Selection of reliable reference genes for RT-qPCR during methyl jasmonate, salicylic acid and hydrogen peroxide treatments in Ganoderma lucidum.

This study aimed to identify suitable reference genes under three chemical inducers, methyl jasmonate (MeJA), salicylic acid (SA) and hydrogen peroxide (HO) in Ganoderma lucidum. In this study, expression stabilities of 14 candidate reference genes had been validated. Four algorithms were used: geNorm, NormFinder, BestKeeper, and RefFinder. Our results showed that, in short time, UCE2 (ubiquitin conjugating enzyme) was the most stable gene both in MeJA and HO treatments, ACTIN (beta-actin) was the most suitable reference gene for SA treatment. ACTIN/UCE2 were considered the most suitable genes to normalize in MeJA, SA and HO conditions. In long time, PP2A (protein phosphatase 2A regulatory subunit) was the most stable gene in MeJA and SA treatments, UCE2 was the most suitable reference gene for HO treatment. PP2A/UBQ1 (polyubiquitin 1) were considered the most suitable genes to normalize in MeJA, SA and HO conditions. Furthermore, target gene, oxidosqualene cyclase (osc), was selected to validate the most and least stable reference genes under different treatments. Our work provided a better support to study the regulatory mechanism of MeJA, SA and HO on biological functions.