过去,育种家们多用叶片凋菱和黄化程度作为作物遭受寒害指标,此法极为费时。应用叶绿素荧光分析,证明能迅速、精确又经济的测定作物寒害程度。在正常情况下,阳光照射植物叶片时约有85％被叶片中色素吸收而行光合作用,剩下的光则转变成热或荧光逸散到大气。这种荧光多从光合系统Ⅱ的叶绿素中散出。外 In the past, breeders often used withered leaf and yellowing degree as a crop chilling injury indicators, this method is extremely time-consuming. Application of chlorophyll fluorescence analysis, proved to be able to quickly, accurately and economically determine the degree of crop damage. Under normal conditions, about 85% of the plant’s sunlight is absorbed by the pigments in the leaves and photosynthesis while the remaining light is converted to heat or fluorescence to the atmosphere. This fluorescence mostly from the photosystem II chlorophyll emission. outer