不同休眠深度对草莓光合特性和15N吸收分配规律的影响  

Effect of photosynthetic characteristics and the rules of 15N absorption and distribution in strawberry under different dormancy states

作　　者：付崇毅 王永 杨叔青 刘湘萍 FU Chongyi;WANG Yong;YANG Shuqing;LIU Xiangping(Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences,Hohhot 010031,China)

机构地区：[1]内蒙古自治区农牧业科学院,内蒙古呼和浩特010031

出　　处：《北方农业学报》2020年第5期90-94,共5页Journal of Northern Agriculture

基　　金：国家大宗蔬菜产业技术体系项目(CARS-23-G20);内蒙古自治区农牧业科学院青年创新基金项目(2015QNJJN01)。

摘　　要：【目的】明确不同休眠深度对草莓光合特性和15N吸收分配规律的影响。【方法】在冬季草莓休眠期间,比较休眠深(植株矮化)的草莓和休眠浅(植株未矮化)的草莓叶形态指标、光合特性差异;利用同位素示踪方法,研究不同休眠深度草莓15N吸收分配差异。【结果】休眠越深,草莓的叶柄越短,单叶面积越小。休眠深的草莓净光合速率低于休眠浅的草莓,胞间CO2浓度和8:30—10:30气孔导度高于休眠浅的草莓。在草莓休眠状态下,根系是干物质积累量最大的器官,同时也是氮素分配利用率最高的器官;休眠深的草莓根系对15N的吸收征调能力最强,而休眠浅的草莓叶片对15N的吸收征调能力最强;叶片的15N分配率会随着休眠的加深显著降低,休眠深的草莓叶片15N分配率为18.84%,休眠浅的草莓叶片15N分配率为36.74%。【结论】冬季日光温室草莓的休眠深度会影响草莓的光合作用和氮素吸收分配。【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.

关 键 词：草莓 休眠 光合特性 15N 吸收 分配 

分 类 号：S668.4[农业科学—果树学]