Effect of iron-supply to the half root on chlorophyll fluorescence parameters of Pyrus betulaefolia seedlings

Abstract：【Objective】To explore the changes of chlorophyll content, active iron and chlorophyll fluorescence parameters of Pyrus betulaefolia seedlings under iron-supply to the half root system.【Methods】The chlorophyll content, active iron content and chlorophyll fluorescence parameters were measured on the leaves of 1-year-old Pyrus betulaefolia seedlings treated with iron deficiency, iron supply to the half-root and iron supply to the whole root.【Results】Compared with the iron deficiency condition, the chlorophyll content and active iron content in the leaves of Pyrus betulaefolia increased by55.5% and 98.5%, respectively with the treatment of iron-supply to the half root.Fowas significantly lower and F_v/F_m and ΦPSII were significantly higher with iron-supply to the half root than those with iron deficiency.There were no significant differences in the three parameters between iron-supply to the half root and to the whole root.【Conclusion】Under the condition of iron-supply to the half root, the normal photosynthetic capacity of Pyrus betulaefolia leaves can be maintained, which provides a theoretical basis for reducing the cost of applying chelated iron fertilizer.