## 2 Results
### Correlation Analysis of Key Enzyme Gene Expression in the Ginsenoside Synthesis Pathway  
The correlation analysis results of gene expression at different growth stages are shown in Tables 5 and 6. In the roots, HMGR was significantly positively correlated (\(p<0.01\)) with FPS, but it was significantly negatively correlated (\(p<0.01\)) with DS and PPTS. SS was significantly positively correlated (\(p<0.01\)) with SE. FPS was significantly negatively correlated (\(p<0.01\)) with PPTS. DS was significantly negatively correlated (\(p<0.01\)) with \(\beta\)-AS. \(\beta\)-AS was significantly negatively correlated (\(p<0.01\)) with OAS. In the leaves, HMGR was significantly positively correlated (\(p<0.01\)) with FPS. SS was significantly positively correlated (\(p<0.01\)) with SE, PPDS, \(\beta\)-AS and OAS. SE was significantly positively correlated (\(p<0.01\)) with PPDS, \(\beta\)-AS and DS. PPDS was significantly positively correlated (\(p<0.01\)) with \(\beta\)-AS and OAS. \(\beta\)-AS was significantly positively correlated (\(p<0.01\)) with OAS. Interestingly, PPTS was negatively correlated with all genes. The expression of nine key enzyme genes in ginseng is closely related with the others. The key enzyme genes are affected by the expression of several other key enzyme genes, which indicates that the biosynthesis process of ginsenosides in different tissues is affected. Synergistic regulation of multiple key enzymes promotes the expression of key enzyme genes, regulates the metabolic flow of ginsenosides, and ultimately guides the synthesis of various individual ginsenosides. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline  & \multicolumn{3}{c}{**PPT**} & \multicolumn{6}{c}{**PPD**} & \multicolumn{2}{c}{**Ro**} & \multicolumn{2}{c}{**Total Saponins**} \\ \cline{2-11}  & **Rg1** & **Re** & **Rf** & **Rb1** & **Rc** & **Rb2** & **Rb3** & **Rd** & **Rd** & **Total Saponins** \\ \hline Rg1 & 1 & 0.98 & 0.95 & 0.98 & 0.89 \({}^{**}\) & 0.73 \({}^{*}\) & 0.99 \({}^{**}\) & 1.00 \({}^{**}\) & \(-0.95 \({}^{**}\) & 0.99 \({}^{**}\) \\ Re & 1 & \({}^{**}\) & \({}^{**}\) & \({}^{**}\) & \({}^{**}\) & 0.94 \({}^{**}\) & 0.84 \({}^{*}\) & 0.97 \({}^{**}\) & 0.99 \({}^{**}\) & \(-0.89 \({}^{**}\) & 1.00 \({}^{**}\) \\ Rf & & & 1 & 0.99 \({}^{**}\) & \({}^{**}\) & 0.89 \({}^{**}\) & 0.85 \({}^{**}\) & 0.94 \({}^{**}\) & 0.97 \({}^{**}\) & \(-0.81 \({}^{*}\) & 0.99 \({}^{**}\) \\ Rb1 & & & & 1 & 0.86 \({}^{**}\) & 0.76 \({}^{*}\) & 0.99 \({}^{**}\) & 0.99 \({}^{**}\) & \(-0.87 \({}^{**}\) & 0.99 \({}^{**}\) \\ Rc & & & & & 1 & 0.91 \({}^{**}\) & 0.84 \({}^{*}\) & 0.90 \({}^{**}\) & \(-0.83 \({}^{*}\) & 0.92 \({}^{**}\) \\ Rb2 & & & & & & 1 & 0.67 \({}^{*}\) & 0.76 \({}^{*}\) & \(-0.56\) & 0.81 \({}^{*}\) \\ Rb3 & & & & & & 1 & 0.99 \({}^{**}\) & \(-0.94 \({}^{**}\) & 0.98 \({}^{*}\) \\ Rd & & & & & & & 1 & \(-0.93 \({}^{**}\) & 0.99 \({}^{**}\) \\ Ro & & & & & & & & 1 & \(-0.89 \({}^{**}\) \\ Total & & & & & & & & & 1 & \(-0.89 \({}^{**}\) \\ spoins & & & & & & & & & & 1 \\ \hline \hline \end{tabular} \({}^{*}\) indicates a significant correlation (\(p<0.05\)). \({}^{**}\) indicates a significant correlation (\(p<0.01\)).  
\end{table} 
Table 4: Correlation analysis of individual ginsenosides and total saponins in leaves at different growth times.