This experiment was designed to evaluate the effects of two
carriers (RCC and peat2), either alone or in combination with
B. amyloliquefaciens QL-18, on the survival of R. solanacearum QLRs1115
in soil. Plastic bottles were used as vessels, and the soil
used in the experiment was collected from a tomato field in the
town of Qilin. The soil was air-dried and sieved through a 1-mm
silver sieve. Six treatments were included: (1) in CK, the soil was
not amended with a carrier or B. amyloliquefaciens QL-18; (2) in
RCC, the soil was amended with RCC but not B. amyloliquefaciens
QL-18; (3) in peat2, the soil was amended with peat2 without
B. amyloliquefaciens QL-18; (4) in QL-18, the soil was inoculated
with a B. amyloliquefaciens QL-18 suspension without a carrier
amendment; (5) in RCC þ QL-18, the soil was amended with both
RCC and the B. amyloliquefaciens QL-18 suspension; and (6) in
peat þ QL-18, the soil was amended with both peat2 and the
B. amyloliquefaciens QL-18 suspension. For each treatment, the
carrier was mixed to homogeneity with 300 g of soil at a ratio of
1:100 (w/w). Ten milliliters of a B. amyloliquefaciens QL-18 suspension
(3.0 109 CFU mL1 in 0.01 mol L1 phosphate buffer, as
determined by the plate count method with LB medium) was
mixed with the soil in each microcosm according to the experimental
design. All treatments were inoculated with 10 mL of a QLRs1115
suspension (4.2 109 CFU mL1 in 0.01 mol L1 phosphate
buffer, as determined by the plate count method with CPG medium).
The water content of the soil was adjusted to 35% with
sterilized water. The microcosms were maintained at 25 C in a
dark chamber. Each treatment consisted of three replicates (three
bottles), and the soil was periodically sampled from each bottle.
The number of viable cells of R. solanacearum QL-Rs1115 and
B. amyloliquefaciens QL-18 in the soil was estimated by plating 10-
fold serial dilutions on a modified semi-selective medium, South
Africa (SMSA-E) (French et al., 1995) and salt-V8 plates,
respectively.
This experiment was designed to evaluate the effects of twocarriers (RCC and peat2), either alone or in combination withB. amyloliquefaciens QL-18, on the survival of R. solanacearum QLRs1115in soil. Plastic bottles were used as vessels, and the soilused in the experiment was collected from a tomato field in thetown of Qilin. The soil was air-dried and sieved through a 1-mmsilver sieve. Six treatments were included: (1) in CK, the soil wasnot amended with a carrier or B. amyloliquefaciens QL-18; (2) inRCC, the soil was amended with RCC but not B. amyloliquefaciensQL-18; (3) in peat2, the soil was amended with peat2 withoutB. amyloliquefaciens QL-18; (4) in QL-18, the soil was inoculatedwith a B. amyloliquefaciens QL-18 suspension without a carrieramendment; (5) in RCC þ QL-18, the soil was amended with bothRCC and the B. amyloliquefaciens QL-18 suspension; and (6) inpeat þ QL-18, the soil was amended with both peat2 and theB. amyloliquefaciens QL-18 suspension. For each treatment, thecarrier was mixed to homogeneity with 300 g of soil at a ratio of1:100 (w/w). Ten milliliters of a B. amyloliquefaciens QL-18 suspension(3.0 109 CFU mL1 in 0.01 mol L1 phosphate buffer, asdetermined by the plate count method with LB medium) wasmixed with the soil in each microcosm according to the experimentaldesign. All treatments were inoculated with 10 mL of a QLRs1115suspension (4.2 109 CFU mL1 in 0.01 mol L1 phosphatebuffer, as determined by the plate count method with CPG medium).The water content of the soil was adjusted to 35% withsterilized water. The microcosms were maintained at 25 C in adark chamber. Each treatment consisted of three replicates (threebottles), and the soil was periodically sampled from each bottle.The number of viable cells of R. solanacearum QL-Rs1115 andB. amyloliquefaciens QL-18 in the soil was estimated by plating 10-fold serial dilutions on a modified semi-selective medium, SouthAfrica (SMSA-E) (French et al., 1995) and salt-V8 plates,respectively.
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