Abstract: The anatomic structures of vascular system in upper four leaves and basal stems and peduncles were measured by using different winter wheat genoty pes under dif ferent irrigation cond-itions. The result show ed that the vascular number of leaf decreased progressively with the leaf position lowered. Significant genoty pic differences ex isted in the upper three leaves and the stems. Irrigation before winter increased leaf vascular number more than the irrigation in early spring, while the lat ter enlarge the leaf sizes considerably. The growth of stem vascular system was decreased by water stress. The leaf sizes were more notabl affected by different water regimes than the leaf vascular system. Irrigat ion g iven at joint ing stage markedly influenced the development of stem vascular system.

Key words: Winter wheat, Vascular system, Dissection structure

CLC Number: 

• S512.101