Validation of reference genes for real-time quantitative PCR normalisation in non-heading Chinese cabbage

Area of Science:

• Plant Molecular Biology
• Agricultural Science
• Genomics

Background:

• Non-heading Chinese cabbage is a vital vegetable crop.
• Accurate gene expression studies depend on reliable reference gene selection for normalization.
• Candidate reference genes must be validated for specific experimental contexts.

Purpose of the Study:

• To identify the most stable reference genes for quantitative real-time PCR (qRT-PCR) in Chinese cabbage under various conditions.
• To evaluate the expression stability of 13 candidate reference genes.
• To provide guidance on selecting appropriate reference genes for different experimental designs.

Main Methods:

• Assessed expression stability of 13 candidate reference genes (ACTIN, ACTIN-1, ACTIN-2, GAPDH, Tub_α, CyP, EF1-α, 18S rRNA, UBQ, UBC30, PPR, PP2A, MDH).
• Utilized geNorm and NormFinder programs for expression stability analysis.
• Analyzed gene expression across 20 samples representing four strategic groups (developmental stages, tissues, biotic stress, abiotic stress).

Main Results:

• No single reference gene exhibited uniform expression across all tested samples.
• ACTIN and CyP were stable for developmental stages.
• CyP, Tub_α, and UBC30 were suitable for different tissues.
• CyP and Tub_α showed high stability under biotic stress.
• UBC30, EF1-α, and ACTIN were recommended for abiotic stress studies.
• A combination of at least five genes (ACTIN, CyP, UBC30, EF1-α, UBQ) is necessary for comprehensive normalization.

Conclusions:

• The choice of reference genes in Chinese cabbage is highly dependent on the experimental conditions.
• Specific reference genes or combinations are recommended for developmental, tissue, biotic, and abiotic stress studies.
• Accurate qRT-PCR normalization requires careful selection and validation of multiple reference genes for robust gene expression analysis.