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No Evidence That Bacillus thuringiensis Genes and Their Products Influence the Susceptibility of Corn Residue to Decomposition

USDA-ARS-North Central Agricultural Research Laboratory, Brookings, SD 57006

View larger version (43K): [in this window] [in a new window]   Fig. 1. Mechanical strength of internode sections (3, 5, 7) from intact stalks of each of the four corn hybrids: (i) CL344 (Conventional, base genetics), (ii) CL344CRW/Bt (containing genes for both Cry1Ab and Cry3Bb1 proteins), (iii) DKC46–25 (YieldGuard Plus containing genes for both Cry1Ab and Cry3Bb1 proteins), and (iv) DKC46–26 (Conventional, base genetics); different letters denote values that are significantly different (P < 0.05, least-significant difference test). (a) Flexural strength (MPa); (b) Modulus of Elasticity.

View larger version (15K): [in this window] [in a new window]   Fig. 2. Percent residue remaining in litter bags (average of n = 10) after intervals of 73, 160, and 384 d for each of four corn hybrids: (i) CL344 (Conventional, base genetics), squares; (ii) CL344CRW/Bt (containing genes for both Cry1AB and Cry3Bb1 proteins), triangles; (iii) DKC46-26 (Conventional, base genetics), diamonds; and (iv) DKC46-25 (YieldGuard Plus containing genes for both Cry1Ab and Cry3Bb1 proteins), circles. The hybrids of residues buried in the root zones of non-Bt (CL344) corn are indicated with dashed lines and open symbols and those buried in Bt (CL344CRW/Bt) corn are indicated with solid lines and closed symbols. Error bars were removed for clarity of presentation.

View larger version (39K): [in this window] [in a new window]   Fig. 3. Percent of cellulose filter remaining after 29, 51, and 74 d during the growth (G) phase of the corn hybrids CL344 and CL344CRW/Bt and after 49 and 65 d during the senescent (S) phase of the same. Each bar represents an average of filters collected from n = 11 plants with one standard error.