Figure 1.

Correlation analysis of the investigated traits. (A) Correlations of studied traits under low nitrogen stress. Frequency distribution for each trait was displayed on the diagonal. The upper and lower parts represent the correlation coefficient and scatter plots between two diagonal traits, respectively. (B) Correlations of each investigated trait between control and low nitrogen stress. Red and blue indicate positive and negative correlations, respectively. ***, ** and * denote significance at the 0.1%, 1% and 5% levels of probability, respectively.