玉米植株叶片在水分胁迫下 ,活性氧代谢平衡失调。随着胁迫强度的增加 ,O÷2 和H2 O2 大量产生 ,导致叶绿素氧化破坏。光合受抑在中度至重度胁迫时 ,非气孔因素中活性氧伤害起主导作用。抗旱杂交种抵御活性氧伤害的能力强于干旱敏感杂交种 Maize plant leaves under water stress, reactive oxygen metabolism imbalance. With the increase of stress intensity, O ÷ 2 and H2 O2 were produced in large quantities, leading to oxidative destruction of chlorophyll. Photosynthetic depression in the moderate to severe stress, non-stomatal factors in reactive oxygen species play a leading role. Drought-tolerant hybrids are more resistant to reactive oxygen species than drought-sensitive hybrids