Compensative effects of plant chemical regulation Of physiological harm caused by water stress after flowering of winter wheat
开花后水分亏缺对小麦生理影响与化学调控的补偿效应

The experiment was conducted with winter wheat cv. Jin gd ong 6 in PVC pipe and under rain free condition. It is indicated that all the di stribution of 3H 2O in roots and flag leaf, characteristics of vascular b und le in primary roots and internode below ear, roots validity, transpiration rate and stomatal impedance of flag leaf are changed by water stress after flowering. The treatments of seed coating and foliage spraying at early jointing stage usi ng Beinong 6(HK6),a plant growth regulator, are proved to release and compensate the harmful effects of water stress. Both the area of vascular bundle in primar y roots and internode below ear are increased by HK6,while the roots validity an d the ability of water absorption and transportation are promoted. In flag leaf, stomatal impedance is changed to maintain the transpiration rate and the water use efficiency of single wheat plant is higher. The rate and ratio of 14 C-assimilates exported from flag leaf are increased by the chemical regula tion.