Fig. 2

Frequency distributions for leaf extracting chlorophyll content traits in the ZH RILs. The arrows indicate traits associated values for the two parents used to construct the RIL population (cv. ‘Zhonghuang 24’ and ‘Huaxia 3’). a the frequency distributions for leaf extracting chlorophyll content traits at soybean R1 growth stage in the summer of 2017 at Zengcheng; b the frequency distributions for leaf extracting chlorophyll content traits at soybean R4 growth stage in the summer of 2017 at Zengcheng; c the frequency distributions for leaf chlorophylls content-related traits at soybean R6 growth stage in the summer of 2017 at Zengcheng