【摘要】 在日光温室内,以普通番茄为试材,进行开花期、坐果期、绿熟期的透光率100%、75%5、0%、25%的不同光照强度处理,研究了NO3-的吸收、运输和还原、无机氮含量变化以及有机氮含量变化和一些相关酶的活性。结果表明:番茄根系活力受光强的影响较小;伤流液量及伤流液、茎、叶中NO3-的吸收和运输随光强的减弱而降低。谷氨酰胺合成酶活性与光强降低呈正相关。随光强减弱番茄叶和茎上部全氮含量先升高后降低,茎下部全氮含量先降低后升高。光照强度影响有机氮化物的含量,适度遮荫时番茄氨基酸和可溶性蛋白质升高,而光强继续降低则含量也降低。短期弱光促进叶部氨基酸和蛋白质合成积累,处理时间延长有机氮化物合成与积累受到抑制.更多还原

【Abstract】 The paper designed different shading treatments, and select one tomato varieties(Lycopersion esculentum cv.Mill) as material.Shading was carried out in flowering,fruit setting and green-matured period separately with light in a solar greenhouse being control,light penetrate ratio were 75%,50% and 25% respectively.Treatment was created by different shading ratio.Those characters include the absorption、 transportation and deoxidization of NO-3,the concentration of the inorganic nitrogen and the organic nitrogen,and some relative enzyme activities.The results were as follows: Low light intensity has little effect on root vigor of tomato.Under low light condition,the volume of xylem exudation and the absorption and transportation of NO-3 in xylem exudation、stem and leaf reduced gradually.GS activity is co-related with light intensity reduce.The total nitrogen content increases at beginning treatment and reduces follow,But it is opposite in down part of stem.The light intensity affects the organic nitrogen content.Shaded to a proper extent,AA in tomato and soluble protein will increase;however they reduced as the light intensity reduced bitter.Short-term low light intensity will accelerate the synthesis and accumulation of AA and protein in the leaf,but the prolong the treating time restrained them synthesis and accumulation.更多还原