Table I. Rate of starch synthesis and degradation calculated as the difference between the maximal and minimal starch concentration divided by the length of the period in h.

The plants were grown under sd at a PFD of 30 versus 150 μ mol quanta m⁻² s⁻¹. Values represent the mean ± se of four replicates of eight plants each. Those that are significantly different from the respective wild type (wt) as determined by the Student's t test (P < 0.05) are printed in bold.

Genotype	Rate of Synthesis		Rate of Degradation
	30 PFD	150 PFD	30 PFD	150 PFD
	μ mol Glc g fresh weight−1¹ h−1
wt	0.663 ± 0.058	3.176 ± 0.379	0.331 ± 0.029	1.588 ± 0.189
MEm2	0.919 ± 0.059	3.349 ± 0.261	0.460 ± 0.029	1.884 ± 0.147
MEm5	1.050 ± 0.063	3.061 ± 0.096	0.525 ± 0.031	1.722 ± 0.054