TABLE 4.

Bacterial populations of 30-84 and its derivatives recovered from the wheat rhizosphere^a

Strain	Genotype	Log CFU/g of rootsb
		Pasteurized soil	Natural soil
30-84	Wild type	7.68 ± 0.27 A	7.14 ± 0.26 A
30-84I	phzI::npt	7.60 ± 0.25 A	6.42 ± 0.23 B
30-84R	phzR::Tn5lacZ	7.54 ± 0.26 A	6.32 ± 0.23 B
30-84I2	csaI::uidA-Gm	7.54 ± 0.24 A	6.20 ± 0.29 B
30-84R2	csaR::uidA-Gm	7.63 ± 0.21 A	6.89 ± 0.28 A
30-84I/I2	phzI::npt csaI::uidA-Gm	6.98 ± 0.29 B	5.44 ± 0.28 C
30-84R/R2	phzR::Tn5lacZ csaR::uidA-Gm	6.94 ± 0.30 B	5.46 ± 0.23 C

^aPregerminated wheat seeds were treated with a bacterial suspension and sown in potting mix containing pasteurized or natural soil contained in plastic cones. The cones were placed in a growth chamber. Twenty days after emergence, root samples were collected and bacteria were isolated. 

^bAll values are means ± standard deviations of two experiments, with four replicates per experiment. Values followed by the same letter in each column are not significantly different (P = 0.05).