Time-Series Transcriptome of Cucumis melo Reveals Extensive Transcriptomic Differences with Different Maturity

Area of Science:

• Plant Science
• Molecular Biology
• Agricultural Science

Background:

• Hami melon (Cucumis melo) is a vital crop in China, with fruit quality highly dependent on harvest maturity.
• Melons harvested at 60% maturity typically have poor quality, while 90% maturity yields the highest quality.

Purpose of the Study:

• To elucidate the genetic underpinnings of metabolite accumulation differences between 60% and 90% maturity Hami melons.
• To identify key genes and regulatory mechanisms influencing Hami melon quality at different maturity stages.

Main Methods:

• Systematic transcriptome analysis of 36 Hami melon samples at 60% and 90% maturity.
• High-throughput sequencing generating over 1.7 billion reads.
• Differential gene expression and splicing analysis.

Main Results:

• Identified differentially expressed genes (DEGs) between maturity stages, with hundreds enriched in sucrose and citric acid metabolism.
• Detected distinct splicing events correlating with maturity.
• Highlighted specific genes (e.g., CmCIN2, CmSPS2, CmBGAL3) showing differential expression or splicing related to metabolite accumulation.

Conclusions:

• Transcriptome regulation, including differential gene expression and splicing, significantly contributes to the distinct metabolite profiles and quality differences observed in Hami melons at 60% versus 90% maturity.
• Understanding these molecular mechanisms can inform optimal harvesting strategies for improved Hami melon quality.