It is well known that high light often causes decreased chlorophyll in plants,but the photosynthetic and physiological characteristics of reduced chlorophyll variants under high light is not well understood.Physi-ological responses to high light intensity in the green stripe and yellow stripe leaf variants of Chlorophytum capense var.medio-pictum were investigated in this study.The results showed that under normal light levels, PSⅡ activity of yellow stripe plants was lower than those of green stripe.However,the level of reactive oxy-gen species remained elevated.After 6 hours of high light stress,the level of reactive oxygen species and activi-ty of antioxidant enzymes varied less in yellow stripe plants.Under a few minutes of high light stress,non-photochemical quenching increased in all tissues,but the non-photochemical quenching of the yellow stripe plants increased less than the others.These results demonstrated that excess light energy in yellow-stripe leaf tissue was not dissipated in the form of heat;furthermore,the level of non-photochemical quenching in yellow stripe plants was restored in a few minutes.%强光胁迫常常导致植物的叶绿素含量下降，但是叶绿素合成受阻的突变体在光胁迫下会发生怎样的生理生化变化目前未见报道。本研究以金心吊兰为材料，研究了同一叶片的不同区带对短时强光胁迫的生理响应。结果表明，1）在正常的光照下，金心部分 PSⅡ的活性显著低于其他部分，但活性氧含量却维持在较高的水平；2）在强光胁迫的6 h 内，金心部分的活性氧波动不大，抗氧化酶活性变化也较小，均低于其他部分；3）短时强光胁迫导致吊兰叶片的非光化学淬灭上升，而金心部分上升幅度较少，说明吸收的过多光能在金心部分不是以热耗散的形式消耗，并且金心部分能在较短的时间内恢复到胁迫前的非光化学淬灭水平。
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