Plant Responses to Inadequate and Toxic Micronutrient Availability: General and Nutrient-Specific Mechanisms

摘要: By definition, mineral nutrients have specific and essential functions in plant metabolism. For each given nutrient, the minimal adequate supply rate varies strongly, both between within species, usually a nutrient-specific way. The maximally tolerable rates are equally variable often positively correlated with minimally required ones. Depending on quantity which it is required, any nutrient can be classified as either macronutrient or micronutrient. To date, iron (Fe), manganese (Mn), copper (Cu), zinc (Zn), nickel (Ni), molybdenum (Mo), boron (B), clorine (Cl) been idendified universal micronutrients (Marschner, 1995). Both sufficiency toxicity thresholds for micronutrient lower than those supply, by several orders of magnitude, except Cl, not very toxic.