Table II.

Carbon partitioning into starch and Suc after a 10-min pulse and a 10-min chase

Plant	Growth Light	Measuring CO2	Net CO2 Uptake (A)	Total 14C Fixed	Starch	Suc	Ratio of Starch/Suc
		Pa	μmol C m−2 s−1
WT	HL	31	17.4  ± 1.2	18.3  ± 1.1	6.3  ± 1.4	8.6  ± 0.6	0.73
TL46	HL	31	15.3  ± 0.6	16.6  ± 1.0	5.2  ± 0.3	7.8  ± 0.5	0.67
TL25	HL	31	14.4  ± 0.3	N.D.a	1.6  ± 0.5	10.2  ± 0.1	0.16
WT	HL	80	33.4  ± 0.9	31.3  ± 1.7	18.6  ± 2.6	9.7  ± 0.7	1.92
TL46	HL	80	23.9  ± 1.0	24.9  ± 2.7	7.5  ± 2.0	13.8  ± 0.6	0.54
TL25	HL	80	15.8  ± 1.4	N.D.	2.6  ± 0.9	11.0  ± 0.1	0.24
WT	LL	31	10.6  ± 0.3	11.8  ± 0.7	4.8  ± 0.3	3.2  ± 0.4	1.50
TL46	LL	31	9.6  ± 0.1	10.5  ± 0.5	3.0  ± 0.2	3.8  ± 0.2	0.79
WT	LL	80	23.9  ± 4.2	22.4  ± 2.5	11.8  ± 1.0	6.6  ± 0.9	1.79
TL46	LL	80	11.4  ± 2.1	13.1  ± 0.1	3.6  ± 0.8	7.0  ± 0.5	0.51

¹⁴CO₂ feeding was conducted under a PPFD of 800 μmol m⁻² s⁻¹ at a leaf temperature of 25°C. Plants were assayed near initiation of bolting; the average age was 31 and 36 d for plants grown under a PPFD of 350 and 100 μmol m⁻² s⁻¹, respectively; n = 2. WT, Wild type; HL, high light; LL, low light.

^aN.D., Not determined.