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

Univ. of Arkansas, Dep. of Crop, Soil, and Environmental Sciences, 1366 W. Altheimer Drive, Fayetteville, AR 72704

View larger version (19K): [in a new window]   Fig. 1. Relative rates of acetylene reduction activity (ARA) and root plus nodule respiration (RNR) during drought stress. Fraction transpirable-soil water (FTW) for water-deficit treatments on Day 1 through 5 were 0.60, 0.24, 0.19, 0.15, and 0.10, respectively. Error bars represent + SE (n = 4).

View larger version (24K): [in a new window]   Fig. 2. Acetylene reduction activity (ARA) vs. root plus nodule respiration (RNR). Data are from plants for the water-deficit treatments from the nodule-gas exchange experiment. The regression equation is combined over cultivars.

View larger version (17K): [in a new window]   Fig. 3. The cumulative fraction of nodules vs. nodule size for Jackson and KS4895, averaged over water treatments, in the 14C partitioning experiment. * Indicates a significant difference between cultivars at a specific cumulative nodule size as determined by least significant difference (P < 0.05).

View larger version (21K): [in a new window]   Fig. 4. Specific activity (dpm mg-1 nodules-1) of 14C in different nodule size fractions as influenced by cultivar, averaged over water treatment (A) and water treatment, averaged over cultivar (B). LSDs (P < 0.05) for Fig. 4A within and between cultivars are 14 and 20, respectively, and for Fig. 4B within and between water treatments are 13 and 18, respectively.