Effect of different soil moisture content on growth and non-structural carbohydrates of Cypomandra betacea seedlings
[Objective]To provide reference for water management of Cypomandra betacea seedlings.[Method]A two-factor randomized block test was used to study 1-year-old C.betacea seedlings,and four moisture treatments were set up,i.e.,suitable moisture content treatment,mild water deficit treatment,moderate water deficit treatment,and severe water deficit treatment,with soil moisture content ranging from 26.83%to 30.41%,21.46%to 25.04%,16.10%to 19.67%,and 10.73%-14.31%,respectively,to compare the changing patterns of growth,biomass of various organs and non-structural carbohydrates(NSC)content and accumulation of C.betacea seedlings after different stress times(15,30,45,and 60 d),and to understand the relationship between soil water content on the growth and NSC of C.betacea seedlings growth and NSC.[Result]C.betacea seedling height and diameter continued to grow under appropriate moisture content and mild water deficit treatment,while moderate and severe water deficit treatments had obvious inhibitory effects on seedling height and diameter growth.With the decrease of soil moisture content and the prolongation of stress time,the stem biomass was the highest,and the biomass of each organ was stem,leaf and root in descending order;leaf soluble sugar and NSC content increased gradually;stem soluble sugar and NSC content increased and then decreased;root soluble sugar and NSC content were higher than that of leaf and stem.The starch content of roots,stems and leaves firstly decreased and then increased under appropriate water content,mild water deficit and moderate water deficit treatments.At 15,30 and 60 d of stress,the ratio of leaf and stem soluble sugar to starch content was higher than that of the suitable water content treatment under each treatment,and at 45 d of stress,the ratio of leaf,stem and root soluble sugar to starch content gradually decreased with the decrease of soil water content.[Conclusion]The growth of C.betacea seedlings and the soluble sugar,starch,and NSC contents of each organ responded differently with the prolongation of the stress time,and with the reduction of soil water content,C.betacea seedlings accumulated NSC under a certain stress time as a way to alleviate the effects of water stress on C.betacea seedlings survival.
Cypomandra betaceagrowthsoil water contentnon-structural carbohydrates
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