Effects of shading on the growth and physiological indexes of Cassia tora seedlings
Effects of shading on the growth and physiological indexes of Cassia tora seedlings were researched,four shading treatments including full sunlight(T0),50％-75％sunlight(T1),20％-25％sunlight(T2)were set.The results showed that:(l)Under shading,Height,base diameter increased significantly,number of branches and pods manifolded,however,there was no significant difference about the pod shape size and the control.Under low-light environment the main root length and root amplitude of seedlings increased,but the difference and control treatments was not significant,and the length,thickness and quantity of lateral roots did not change significantly.(2)The soluble protein content in leaves increased under shading,index value under T,and T2 were 2.39 and 2.47 fold higher than the control treatments,respectively,and were significantly lower than the control(P＜0.05).Soluble sugar content showed similar changes.(3)With weakening of light,the chlorophyll content in leaves increased,so moderate shading could promote the synthesis of chlorophyll in seedlings leaves,which was conducive to better capture the light.MDA in leaves decreased and was significantly lower than the control(P＜0.05).It is concluded that the moderate low light did not adversely affect development of Cassia tora seedlings,and 50％sunlight can provide superior conditions for the growth of C.tora seedlings,so interplanting is feasible in practice.
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