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Enhanced Protease Inhibitor Expression in Plant Residues Slows Nitrogen Mineralization

^a Dep. of Soil, Water, & Climate, 1991 Upper Buford Circle, Room 439, Univ. of Minnesota, Saint Paul, MN 55108, USA
^b USDA-ARS Plant Sci. Res. Unit, 1991 Upper Buford Circle, Room 439, Univ. of Minnesota, Saint Paul, MN 55108, USA; K. Kumar, current address: Res. and Dev., Metropolitan Water Reclamation District of Greater Chicago, 6001 West Pershing Rd., Cicero, IL 60804-4112

View larger version (31K): [in a new window]   Fig. 1. Concentration of inorganic N in leachate during periodic leaching events (bars) and percentage N mineralized from transgenic Brassica and isogenic control plant residues (lines) for (a) residues mixed with soil and (b) residues on soil surface. Asterisks represent significant differences (P 0.05) in inorganic N concentration in leachate between transgenic and isogenic control residues. Bars represent the least significant difference (P 0.05) in cumulative residue N mineralized between transgenic Brassica and isogenic control plant residues. PI, protease inhibitor.

View larger version (26K): [in a new window]   Fig. 2. Concentration of inorganic N in leachate during periodic leaching events (bars) and percentage N mineralized from transgenic rice and isogenic control plant residues (lines) for (a) residues mixed with soil and (b) residues on soil surface. Asterisks represent significant differences (P 0.05) in inorganic N concentration in leachate between transgenic and isogenic control residues. Bars represent the least significant difference (P 0.05) in cumulative residue N mineralized between transgenic rice and isogenic control plant residues. PI, protease inhibitor.

View larger version (28K): [in a new window]   Fig. 3. Concentration of inorganic N in leachate during periodic leaching events (bars) and percentage N mineralized from transgenic tobacco and isogenic control plant residues (lines) for (a) residues mixed with soil and (b) residues on soil surface. Asterisks represent significant differences (P 0.05) in inorganic N concentration in leachate between transgenic and isogenic control residues. Bars represent the least significant difference (P 0.05) in cumulative residue N mineralized between transgenic tobacco and isogenic control plant residues. PI, protease inhibitor.