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<p>To investigate the changes in persimmon peel color induced by CO<sub>2</sub> deastringency and preharvest 1-MCP spraying, we conducted a study with three experimental treatments: control, CO<sub>2</sub> deastringency (CO<sub>2</sub> group), and preharvest 1-MCP spray followed by CO<sub>2</sub> deastringency (1-MCP/CO<sub>2</sub> group). Relative to the control, the CO<sub>2</sub> group exhibited considerably higher fruit respiration rate, ethylene production, peel-color index, and total carotenoid content, accompanied by a marked decrease in chlorophyll content. The 1-MCP/CO<sub>2</sub> group maintained higher chlorophyll content, while all other indicators remained lower than those in the CO<sub>2</sub> group. Among the carotenoid biosynthesis genes examined, <i>DkGGPPS-1</i> predominated the control group, while <i>DkGGPPS-2</i> was present in the CO<sub>2</sub> and 1-MCP/CO<sub>2</sub> groups. In the CO<sub>2</sub> group, peak expression levels of <i>DkPSY-1</i> and <i>DkPSY-2</i> were 17.6–22.7 times the reference value; <i>DkPDS</i>, <i>DkZ-ISO</i>, and <i>DkZDS</i> were 5.5–9.3 times; <i>DkLCYB</i> was 1.9 times; and <i>DkBCH</i> was 5.5 times, whereas <i>DkLCYE</i> was markedly reduced. Alternatively, the control and 1-MCP/CO<sub>2</sub> groups exhibited relatively stable expression. In the control group, <i>DkNCED-1</i> was the main gene for making ABA. In the CO<sub>2</sub> and 1-MCP/CO<sub>2</sub> groups, <i>DkNCED-1</i> and <i>DkNCED-2</i> were the main genes, but 1-MCP could inhibit their expression. CO<sub>2</sub> deastringency and 1-MCP treatments considerably enhanced and suppressed the expression of <i>DkERF-1</i>, respectively. Overall, CO<sub>2</sub> deastringency and preharvest 1-MCP spraying influenced fruit respiration rate, ethylene production, total carotenoid and chlorophyll contents, and the expression of carotenoid biosynthesis genes, <i>NCED</i>, and <i>ERF</i>, thereby facilitating or delaying changes in persimmon peel color.</p>

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Effects of preharvest 1-methylcyclopropene (1-MCP) spraying on delaying peel-color change and expression of carotenogenic genes in CO2-deastringed persimmons

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  • 发表日期：

    2026年6月22日

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  • Kaixin Li,
  • Wenjun Wang,
  • Jing Huang,
  • Li Wang,
  • Bao Li

摘要

To investigate the changes in persimmon peel color induced by CO2 deastringency and preharvest 1-MCP spraying, we conducted a study with three experimental treatments: control, CO2 deastringency (CO2 group), and preharvest 1-MCP spray followed by CO2 deastringency (1-MCP/CO2 group). Relative to the control, the CO2 group exhibited considerably higher fruit respiration rate, ethylene production, peel-color index, and total carotenoid content, accompanied by a marked decrease in chlorophyll content. The 1-MCP/CO2 group maintained higher chlorophyll content, while all other indicators remained lower than those in the CO2 group. Among the carotenoid biosynthesis genes examined, DkGGPPS-1 predominated the control group, while DkGGPPS-2 was present in the CO2 and 1-MCP/CO2 groups. In the CO2 group, peak expression levels of DkPSY-1 and DkPSY-2 were 17.6–22.7 times the reference value; DkPDS, DkZ-ISO, and DkZDS were 5.5–9.3 times; DkLCYB was 1.9 times; and DkBCH was 5.5 times, whereas DkLCYE was markedly reduced. Alternatively, the control and 1-MCP/CO2 groups exhibited relatively stable expression. In the control group, DkNCED-1 was the main gene for making ABA. In the CO2 and 1-MCP/CO2 groups, DkNCED-1 and DkNCED-2 were the main genes, but 1-MCP could inhibit their expression. CO2 deastringency and 1-MCP treatments considerably enhanced and suppressed the expression of DkERF-1, respectively. Overall, CO2 deastringency and preharvest 1-MCP spraying influenced fruit respiration rate, ethylene production, total carotenoid and chlorophyll contents, and the expression of carotenoid biosynthesis genes, NCED, and ERF, thereby facilitating or delaying changes in persimmon peel color.