Table I. Main photosynthetic parameters in wild-type and vyl mutant seedlings.

**P < 0.05 (very significant).

Seedling	ΦPSII	ETR	NPQ	Qp	Fv/Fm
Wild type	0.44 ± 0.02	9.20 ± 0.35	1.30 ± 0.25	0.74 ± 0.09	0.81 ± 0.01
vyl	0.14 ± 0.01**	2.87 ± 0.16**	0.15 ± 0.02**	0.19 ± 0.05**	0.78 ± 0.01