# Test Trials and Analysis of Pod-Shattering Characteristics of Harvested Rapeseed Silique
## 3 Results and Analysis
### Influence of Morphological Characteristics of Rapeseed Silique on Silique Shattering
#### 3.3.2 Grey Correlation Analysis between Silique Shattering with Silique Morphological Characters  
In order to further investigate the correlation between the silique morphological characteristics and whether or not the siliques were shattered, grey correlation analysis was carried out using IBM SPSS 20 software for seven morphological parameters of the silique (length of the silique/mm, length of the beak/mm, width of the middle part of the silique/mm, thickness of the middle part of the silique/mm, thickness of the pericarp/mm, diameter of the silique stalk/mm, and the angle of the silique stalk to the silique/\({}^{\circ}\)), as well as for the data of 90 experiments. The correlation between the seven morphological parameters and shattering was also investigated by considering whether the siliques were shattered or not as the \"reference value\" (parent series). When using grey correlation analysis, the resolution coefficient was taken as 0.5, the value of the correlation coefficient was calculated by combining it with the formula of the correlation coefficient, and finally, the value of correlation was calculated, and the results of the analysis are shown in Table 15.  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Characteristic**} & \multirow{2}{*}{\begin{tabular}{c} **Length/** \\ **mm** \\ \end{tabular} } & \begin{tabular}{c} **Beak** \\ **Length/** \\ **mm** \\ \end{tabular} & \begin{tabular}{c} **Width/** \\ **mm** \\ \end{tabular} & \begin{tabular}{c} **Thick-** \\ **ms/** \\ \end{tabular} & \
\begin{tabular}{c} **Pericarp** \\ **Thick-** \\ **ness/mm** \\ \end{tabular} &
\begin{tabular}{c} **Diameter of** \\ **Amppoo-** \\ **dium/mm** \\ \end{tabular} & **Angle** & **Shattering** \\ \hline Silique length (mm) & 1 & & & & & & & \\ Beak length (mm) & 0.296 \({}^{**}\) & 1 & & & & & & \\ Silique width (mm) & 0.346 \({}^{**}\) & \(-\)0.135 & 1 & & & & & \\ Silique thickness (mm) & \(-\)0.024 & 0.220 \({}^{*}\) & 0.377 \({}^{**}\) & 1 & & & & \\ Petal thickness (mm) & \(-\)0.071 & 0.186 & 0.244 \({}^{*}\) & 0.784 \({}^{**}\) & 1 & & & \\ Diameter of & 0.232 \({}^{*}\) & 0.135 & 0.576 \({}^{**}\) & 0.587 \({}^{**}\) & 0.456 \({}^{**}\) & 1 & & \\ \multicolumn{2}{c}{Angle between} & & & & & & & \\ carpopodium and silique & 0.139 & 0.1 & 0.092 & \(-\)0.038 & \(-\)0.013 & 0.168 & 1 & \\ \multicolumn{2}{c}{Shattering} & 0.07 & 0.226 \({}^{*}\) & 0.15 & 0.197 & 0.19 & 0.594 \({}^{**}\) & \(-\)0.068 & 1 \\ \hline \hline \end{tabular} Note: \({}^{*}\) and \({}^{**}\) indicate significant correlation at 0.05 level (two-tailed) and highly significant correlation at 0.01 level (two-tailed), respectively.  
\end{table}
Table 14: Correlation analysis between shattering and morphological characters.  
Using grey correlation analysis, it was concluded that the influence of silique morphological characteristics on the silique shattering situation was in the following order: the angle of the silique stalk to the silique > carpopodium diameter > pericarp thickness > beak length > silique thickness > silique broad surface > silique length. The morphological characteristics of rapeseed siliques can be used as the appearance index for screening shatter-resistant rapeseed and provide a certain reference for selecting and breeding rapeseed varieties with strong shatter resistance to machine harvesting.