Melatonin treatment delays postharvest senescence and maintains the organoleptic quality of ‘Newhall’ navel orange (Citrus sinensis (L.) Osbeck) by inhibiting respiration and enhancing antioxidant capacity

The objective of this experiment was to determine how yield, size, and quality of fruit would respond to mechanical topping and manual pruning of mature `Frost nucellar' navel orange (Citrus sinensis) trees. Mechanically topping trees at 4.3 m (14 ft) or 4.9 m (16 ft) produced annual fruit yields and quality similar to that of untopped trees. Over the 4 years of this experiment, trees that were not manually pruned produced as much or more of the most valuable fruit sizes than either the severe or moderate manual pruning treatments without the associated pruning costs. Manual pruning did not improve fruit grade compared to unpruned trees. A highly significant positive and linear relationship was found between numbers of commercially valuable fruit and the total number of fruit produced annually within the range of 50,000 to 325,000 fruit/ha (20,235 to 131,528 fruit/acre). Manual pruning, which reduced total fruit numbers, reduced the number of commercially valuable fruit predictively according to this relationship.

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Melatonin treatment delays postharvest senescence and regulates reactive oxygen species metabolism in peach fruit

Postharvest Biology and Technology ◽

10.1016/j.postharvbio.2016.03.006 ◽

2016 ◽

Vol 118 ◽

pp. 103-110 ◽

Cited By ~ 102

Author(s):

Hui Gao ◽

Zheng Ke Zhang ◽

Hong Kang Chai ◽

Ni Cheng ◽

Yue Yang ◽

...

Keyword(s):

Reactive Oxygen Species ◽

Reactive Oxygen ◽

Oxygen Species ◽

Melatonin Treatment ◽

Peach Fruit ◽

Treatment Delays ◽

Reactive Oxygen Species Metabolism ◽

Postharvest Senescence

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Growth, yield and fruit quality of 'Washington Navel' orange on four rootstocks during the first four years of production.

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v85i3-4.3068 ◽

1969 ◽

Vol 85 (3-4) ◽

pp. 143-149

Author(s):

Félix M. Román-Pérez ◽

Agenol González-Vélez

Keyword(s):

Puerto Rico ◽

Fruit Quality ◽

Citrus Sinensis ◽

Growth Yield ◽

Tree Canopy ◽

Navel Orange ◽

Washington Navel ◽

Canopy Volume ◽

Swingle Citrumelo

Performance of the rootstocks 'Swingle citrumelo', 'Naronja' and mandarins 'Cleopatra' and 'Sun Chu Sha' on 'Washington Navel' orange [Citrus sinensis (L.)] was evaluated at Corozal and Isabela, Puerto Rico, during the first four years of production. Mean number of fruit per tree was significantly different between locations and among rootstocks for 1996-97 and 1997- 98. Data were not taken in 1998-99 because of damage caused by Hurricane Georges. The first two years the amount of fruit was significantly higher at Corozal than at Isabela, with Swingle producing greatest fruit yield. In 1999-00 (fourth year of production) no significant differences between locations were detected for tree canopy volume. Significant differences for internal fruit quality were detected between locations and among rootstocks for acidity, brix/acidity ratio and pH. No significant differences were observed for brix between locations or among rootstocks.

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Citral Delays Postharvest Senescence of Kiwifruit by Enhancing Antioxidant Capacity under Cold Storage

Journal of Food Quality ◽

10.1155/2021/6684172 ◽

2021 ◽

Vol 2021 ◽

pp. 1-9

Author(s):

Ling Wei ◽

Chuying Chen ◽

Chunpeng Wan ◽

Ming Chen ◽

Jinyin Chen

Keyword(s):

Weight Loss ◽

Antioxidant Capacity ◽

Aliphatic Aldehyde ◽

Inhibitory Effect ◽

Postharvest Quality ◽

Treatment Delays ◽

Antioxidant Enzyme System ◽

Total Flavonoids Content ◽

Ripening Index ◽

Postharvest Senescence

Citral is an aliphatic aldehyde extracted from citrus essential oil. The aim of the study was to examine how citral treatment affects the weight loss, firmness, respiration, and ripening index, as well as the antioxidant capacity of kiwifruit (Actinidia chinensis cv. ‘Jinkui’). The citral treatment was seen to reduce the weight loss, softening, and fruit respiration compared to control fruits. Citral treatment also had an inhibitory effect on ripening index, O2•− production rate, and malondialdehyde (MDA) accumulation. The degradations of ascorbic acid (AsA) content, total flavonoids content (TFC), and total phenolics content (TPC) were also suppressed by citral. In contrast, citral treatment induces the activation of antioxidant enzyme system such as superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT). Collectively, the results indicated that citral treatment delays postharvest senescence and prolongs storage life by enhancing antioxidant capacity in harvested kiwifruits. These findings suggest that citral has the potential to be used as a promising natural preservative for the extension of postharvest quality in harvested kiwifruit.

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