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园艺学报 ›› 2026, Vol. 53 ›› Issue (5): 1253-1273.doi: 10.16420/j.issn.0513-353x.2025-0194

• 遗传育种·种质资源·分子生物学 • 上一篇    下一篇

贮藏温度影响泰国青柚采后果皮失绿的比较转录组学分析

王斌1,2, 曹秋艳1,*(), 袁晓1,3, 朱云娜1,2, 黄常健1, 刘堂茂1,*()   

  1. 1 韶关学院生物与农业学院广东省粤北食药资源利用与保护重点实验室, 广东韶关 512005
    2 粤北特色果蔬工程技术研究中心韶关学院园艺工程技术研究中心, 广东韶关 512005
    3 华南农业大学园艺学院广东省果蔬保鲜重点实验室, 广州 510642
  • 收稿日期:2025-12-04 修回日期:2026-02-13 出版日期:2026-05-25 发布日期:2026-05-26
  • 通讯作者:
    * E-mail:
  • 基金资助:
    2023年度韶关市科技支撑乡村振兴项目(230612178030335)

Comparative Transcriptomic Analysis of the Effects of Storage Temperature on Peel De-greening of Postharvest Thai Green Pomelo

WANG Bin1,2, CAO Qiuyan1,*(), YUAN Xiao1,3, ZHU Yunna1,2, HUANG Changjian1, LIU Tangmao1,*()   

  1. 1 Guangdong Provincial Key Laboratory of Utilization and Conservation of Food and Medicinal Resources in Northern RegionCollege of Biology and Agriculture,Shaoguan University,Shaoguan, Guangdong 512005, China
    2 Guangdong Provincial Engineering and Technology Research Center of Special Fruit and Vegetables in Northern RegionEngineering and Technology Research Center of Shaoguan Horticulture in Shaoguan University,Shaoguan, Guangdong 512005, China
    3 Guangdong Province Key Laboratory of Postharvest Science of Fruits and VegetablesCollege of Horticulture,South China Agricultural University, Guangzhou 510642, China

摘要:

果皮色泽是影响泰国青柚(Citrus maxima)商品性的重要指标,但贮藏温度是否以及如何影响泰国青柚果皮色泽仍不清楚。将八成熟的泰国青柚果实在5、15和25 ℃下贮藏15 d,利用比较转录组学方法结合表型和生理数据,探究贮藏温度对果皮色泽的影响。结果显示,5 ℃下贮藏能延缓果皮失绿,而15和25 ℃贮藏期间果皮快速失绿。在5、15和25 ℃下贮藏15 d,果皮总叶绿素含量分别下降了21.93%、64.53%和86.74%,总黄酮含量分别增加了8.56%、27.03%和35.46%。与贮藏前(0 d)相比,5和15℃贮藏5 d产生的差异表达基因(differentially expressed genes,DEG)均显著富集在植物激素信号转导等通路中,而25 ℃贮藏5 d产生的DEG显著富集在碳代谢等通路中。与5 ℃贮藏5 d相比,15或25 ℃贮藏所产生的DEG显著富集在卟啉与叶绿素代谢、光合作用天线蛋白、苯丙烷素生物合成和异黄酮生物合成等色素合成或代谢相关途径中;上调表达的DEG也显著富集在苯丙烷素生物合成和卟啉与叶绿素代谢途径中。通过加权基因共表达网络分析发现,洋红色(magenta)模块和黄色(yellow)模块内的基因与总叶绿素含量显著负相关,而棕色(brown)模块与总叶绿素含量显著正相关。此外,还鉴定到了119个与果皮失绿进程密切相关的转录因子基因,其中MYB、ERF和bHLH家族数量最多,且与叶绿素降解相关基因的表达模式高度相关。qRT-PCR分析表明,15和25 ℃贮藏前期叶绿素代谢和黄酮合成相关基因的表达显著上调。综上,贮藏温度显著影响泰国青柚果皮失绿,5 ℃贮藏能有效延缓果皮失绿,而15和25 ℃贮藏加速果皮失绿。15和25 ℃贮藏通过影响叶绿素代谢和和黄酮合成相关基因的表达促进果皮失绿,受贮藏温度诱导的MYB、ERF和bHLH可能参与泰国青柚果皮失绿的调控。

关键词: 柚, 采后, 贮藏温度, 果皮失绿, 转录组学分析

Abstract:

The peel color is a critical indicator influencing the commercial value of Thai green pomelo(Citrus maxima)fruit. However,the effects of storage temperature on peel color alterations remain unclear. In this study,fruit at 80% maturity were stored at 5,15,and 25 ℃ for 15 d to investigate temperature-dependent peel color changes through comparative transcriptomic analyses integrated with phenotypic and physiological data. The results showed that storage temperature significantly affected the peel color of Thai green pomelos. Storage at 5 ℃ delayed the de-greening,whereas rapid changes in de-greening were occurred under 15 and 25 ℃ conditions. After 15 d of storage,the total chlorophyll contents respectively decreased by 21.93%,64.53% and 86.74% at 5,15 and 25 ℃,while total flavonoid contents increased by 8.56%,27.03% and 35.46%,respectively. Compared to pre-storage(0 d),the differentially expressed genes(DEGs)identified after 5 d of storage at 5 and 15 ℃ were significantly enriched in several pathways,plant hormone signal transduction,while DEGs from storage at 25 ℃ were significantly enriched in pathways carbon metabolism. After 5 d of storage,DEGs generated at 15 or 25 ℃ compared to those at 5 ℃ were significantly enriched in pigment biosynthesis or metabolism-related pathways,such as porphyrin and chlorophyll metabolism,photosynthetic antenna proteins,the phenylpropanoid biosynthesis,and flavonoid biosynthesis. DEGs that were upregulated were also significantly enriched in the phenylpropanoid biosynthesis and porphyrin and chlorophyll metabolism pathways,weighted gene co-expression network analysis revealed that genes in the magenta and yellow modules were negatively correlated with total chlorophyll content,while that in the brown module showed a significant positive correlation with total chlorophyll content. Furthermore,119 transcription factor genes that closely related to the process of peel de-greening were identified,with the highest numbers belonging to the MYB,ERF,and bHLH families. Additionally,strong correlations were observed between the expression of MYBERF,and bHLH transcription factor genes and genes related to chlorophyll degradation. qRT-PCR analysis indicated that storage at 15 and 25 ℃ significantly upregulated the expression of genes related to chlorophyll metabolism and flavonoid biosynthesis during the early storage period. In conclusion,storage temperature significantly affects the de-greening of Thai green pomelo peels. Storage at 5 ℃ effectively delays the de-greening,while storage at 15 and 25 ℃ accelerates that progress. 15 and 25 ℃ storage facilitated the de-greening by influencing the expression of genes associated with chlorophyll metabolism and flavonoid biosynthesis,possibly involving MYB,ERF,and bHLH transcription factors induced by these temperatures in Thai green pomelos.

Key words: pomelo, postharvest, storage temperature, peel de-greening, transcriptomic analysis