Table 1.

Changes in the PSII amount during different phases of S deprivation in WT and Stm6 mutant cells of C. reinhardtii

	Tyrosine D• (%)*
Phase in S deprivation	WT	Stm6
Control	100	100
O2-evolving phase (I)	54	102
O2 consumption phase (II)	25	102
Anaerobic phase (III)	22	98
H2 production phase (IV)	23	52

PSII content was estimated from measurements of tyrosine D^•.

^*Data are normalized on the basis of the Chl content in the respective sample as described in ref. 28 (Material and Methods).