determine the effects of methyl jasmonate (MJ) and salicylic acid (SA) on peach bloom delay and yield. This study evaluated the applications of MJ 0 (control, water only), 100 and 200 mg L-1 and SA at 150 and 300 mg L-1 at swollen bud and green tip stages. In ‘Elberta’ peach, MJ at 200 mg L-1, its combinations with SA at 150 mg L-1 and MJ 200 mg L-1 and SA300 mg L-1 together at the two stages (green tip, swollen bud stages) delayed blooming for 6 and 8 days, respectively. The maturity and ripening of treated peach fruits were delayed for 8-12 days in green tip and swollen bud stage. Flowering percentage amount (57.83-61.80%), fruit set amount (22.59-23.53%) and yield (1.69-1.72 kg cm-2 branch) were increased by MJ 200 mg L-1 and SA300 mg L-1 treatments compared to the control treatment (flowering percentage amount (39.31%), fruit set amount (6.25%) and yield (0.82 kg cm-2 branch). The interactions of MJ and SA had more impacts on flowering (89.53%), fruit set (33.22%), fruit weight average (124.93 g), and yield (2.09 kg cm-2 branch)compared to their individual application. The present study was the first evidence for the SA and MJ effect on bloom delay, flowering and fruiting of peach.
