We studied the role of H₂O₂ in the protection of photosynthesis from arsenic (As) damage in rice (Oryza sativa L.) by examining the antioxidant system, photosynthesis, and growth attributes. Among the As concentrations (0, 20, 30, 40 and 50 μM) tested, maximum oxidative stress and inhibition in photosynthesis and growth were found with 50 μM As. The application of 50 μM H₂O₂ resulted in alleviation of the adverse effects of 50 μM As on Pigment System (PS) II activity, photosynthesis, and growth. Hydrogen peroxide supplementation induced the activity of superoxide dismutase (SOD), ascorbate peroxidase (APX) and glutathione reductase (GR) and increased reduced glutathione (GSH) content and proline metabolism. The expression of SOD and APX, PSBA and PSBB was induced in the presence of H₂O₂ to alleviate the As damage to PS II and maintain photosynthetic activity. The role of H₂O₂ as a signaling molecule is shown in the protection of photosynthetic activity in rice from As toxicity through regulation on the activity and the expression of antioxidant enzymes.

我们研究H的作用₂ Ø ₂光合作用从砷（As）损伤水稻（保护水稻通过检查抗氧化系统，光合作用和生长属性L.）。在测试的砷浓度（0、20、30、40和50μM）中，使用50μMAs可以发现最大的氧化应激以及对光合作用和生长的抑制作用。50μMH ₂ O _2的应用可减轻50μMAs对色素系统（PS）II活性，光合作用和生长的不利影响。补充过氧化氢诱导了超氧化物歧化酶（SOD），抗坏血酸过氧化物酶（APX）和谷胱甘肽还原酶（GR）的活性，并增加了谷胱甘肽（GSH）含量和脯氨酸代谢的减少。在H ₂ O ₂存在下诱导SOD和APX，PSBA和PSBB的表达，以减轻As对PS II的破坏并维持光合作用。通过调节活性和抗氧化酶的表达，H ₂ O ₂作为信号分子的作用在保护水稻的光合作用免受As毒性方面显示出来。