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植物生长在低硒土壤时,株高正常而组织含硒量低,而生长在低锌土壤时,则是株体矮小而含锌量正常。类似的实验结果在细菌或动物中也可见到。共同的特点是某些营养素缺乏时,机体生长正常,仅组织含量下降,另一些营养素缺乏时,其组织浓度正常,机体矮小。1.营养素缺乏的分类新的分类方法是基于一种营养素缺乏时机体出现的2种基本不同的反应。这种分类方法反映营养素本身的特征,即机体对营养素的需要和代谢方式。根据缺乏时机体的反应可分为:1.1 Ⅰ型营养素这类营养素缺乏时,“特殊的”或“典型的”反应是组织中该营养素含量下降。此类营
Plant growth in low selenium soil, the plant height is normal and tissue selenium content is low, while growing in low-zinc soil, the plant is short and zinc content is normal. Similar experimental results are also seen in bacteria or animals. Common feature is the lack of certain nutrients, the body grows normally, only the tissue content decreased, while some other nutrients, the normal tissue concentration, body short. 1. Nutrient Deficiency Classification The new classification method is based on two fundamentally different responses to the body in the absence of a nutrient. This classification reflects the characteristics of nutrients themselves, the body’s nutrient needs and metabolic methods. According to the lack of time the body’s response can be divided into: 1.1 Type I nutrients In the absence of such nutrients, the “special” or “canonical” response is a decrease in the nutrient content of the tissue. Such camp