Changes in the chlorophyll fluorescence parameters Fv/Fm (A) and Φ
(B) in flag leaves and exposed peduncles at different stages. Each data point in the figure represents the average and the standard deviation of at least 10 individually selected and analysed leaves. F
: maximum PSII quantum yield; ΦPSII: effective PSII quantum yield. Stages 1-5 correspond (respectively) to the end of anthesis, the milk-development stage, the soft dough-development stage, the hard dough-development stage and the ripening stage.