Table I.

Respiration rates and ¹⁸O-discrimination values of whole soybean root respiration, first in the absence of inhibitors and then in the presence of KCN or SHAM in 4-, 7-, and 17-d-old roots

Parameter	d 4	d 7	d 17
Respiration rate	μmol O2 min−1 g−1 dry mass
Control	4.05  ± 0.40	3.8  ± 0.50	1.55  ± 0.14
+KCN	2.70  ± 0.35	2.60  ± 0.30	1.07  ± 0.09
+SHAM	3.80  ± 0.35	2.40  ± 0.10	0.87  ± 0.13
D 18O fractionation
Control	16.4  ± 0.07	19.1  ± 0.45	20.5  ± 0.40
+KCN	24.5  ± 1.0	24.6  ± 0.85	24.2  ± 0.09
+SHAM	16.0  ± 0.25	16.3  ± 0.10	16.2  ± 0.03

Data are means ± se (n = 3).