Hu Lingyu, Li Yi, Zhou Kun, Shi Kaili, Niu Yi, Qu Feng, Zhang Shenglin, He Weidi, Wu Yuanli
College of Horticulture and Landscape Architecture, Southwest University, Chongqing 400716, China.
Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences, Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization, Ministry of Agriculture and Rural Affairs Guangdong Provincial Key Laboratory of Science and Technology Research on Fruit Tree, Guangzhou 510640, China.
Foods. 2025 Jul 28;14(15):2638. doi: 10.3390/foods14152638.
Banana fruits are harvested and then undergo rapid ripening and senescence, sharply limiting their shelf-life and marketability. -inositol (MI) is an important regulator in ethylene production and reactive oxygen species (ROS) accumulation; however, its involvement in the postharvest ripening process of banana remains to be determined. This study found that postharvest application of MI could efficiently delay the fruit ripening and extend the time in which the luster, color, and hardness were maintained in two cultivars with contrasting storage characteristics, storable 'Brazil' and unstorable 'Fenza No. 1', when stored at room temperature (23 °C ± 2 °C). Moreover, physiological, metabolic, and gene expression analyses indicated that MI application improved MI metabolism and postponed ethylene biosynthesis and cell wall loosening. The decrease in ethylene production was associated with a reduction in the expression of and genes. MI treatment decreased the expressions of , , and , which may account for the delay in softening. In addition, the application of MI could alleviate ROS-mediated senescence and cell membrane damage by promoting the activities of SOD, POD, and anti-O and decreasing PPO activity. This study shed light on the function of MI in regulating the postharvest ripening and senescence of bananas and provided an efficient strategy for extending shelf-life and reduce losses.
香蕉果实采摘后会迅速成熟和衰老，这极大地限制了它们的货架期和市场适销性。肌醇（MI）是乙烯生成和活性氧（ROS）积累的重要调节因子；然而，其在香蕉采后成熟过程中的作用仍有待确定。本研究发现，采后施用MI能够有效延缓果实成熟，并延长了具有不同贮藏特性的两个品种，即耐贮藏的‘巴西’和不耐贮藏的‘粉杂一号’，在室温（23℃±2℃）下贮藏时保持光泽、颜色和硬度的时间。此外，生理、代谢和基因表达分析表明，施用MI改善了MI代谢，推迟了乙烯生物合成和细胞壁松弛。乙烯产量的降低与和基因表达的减少有关。MI处理降低了、和的表达，这可能是软化延迟的原因。此外，施用MI可通过提高超氧化物歧化酶（SOD）、过氧化物酶（POD）和抗坏血酸过氧化物酶（anti-O）的活性并降低多酚氧化酶（PPO）活性来减轻ROS介导的衰老和细胞膜损伤。本研究揭示了MI在调控香蕉采后成熟和衰老中的作用，并为延长货架期和减少损失提供了一种有效的策略。
