photochemical efficiency

The results showed that the actual photochemical efficiency of PS ⅱ reaction center(Ф PS ⅱ) was decreased with leaf water stress aggravated, while was increased by nitrogen supply.

结果表明，PSⅡ反应中心的实际光化学效率（ФPSⅡ）随叶片水分胁迫的加剧而降低，施氮可明显提高ФPSⅡ。

It indicated that, with increasing the degree of shade, the photochemical efficiency and the potential activity of light reaction center ( PS ⅱ) in soybean, mung bean and pepper increased.

说明随着遮荫程度的提高，大豆、绿豆和辣椒光反应中心PSⅡ的光化学效率和潜在活性逐渐上升。

The content of photosynthetic pigments, PS II photochemical efficiency ( Fv/ Fm) and photosynthetic O2 evolution maintained higher value in flag leaves of treated plants than that of the control.

叶片光合功能衰老延缓，即叶片PSⅡ光化学效率（Fv/Fm）和光合放氧在衰老后期保持在较高水平，光合色素含量快速降解出现较迟。