缺绿病，也称为萎黄病，是植物体叶绿素含量不足的情况。 由于植物的绿色是叶绿素造成的，缺乏叶绿素的植株会呈现白色或黄色。这样的植物几乎无法有效地进行光合作用来合成糖类，所以很难在得到营养供应或者治疗之外的情况下存活。 有些人工造成的缺绿植物，如'突变'ppi2基因'产生的白化'拟南芥'，如果用外生蔗糖供应，是可以生长存活的

In botany, chlorosis is a condition in which leaves produce insufficient chlorophyll. As chlorophyll is responsible for the green color of leaves, chlorotic leaves are pale, yellow, or yellow-white. The affected plant has little or no ability to manufacture carbohydrates through photosynthesis and may die unless the cause of its chlorophyll insufficiency is treated, although some chlorotic plants, such as the albino Arabidopsis thaliana mutant ppi2, are viable if supplied with exogenous sucrose.