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在２５００μｍｏｌＥ／ｍ２ｓ光逆境条件下研究了扬麦１５８旗叶类囊体膜、ＰＳⅡ颗粒ＰＳⅡ光化学特性和组分的影响。电子传递活性的结果表明：该麦旗叶类囊体膜及ＰＳⅡ颗粒ＰＳⅡ放氧活性产生下降，其中ＰＳⅡ颗粒的活性下降较为明显。室温荧光发射光谱的结果表明，光逆境导致ＰＳⅡ荧光发射强度的减弱。ＰＳⅡ颗粒多肽组分中，ＯＥＣ３３ｋＤ对光逆境反应较为敏感，降解最为显著。捕光色素蛋白（ＣＰ４３ｋＤ，２８～２９ｋＤ等）也有不同浓度的降解。
The photochemical characteristics and components of PSⅡ particles in the membrane of the thylakoid membrane of Yangmai 158 were studied under light stress of 2500μmolE / m2s. The results of electron transfer activity showed that the activity of PSⅡ particles in the flag leaf thylakoid membrane and the PS Ⅱ particles decreased, and the activity of PSⅡ particles decreased obviously. Fluorescence emission spectra at room temperature showed that light stress led to the decrease of PS Ⅱ fluorescence emission intensity. Among PSⅡparticles, OEC33kD was more sensitive to light stress and had the most degradation. Light harvesting pigment protein (CP43kD, 28 ~ 29kD, etc.) also have different concentrations of degradation.