Spatial differences in soybean bioactive components across China and their influence by weather factors
Song, Wenwen | Yang, Ruping | Yang, Xiushi | Sun, Shi | Mentreddy, Srinivasa Rao | Jiang, Bingjun | Wu, Tingting | Tian, Shiyan | Sapey, Enoch | Wu, Cunxiang | Hou, Wensheng | Ren, Guixing | Han, Tianfu
Bioactive components are partially responsible for the nutritional and health benefits of soybeans. Four major bioactive components: isoflavones, oligosaccharides, phospholipids, and saponins, were quantified in 763 soybean samples collected from widely distributed regions across China from 2010 to 2013. A majority of the tested bioactive components showed generally declining trends from the north (high latitude) to the south (low latitude). A positive relationship between total oligosaccharides (TO) and altitude was observed. Total isoflavones (TI), phospholipids (TP) and TO were negatively correlated with cumulative temperature above or equal to 15 °C (AT15) and mean daily temperature (MDT), but positively correlated with diurnal temperature range (DTR) and hours of sunshine (HS). Total saponins (TS) were negatively correlated with MDT but positively correlated with rainfall (RF), whereas TO were negatively correlated with RF. Path-coefficient analysis showed that, besides genotype differences, temperature and HS during the reproductive period influenced TI and TP contents, while temperature and RF influenced TS and TO. The effects of weather factors on soybean bioactive components in diverse regions of China were characterized. These findings will be helpful in promoting soybean production for functional food purposes.
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