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Morphological and quality characterization of grape berry and rachis in response to postharvest 1-methylcyclopropene and elevated oxygen and carbon dioxide atmospheres

Wang, Lei, Luo, Zisheng, Li, Junhao, Yang, Mingyi, Yan, Jiawei, Lu, Hongyan, Li, Dong, Chen, Cunkun, Aghdam, Morteza Soleimani, Wu, Bin, Li, Li
Postharvest biology and technology 2019 v.153 pp. 107-117
1-methylcyclopropene, Vitis labrusca, Vitis vinifera, abscission, carbon dioxide, chlorophyll, cultivars, esters, ethylene production, gene expression, gene expression regulation, grapes, membrane permeability, microstructure, oxygen, postharvest treatment, sensory properties, small fruits, storage time, terpenoids, titratable acidity, total soluble solids, transcription (genetics)
This research studied the morphological characterization and quality attributes of ‘Kyoho’ and ‘Yongyou NO.1’ (Vitis vinifera L. × Vitis labrusca L.) grape berry and rachis in response to postharvest treatment with 1-methylcyclopropene (1-MCP) alone or in combination with elevated 80% O2 (H-O2) / 20% CO2 (H-CO2). Results indicated that the integrated application of exogenous 1-MCP alone and combined with H-O2/H-CO2 significantly prevented the rachis browning and chlorophyll degradation, maintained the cellular microstructure integrity and promoted esters and terpenes synthesis. Additionally, the transcriptional expression of genes involved in ethylene biosynthesis was sharply downregulated by 1-MCP treatment in both cultivar rachis and berries. And genes expression related to softening was also downregulated by 1-MCP alone and plus elevated O2/CO2 atmospheres treatment. Particularly, the combinatorial treatment of 1-MCP and H-O2 effectively impeded berry abscission and alcohols accumulation; whereas 1-MCP with H-CO2 treatment maintained the membrane permeability in berries. Nevertheless, 1-MCP alone or in combination with elevated atmospheres did not significantly affect total soluble solids and titratable acidity and did not harm sensory quality in both ‘Kyoho’ and ‘Yongyou NO.1’ cultivars after 32 days of storage.