《Table 2 Effects of different concentrations of ZJ0273 on Fv/Fm, ФPSII, and NPQ in PSII at the fourt

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《除草剂丙酯草醚对大麦的影响和支链氨基酸对其生长的恢复作用（英文）》

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Within a column，means at the same DAT followed by the same letters are not significantly different by the LSD test at P≤0.05 under completely randomized design.Data were analyzed separately at each measurement time.DAT:days after treatment；Fv/Fm:maximal

Increasing ZJ0237 rates of application significantly reduced maximal photochemical efficiency（Fv/Fm）of barley leaves at 1 DAT，and this reduction grew in the subsequent measurements（1–9 DAT；Table 2）.The maximum reduction in Fv/Fm was observed in response to 1000 mg/L ZJ0273，which caused a 14.1%reduction（compared with controls）in Fv/Fm at 9 DAT.Changes in leafФPSII in response to ZJ0237 application followed a similar pattern to that of Fv/Fm.Although 100 mg/L ZJ0273 had no significant effect onФPSII at 1 DAT，a steep reduction inleafФPSII was recorded under 1000 mg/L ZJ0273 with increasing application period.For example，ФPSII was reduced by 13.6%at 1 DAT and by 46.4%at 9 DAT（compared with controls）.In contrast to Fv/Fm，a significant increase in NPQ of barley leaves was observed in response to increasing the ZJ0237 application rate or the time after treatment，although the lower herbicide concentration（100 mg/L）had no significant effect on NPQ at 1 DAT.The 1000 mg/L ZJ0273 treatment increased NPQ by 72.8%at 1 DAT and by 124.4%at 9 DAT，compared with controls.No significant differences in the NPQ of the plants were detected between treatments of 500 or 1000 mg/L of ZJ0237 when measured at 5–9 DAT（Table 2）.