Increased nitrogen fixation and remobilization may increase seed protein without a yield penalty in a soybean introgression line
2021
Locke, Anna M. | Ramirez, Martha E.
Development of soybean [Glycine max (L.) Merr.] varieties with high seed protein concentration are hindered by a negative correlation between seed protein and yield. “Benning HP,” a genotype that breaks this tradeoff, contains an introgressed high-protein allele. Field and growth chamber experiments were conducted to identify N flux(es) that enable Benning HP’s increased seed protein without a yield penalty. When the N source was completely controlled, Benning HP could fix more N than its recurrent parent, but this depended on the rhizobium strain and plant developmental stage. In the field, Benning HP remobilized N from its leaves at a higher rate than its recurrent parent during seed fill in only one of the years studied. These results demonstrate that Benning HP has higher potential N fixation and N remobilization from vegetative tissue compared to its lower protein parent, but the expression of those traits may depend on environment and sink control.
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