According to phenotypic measurement, 10 samples with the highest and the lowest values of each trait were selected for quantitative analysis. Primer pairs were designed for six genes, AP2/ERF, TLP, PUP9, SLP, HSP, and OCT1. The cDNA was amplified according to the Takara rr820a kit (Takara, Shiga, Japan), and the expression levels of the genes were calculated using the 2-ΔΔCt method [39 (link)]. The UBI [40 (link)] gene was used to normalize the transcript profiles.
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