TABLE 2.

Effect of insertion site on environmental fitness of P. fluorescens SBW25 variants in the rhizosphere of spring wheat^a

No. of days after planting	% and logit %a
	SBW25-6K	SBW25EeK
0	40.7 (0.03) a	52.9 (0.12) ab
7	44.9 (−0.33) a	32.3 (−0.82) a
14	59.1 (0.56) ab	70.5 (0.95) b
21	86.2 (1.71) bc	67.8 (0.80) ab
28	76.5 (1.39) bc	86.6 (3.61) c
35	58.3 (0.09) a	60.9 (0.64) ab

^aSBW25 variants were applied to spring wheat as a seed coating at the time of planting (n = 5). Data are expressed as the percentage of SBW25-6K or SBW25EeK variants (logit transformed data in parentheses) in a population containing initially equal proportions of SBW25EeZY-6KX variants (lacZY xylE aph-1) and SBW25-6K (aph-1 at the -6- site) or equal proportions of SBW25EeZY-6KX and SBW25EeK (aph-1 at the Ee site). Significant (P < 0.05) differences between two treatments were obtained by LSD analyses and are indicated by different letters. The overall significance for SBW25-6K was <0.01, and that for SBW25EeK was <0.001.