Abstract
The aim of this study was to investigate the effect of 20 mg/L 2,4-D on the quality during ripening of on-tree longan fruits. We investigated external and internal properties of the on-tree longan fruits. The results showed that 2,4-D treatment promotes the growth based on the fruit size and weight. The respiration rate, contents of TSS, total soluble sugar, sucrose, glucose, fructose, and hexose revealed an increasing tendency with advancing the maturity and reached the high status during 110-126DPA. By contrast, the relative electric conductivity and TA content displayed a declining trend during the ripening stage, increase with the senescence. All these pieces of information indicated that 2,4-D treatment could effectively promote the sensory quality of on-tree longan fruit, prolong the harvest time to 118DPA, while CK should harvest before 110DPA.
Highlights
Longan (Dimocarpus longan Lour.) is a kind of tropical and subtropical fruit with high business value, it has been cultivated widely in many countries, especially in China, and other Asia-Pacific areas[1,2,3]
Among that sugars play a vital role in fruit quality and are considered as a signal molecule during fruit growth and development which are determined by sugar component and content[5, 6]
Previous studies have shown that longan fruit sugar receding may occur at unreasonable harvest time, resulting in a change of sugar composition[8], contents of total soluble solids and titratable acidity increase during fruit development, and this is related to the content of sugar[9,10,11], control sugar receding is an important subject to preserve the quality of longan fruit
Summary
Longan (Dimocarpus longan Lour.) is a kind of tropical and subtropical fruit with high business value, it has been cultivated widely in many countries, especially in China, and other Asia-Pacific areas[1,2,3]. It contains rich nutrients and many other pharmacological materials[4]. Respiration will consume energy if harvest at the non-optimal time, decrease fruit weight, and accelerate senescence[15], during fruit development and ripening stage, cell membrane permeability has changed due to many secondary metabolites produced[10]. It is necessary to choose an appropriate harvest time
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