Soybean Nodule Size and Relationship to Nitrogen Fixation Response to Water Deficit

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Carbon cost of plant nitrogen acquisition: A mechanistic, globally applicable model of plant nitrogen uptake, retranslocation, and fixation (2010, background): “and many plants have nodules that are inactive [Kiers et al., 2003; King and Purcell, 2001; Laws and Graves, 2005; Newcomb and Tandon, 1981].”
General mechanisms of drought response and their application in drought resistance improvement in plants (2014, background): “Improved symbiotic nitrogen (N2) fixation was evidenced with effect in increasing the soybean yield by enhancing dry-matter accumulation under drought [216].”
Field Phenotyping of Soybean Roots for Drought Stress Tolerance (2014, background): “Large nodules have a greater phloem supply of carbohydrates and water than smaller nodules [34,35].”
Drought stress induced changes in some organic substances in nodules and other plant parts of two potential legumes differing in salt tolerance (2005, result): “Similar results due to water deficit have earlier been reported in common bean (Sangakkara, 1994; Upreti and Murti, 1999), and soybean (King and Purcell, 2001).”