Effects of exogenous auxin on yield in foxtail millet (<i>Setaria italica</i> L.) when applied at the grain-filling stage.

3.2 Effects of NAA on physiological characteristics in leaves of foxtail millet The SOD activity in both millet varieties showed a trend in which it increased initially and then decreased with increasing concentrations of exogenous NAA, with a peak at 36 mg L -1 ( Figure 1A ).

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3.6 Correlation between photosynthetic characteristics and grain yield in foxtail millet As shown in Table 5 , Pn showed a highly significant positive correlation with chlorophyll content and Tr, and a significant positive correlation with Gs, Y(II), and ETR, further indicating that the enhancement of Pn by NAA is related to the improvement of both stomatal and non-stomatal factors, which in turn was closely related to the enhancement of PSII electron transfer efficiency.

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