植物的抗旱性鉴定问题很久以前已经引起了许多研究者的注意。在这个问题上过去大多数的工作者们,特别注意去寻找那些与植物高度抗旱性相关的形态学的、解剖学的或生理学的特征。也就是企图找到抗旱性的间接标志,但是他们并没有得到令人满意的结果,因为对现象的真正认识必须是建立在因果关系上而不是建立在相关的联系上。绝不能根据任何一个特征(何况往往不是用成长植株而是幼苗的特征)来决定像抗旱性这样一个复杂的现象,那怕它是很重要的特征。首先抗旱性不是固定不变的,它在个体发育过程中常常是有变化的,如在临界期抗旱性就会降低,然後又会重新升高。其次,由於植物的生育条件不同抗旱性会有很大的变动。最後,我们说今天对抗旱性的理解不应只是一种特性,而最低 The drought resistance appraisal of plants has long attracted the attention of many researchers. Most of the workers on this issue used to pay special attention to finding the morphological, anatomical or physiological features that are associated with the plant’s high drought resistance. That is, they are trying to find an indirect sign of drought resistance, but they are not getting satisfactory results because the true understanding of the phenomenon must be based on the causal relationship rather than on the related linkages. The complex phenomenon of drought resistance must not be decided on the basis of any one trait (not to mention the fact that it is often not the result of growing plants but seedlings), even if it is a very important trait. First, drought resistance is not static. It often changes during the development of an individual. For example, drought resistance will decrease at a critical stage and then increase again. Second, there will be a great deal of change in drought resistance due to plant growth conditions. Finally, we say that today’s understanding of drought resistance should not be just a feature but the lowest