Effect of different exogenous sugars on the growth and nutrient uptake of Malus baccata Borkh.under sub-low root zone temperature
In northern China,soil temperature slowly rises in spring,often subjecting apple roots to sub-low-tem-perature stress.Sugar acts as both a nutrient and signaling molecule in roots in response to low-temperature stress.To explore the effects of exogenous sugars on the growth and nutrient absorption of Malus baccata Borkh.,we ana-lyzed growth parameters,photosynthetic characteristics of leaves,and mineral element content in different tissues of M.baccata seedlings under five treatments,including control(CK),sub-low root zone temperature(L),sub-low root zone temperature+sucrose(LS),sub-low root zone temperature+fructose(LF),and sub-low root zone tem-perature+glucose(LG).The results showed that compared to CK,plant height,root growth parameters,aboveground biomass,leaf photosynthesis,fluorescence parameters,chlorophyll content,and the contents of nitro-gen(N),phosphorus(P),potassium(K),calcium(Ca)and magnesium(Mg)in M.baccata seedlings were significantly decreased under the L treatment,and the content of Ca in roots was significantly increased.Compared to the L treatment without exogenous sugar,photosynthesis,functional parameters,chlorophyll content,and growth parameters increased to different degrees after exogenous sucrose,fructose,and glucose application.The N and P contents in roots were significantly increased.The N,P,and K contents significantly increased in stems while only the Ca content significantly increased in stems treated with sucrose.Leaf N,P,K,Ca,and Mg contents signifi-cantly increased after being treated with the three exogenous sugars.In conclusion,exogenous sugars can improve photosynthetic efficiency,promote mineral element absorption,and alleviate the inhibition of growth and develop-ment of M.baccata at sub-low root zone temperatures,and the effect of sucrose treatment was better than that of fructose and glucose treatments.
sub-low temperatureexogenous sugarMalus baccatamineral element
万方数据
维普
