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<p>Sweet cherries are highly perishable, and Modified Atmosphere Packaging (MAP) is commonly used to extend their shelf life by altering gas composition. This study investigates the influence of fruit size at different temperatures on the respiration rate (<i>RR</i>) of ‘Coral Champagne,’ ‘Chelan,’ ‘Skeena,’ and ‘Sweetheart’ cherries. Cherries were obtained in 2023 and evaluated at 4&#xa0;°C and 23&#xa0;°C for two size categories — Big (24–27&#xa0;mm) and Small (21–24&#xa0;mm). Additionally, ‘Sweetheart’ cherries were classified by 9, 10, 11, and 12 row sizes, with measurements of surface area and flesh weight. Results show a positive correlation between temperature and <i>RR</i>, with smaller fruits exhibiting consistently higher respiration across cultivars. Significant (<i>p value</i> &lt; 0.05) differences in surface area and flesh weight were observed in ‘Sweetheart’ across sizes. At 23&#xa0;°C, 11 row cherries displayed the highest <i>RR</i>. A size factor (<i>ψ</i>) was introduced to quantify the balance between stomatal density (surface area) and carbon substrate availability (flesh weight). The maximum <i>RR</i> occurred when <i>ψ</i> approached 1. Respiration Quotient (<i>RQ</i>) remained stable at lower temperatures but showed greater variance at higher temperatures. This study highlights the critical role of fruit size in determining respiration rates and informs MAP strategies for extending sweet cherry freshness.</p>

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Influence of fruit size on sweet cherry respiration: a multi-cultivar analysis introducing the size factor

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Smit Patel,
  • Carolina A. Torres,
  • Juming Tang,
  • Shyam Sablani,
  • Charles L. Munson

摘要

Sweet cherries are highly perishable, and Modified Atmosphere Packaging (MAP) is commonly used to extend their shelf life by altering gas composition. This study investigates the influence of fruit size at different temperatures on the respiration rate (RR) of ‘Coral Champagne,’ ‘Chelan,’ ‘Skeena,’ and ‘Sweetheart’ cherries. Cherries were obtained in 2023 and evaluated at 4 °C and 23 °C for two size categories — Big (24–27 mm) and Small (21–24 mm). Additionally, ‘Sweetheart’ cherries were classified by 9, 10, 11, and 12 row sizes, with measurements of surface area and flesh weight. Results show a positive correlation between temperature and RR, with smaller fruits exhibiting consistently higher respiration across cultivars. Significant (p value < 0.05) differences in surface area and flesh weight were observed in ‘Sweetheart’ across sizes. At 23 °C, 11 row cherries displayed the highest RR. A size factor (ψ) was introduced to quantify the balance between stomatal density (surface area) and carbon substrate availability (flesh weight). The maximum RR occurred when ψ approached 1. Respiration Quotient (RQ) remained stable at lower temperatures but showed greater variance at higher temperatures. This study highlights the critical role of fruit size in determining respiration rates and informs MAP strategies for extending sweet cherry freshness.