Table 2.

Shoot/root ratio (S/R), nodule biomass (Nod; g DW), Nod per gram of host root biomass, midday water potential (Ψ; MPa), and carbon isotope values (δ ¹³C; ‰) of small (S) or large (L) U. europaeus either uninfected (minus) or infected (plus) with C. pubescens

	S/R	Nod	Nod g–1 root	Ψ	δ13C
Treatment
S–	3.09±0.319	0.487±0.057 a	0.049±0.004	−1.44±0.082	−31.6±0.223
S+	2.59±0.301	0.120±0.018 b	0.100±0.020	−1.30±0.094	−32.8±0.240
L–	2.89±0.169	0.511±0.050 a	0.039±0.003	−1.53±0.105	−31.2±0.285
L+	2.07±0.258	0.323±0.061 a	0.058±0.007	−1.62±0.105	−31.7±0.141
Infection
–	2.99±0.176 a	N/A	0.044±0.003 a	−1.48±0.056	−31.4±0.185 a
+	2.33±0.203 b	N/A	0.079±0.011 b	−1.43±0.067	−32.3±0.196 b
Size
S	2.84±0.222	N/A	0.074±0.012	−1.37±0.063 a	−32.2±0.220 a
L	2.48±0.183	N/A	0.049±0.004	−1.58±0.073 b	−31.4±0.170 b

Data are means (± 1 SE). Treatments: n=8, infection or size: n=16, and different lower case letters signify a significant difference. Significant infection×size interaction for nodule biomass, independent infection effect on S/R, Nod g^–1, root, and δ ¹³C, and significant independent size effect on Ψ and δ ¹³C.