水分亏缺对小麦抽穗期穗轴维管束系统的影响

利用盆栽试验研究了水分亏缺对抽穗期小麦穗轴维管束系统的影响。结果表明:穗轴大、小维管束数目、横截面积、导管直径和韧皮部面积沿穗轴由下到上依次减小。但下降幅度因维管束种类、穗轴部位而异。同正常供水处理相比，中度水分亏缺下穗轴大、小维管束数目、面积、导管直径和韧皮部面积有所减小。重度水分亏缺则使穗轴大、小维管束数目、面积、导管直径和韧皮部面积明显减小。表明水分亏缺显著改变了小麦穗轴维管束系统的显微解剖结构。

Effect of Water Deficit on Vascular Bundle System of Rachis in Wheat

Pot experiments were carried out to study the effect of water deficit on vascular bundle system of rachis in wheat during heading stage.The results showed that the number and the area of macro-vascular bundle and small-vascular bundle of rachis and the diameter of vessel and the area of phloem decreased from base to top,but the decreased rate differed with the change of the kind of vascular bundle and position of rachis.Compared with normal water treatment,the number and the area of macro-vascular bundle and small-vascular bundle of rachis and the diameter of vessel and the area of phloem decreased under moderate water deficit,while it decreased obviously under the severe water deficit.It showed that the vascular bundle system of rachis in wheat changed apparently under water deficit.