It was further confirmed by a plotting with two competitive substrates.The oxidizing activity of GO towards glycerate might result in a futile cycle of NADH dissipation in photorespiration pathway.

• 结合植物光呼吸途径，推测GO氧化甘油酸这一活性可能与羟基丙酮酸还原酶共同作用，在羟基丙酮酸和甘油酸之间形成无效循环，导致植物体内主要还原力NADH的净消耗。