植物周围环境的变化对根、茎和叶部的生长发生影响.作为对干燥的适应现象,根比茎、叶相对的发达.有报道说,用大田条件下的大麦作实验材料,土壤表层的干燥能抑制侧根的生长,但在土壤深层生长的种子根能得到补偿性的生长.与此相反,在砂壤土中进行干燥处理以及通过PEG施加水分膨压的一系列实验中,就未必能看到补偿性的根的生长.但是利用了PEG,侧根尖端积蓄了糖分,根系的其他部分鲜重肯定是会减少的.可见,根尖 The change of environment around the plant has an effect on the growth of roots, stems and leaves.As the adaptation to the dryness, the root is more developed than the stems and leaves.It has been reported that with barley under field conditions as experimental material, Drying can inhibit the growth of lateral roots but compensates for the growth of seed roots in the deeper layers of the soil. In contrast, in a series of experiments where sandy soil is dried and moisture turbulence is applied by PEG, To the compensatory growth of the root.But the use of PEG, the tip of the tip of the root of the accumulation of sugar, the rest of the root fresh weight will certainly be reduced.We can see that the root tip