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Sensitivity of N₂ Fixation Traits in Soybean Cultivar Jackson to Manganese

USDA-ARS, Agronomy Dep., Agronomy Physiology Lab., IFAS Building 350, 2005 SW 23rd Street, Univ. of Florida, P.O. Box110965, Gainesville, FL 32611-0965 USA

View larger version (17K): [in a new window]   Fig. 1. Effect of ureide application (400 mL of 5 mM allantoic acid solution at time 0) on ARA of 5-wk-old Biloxi and Jackson soybean plants grown hydroponically on 0 µM Mn nutrition (Exp. 1). Data were double normalized, first by dividing each individual datum by the daily mean ARA of plants grown at 6.6 µM Mn and not treated by ureide, and then dividing the normalized data by the average of normalized data at 0 d. Values are the means of four replicates and bars on each point represent standard errors of the mean.

View larger version (20K): [in a new window]   Fig. 2. Relation between normalized ARA measured 5 d after ureide treatment and leaf Mn concentration (µg g-1 DW). The plants of Biloxi (A) and Jackson (B) were 5 wk old and grown hydroponically under various Mn nutrition levels in Exp. 1 and 2. The equation of the regression for Biloxi was y = 0.46 + 0.00086 x [Mn], R2 = 0.29 (P < 0.01). The slope of the regression equation for Jackson was not significantly different from 0 (P < 0.05).

View larger version (22K): [in a new window]   Fig. 3. Effect of ureide application (400 mL of 5 mM allantoic acid solution at day 0) on the leaf ureide concentration of 4-wk-old Biloxi and Jackson soybean plants grown hydroponically with 0 or 6.6 µM Mn (Exp. 2). Values are means of four replicates per Mn x ureide treatment and bars on each point are standard errors of the mean.