关键词: 草莓, 休眠, 光合特性, ¹⁵N, 吸收, 分配

Abstract: 【Objective】Understand to effect of the photosynthetic characteristics,¹⁵N absorption and distribution of strawberry under different dormancy states.【Methods】The differences of strawberry leaf morphological indexes and photosynthetic characteristics were compared between deep dormancy（dwarfed plant）strawberry with non-deep dormancy（not dwarfed plant）during the dormancy period of strawberry in winter. The isotopic tracer method was used to study the difference of ¹⁵N absorption and distribution of strawberry under different dormancy degrees.【Results】The petiole became shorter and the area of single leaf became smaller as the dormancy strengthened.The net photosynthetic rate of strawberry with deep dormancy was lower than that of strawberry with shallow dormancy,but the intercellular CO₂ concentration of the deep domant strawberry was higher.The stomatal conductance of the deep dormant strawberry was higher than that of the shallow dormant strawberry from 8：30 am to 10：30 am.In the dormant state,the root system was the organ with the largest dry matter accumulation and the organ with the highest nitrogen distribution and utilization rate in strawberry. The root system had the strongest ability to absorb and regulate ¹⁵N in the strawberry as the dormant strengthened,while the leaves had the strongest ability to absorb and regulate ¹⁵N for the strawberry as the dormancy shallow.The ¹⁵N distribution rate of strawberry leaves decreased significantly with the deepening of dormancy.The ¹⁵N distribution rate was 18.84% in the deep domant strawberry leaves,and it was 36.74% in the shallow dormancy leaves.【Conclusion】In winter,the dormancy depth of strawberry affected the photosynthesis,nitrogen uptake and distribution of strawberry in solar greenhouse.

Key words: Strawberry, Dormancy, Photosynthetic characteristics, ¹⁵N, Absorption, Distribution