Table II.

Redox poise of extracted Q from soybean roots of various ages (4, 7, or 17 d old), untreated or treated with respiratory inhibitors (1 mm KCN + 20 mm SHAM) or by freeze-thawing

Treatment	Q Reduced
	4 d	7 d	17 d
	%
Control	56  ± 3.5	53  ± 3.5	62  ± 5.5
+KCN +SHAM	76  ± 1.5	79  ± 5.0
Freeze-thawed	6  ± 4.5	10  ± 4	8  ± 3

Numbers are means ± se (n = 3–6).