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In order to assess its response to the herbicide, sethoxydim (SEY), seedlings of two foxtail millet () hybrids were exposed to 0.75, 1.5, 3, and 6 L(SEY active ingredient, ai) ha for 7 and 15 d. Our results showed that SEY reduced photosynthesis and oxidative stress in the hybrid millet (Zhangza) at the dosage below 1.5 L(ai) ha (, recommended dosage), whereas it caused death of Jingu 21 at all treatment dosages. In addition, we further explored the effect of SEY on PSI and PSII; the hybrid millet showed a greater tolerance to SEY and also the ability to recover. In conclusion, the hybrid millet seems to possess certain photosynthetic protection mechanisms which could reduce or eliminate the herbicide stress by increasing nonphotochemical quenching for dissipating excessive light energy under SEY-induced oxidative stress.

Photochemical changes and oxidative damage in four foxtail millet varieties following exposure to sethoxydim