Photosynthetica 2016, 54(1):81-86 | DOI: 10.1007/s11099-015-0160-z

Relationship between root vigour, photosynthesis and biomass in soybean cultivars during 87 years of genetic improvement in the northern China

X. Cui1, Y. Dong1, P. Gi1, H. Wang1, K. Xu1, Z. Zhang1,*
1 Department of Agronomy, Jilin Agricultural University, Changchun, Jilin Province, China

During the last century, the world soybean yield has been constantly enhancing at a remarkable rate. Factors limiting the soybean yield may be multiple. It is widely acknowledged that changes of root metabolism can influence aboveground characteristics, such as the seed yield and photosynthesis. In this study, we considered root bleeding sap mass (BSM) and root activity (RA) as indicators of the root growth vigour. We used 27 soybean cultivars, spanning from 1923 to 2009, to evaluate the contribution of root characteristic improvement to efficient photosynthesis and dry matter production. The BSM, RA, net photosynthetic rate (P N), and organ biomass were measured at different growth stages, such as the fourth leaf node, flowering, podding, and seed-filling stage. Our results showed that the soybean cultivars increased their biomass and P N thanks to genetic improvement. At the same time, BSM and RA also increased in dependence on a year of cultivar release. However, both P N and biomass were positively correlated with root characteristics only at the podding stage. Our data revealed that the improved root characteristic may have contributed to the enhanced photosynthesis, biomass, and yield of soybean cultivars during last 87 years of genetic improvement. We suggest that BSM and RA could be used as important indexes for further practice in soybean production improvement.

Keywords: breeding; gas exchange; Glycine max; root biomass

Received: August 31, 2014; Accepted: May 29, 2015; Published: March 1, 2016Show citation

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Cui, X., Dong, Y., Gi, P., Wang, H., Xu, K., & Zhang, Z. (2016). Relationship between root vigour, photosynthesis and biomass in soybean cultivars during 87 years of genetic improvement in the northern China. Photosynthetica, 54(1), 81-86. doi: 10.1007/s11099-015-0160-z.
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