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Melatonin affects cuticular wax profile in rabbiteye blueberry (Vaccinium ashei) during fruit development.

Yaru Cao,Yunxiang Zang,Sangchi Wu,Ting Li,Jia Li,Kai-Li Xu,Seung-Beom Hong,Bo-Ping Wu,Wangshu Zhang,Weiwei Zheng

Published 2022 in Food Chemistry

ABSTRACT

Cuticular wax has been implicated in the first line of plant defense mechanism against external stresses. In this study, cuticular wax on the fruits of two rabbiteye blueberry cultivars cv. Baldwin and Brightwell were examined in terms of the morphology and chemical composition during fruit development in the presence and absence of pre-harvest melatonin (MT) treatment. It revealed that the crystal wax appeared as numerous tubules, and its morphology was not affected by MT treatment. A dominant constituent of triterpenoid at veraison stage was β-amyrin (45.62% of total wax) in Baldwin and oleanolic acid (22.79% of total wax) in Brightwell. Exogenous MT application significantly promoted fruit quality and increased total content of cuticular wax, however, the effect of MT on individual wax components greatly varied depending on cultivars and fruit developmental stage. Consequently, MT application may enhance sustainability of post-harvest fruit production systems by facilitating accumulation of cuticular wax.

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