. 2010 Apr 2;61(9):2281–2291. doi: 10.1093/jxb/erq055

Table 2.

CO₂ release and O₂ consumption of roots and nodules per fixed N and apparent root/nodule respiratory coefficient in experiment two

Parameter	Unit	Time of measurement
Parameter	Unit	Vegetative growth 23–24 DAE	Pod formation 41–42 DAE
CO₂ release of nodulated roots per N fixed	mol CO₂ mol⁻¹ N	9.1	9.6
Net CO₂ release of nodulated roots	nmol CO₂ mg dm⁻¹ h⁻¹	253.4	152.1*
O₂ uptake of nodulated roots per N fixed	mol O₂ mol⁻¹ N	10.6	15.4*
Apparent respiratory quotient of nodulated roots	mol CO₂ mol⁻¹ O₂	0.86	0.62*

N₂ fixation was calculated from H₂ evolution (ANA and TNA) according to Schulze et al. (2006). Data are means of four replicates. An asterisk indicates a statistically significant difference compared to the measurement at vegetative growth (t test, P ≤0.05).