Table 3. Linear models explaining the reproductive traits of Medicago truncatula as a function of inoculation conditions (inoculated or not with Pseudomonas fluorescens C7R12), CO₂ concentration (ambient, 365 ppm or enriched, 750 ppm) and the plant developmental stage (Fp and Pf, see text), excepting for the pod mass (C) which was measured in the second experimental replicate only.

Source of variation	df	Sum of Squares	F Ratio	P
(A) Number of flowers
Replicate	1	6.83	202.81	<0.0001
Inoculation [replicate]	2	0.17	2.55	0.09
CO2 [replicate]	2	2.72	40.43	<0.0001
Developmental stage [replicate]	2	2.14	31.73	<0.0001
Inoculation*CO2 [replicate]	2	0.06	0.82	0.45
Inoculation*Developmental stage [replicate]	2	0.21	3.07	0.05
CO2*Developmental stage [replicate]	2	0.63	9.36	0.0003
Inoculation*CO2*Developmental stage [replicate]	2	0.14	2.04	0.14
Error	60	2.02
(B) Number of pods
Replicate	1	0.53	8.09	0.0061
Inoculation [replicate]	2	0.09	0.67	0.52
CO2 [replicate]	2	2.49	19.03	<0.0001
Developmental stage [replicate]	2	0.97	7.39	0.0014
Inoculation*CO2 [replicate]	2	0.26	2.02	0.14
Inoculation*Developmental stage [replicate]	2	0.14	1.05	0.36
CO2*Developmental stage [replicate]	2	4.72	36.05	<0.0001
Inoculation*CO2*Developmental stage [replicate]	2	0.17	1.29	0.28
Error	60	3.93
(C) Mass of one pod
Inoculation	1	0.03	1.33	0.26
CO2	1	0.49	26.05	<0.0001
Developmental stage	1	5.81	306.18	<0.0001
Inoculation*CO2	1	0.06	2.96	0.10
Inoculation*Developmental stage	1	0.07	3.80	0.06
CO2*Developmental stage	1	0.00	0.25	0.62
Inoculation*CO2*Developmental stage	1	0.01	0.69	0.41
Error	37	6.92