The root, stem, leaf, petiole and receptacle samples stored at − 80 °C were used for total RNA extraction with a modified CTAB method [80 ].The cDNA was generated by Primerscript RT reagent Kit with gDNA Erase (Takara) according to the manufacturer’s protocol. Quantitative PCR (qPCR) was performed using SYBR Premix Ex Tag (Takara), with GAPDH as an internal reference gene [81 (link)]. Results were analyzed using the 2-ΔCT method [81 (link)]. Three biological and three technical replicates were performed and analyzed. Primers used in this study are listed in Additional file 12.
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