Exogenous 2,4-Epibrassinolide Treatment Maintains the Quality of Carambola Fruit Associated With Enhanced Antioxidant Capacity and Alternative Respiratory Metabolism.

Xiaoyang Zhu,Zunyang Song,Xueping Li,Junyi Li,Shuangling Xiao,Weixin Chen,Xiaochun Ding,Yuxin Chen,Silin Fan

doi:10.3389/fpls.2021.678295

Xiaoyang Zhu, Zunyang Song + Show 7 more

Open Access

https://doi.org/10.3389/fpls.2021.678295

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Abstract

Brassinosteroids act by delaying fruit ripening. The effects of different concentrations of 2,4-epibrassinolide (eBL) treatments on carambola fruit ripening were investigated. The results show that treatment of 2.8 mg L–1, eBL with 10 min effectively delays ripening and maintains the quality of carambola fruit. This is achieved by retarding color changes and firmness losses while maintaining high level of soluble protein content and vitamin C, and low organic acid content. eBL-delayed senescence may be due to the inhibition of respiration rate and enhanced antioxidant system. It is noteworthy that eBL treatment markedly reduces the content of fructose-6-phosphate (6-P-F) and enhances the activity of cytochrome oxidase (CCO), and the total activity of glucose-6-phosphate dehydrogenase (G-6-PDH) and 6-phosphate gluconate dehydrogenase (6-PGDH). eBL treatment induces the IAA and GA contents but reduces that of ABA. In general, senescence retardation and quality improvement by eBL treatment may be due to the enhanced antioxidant capacity and altered respiratory pathways.

Highlights

Carambola (Averrhoa carambola L.) fruit, commonly known as star fruit, is popular in Southeast Asian countries and China owing to its nutritional and pharmacological value (Gol et al, 2015)
Treatment with BRs has been proven to enhance the chilling tolerance in harvested tomato (Aghdam et al, 2012), 2,4-Epibrassinolide Maintains Carambola Fruit Quality bamboo shoots (Liu et al, 2016), and mango (Li et al, 2012), which primarily act by enhancing the activities of enzymes involved in antioxidant pathways and those related to proline and energy metabolism and membrane integrity
Our results showed that the contents of indole-3-acetic acid (IAA) and GA3 decreased with fruit ripening in carambola fruit, but eBL treatment delayed fruit ripening and

Summary

Introduction

Carambola (Averrhoa carambola L.) fruit, commonly known as star fruit, is popular in Southeast Asian countries and China owing to its nutritional and pharmacological value (Gol et al, 2015). It is an economically important fruit in tropical and subtropical areas and has been cultivated for hundreds of years. It is a juicy fruit that has a fragile and succulent pulp with attractive flesh and a distinctive flavor These fruit are highly perishable and have a high moisture content and susceptibility to mechanical damage and dehydration, which cause extensive postharvest losses and limit their marketability. Different techniques have been reported to extend the shelf-life and maintain the quality of harvested carambola fruit, including low-temperature storage (Ali et al, 2004), 1-methylcyclopropene treatment (Warren and Sargent, 2011), edible coatings (Gol et al, 2015), polyamines (PAs) treatment (Ahmad and Ali, 2019) and methyl jasmonate treatment (Mustafa et al, 2016)

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