Figure 4

Effects of different treatments on chlorophyll fluorescence of tomato seedlings. (A) NPQ, (B) qP, (C) Fv/Fm, (D) ΦPSII, NA, 5 mg·kg−1 NA; KF, 60 mg·kg−1 KF; NA + KF, 5 mg·kg−1 NA and 60 mg·kg−1 KF. Different lowercase letters denote statistical differences among treatments of tomato seedlings at the 5% level according to LSD test. Error bars above mean indicate standard error (n = 3).