化杀杂种小麦灌浆规律及粒重优势

对化杀杂种小麦灌浆特性及播期、密度、灌水效应的研究表明，其灌浆规律与常规（亲本）品种相同，籽粒增重遵循慢—快—慢的节律变化，同时具有自己的特性。杂种的快速增重期较对照早１～３天，灌浆速度峰值超对照优势达２４．７１％～４６．３４％，且持续时间长，灌浆速度的峰面宽，因而单粒重比对照高６～１１ｍｇ，但不同部位小穗间的粒重差异依然存在，且较对照大。杂种的灌浆特性与亲本有关，但仍表现出明显的超亲优势。播期、密度、灌水等影响灌浆进程，因而可通过亲本选配、强优势组合筛选及农艺措施调节进一步发挥杂种的粒重优势

Grain Filling Characteristics of Hybrid Wheat Emaculated with Chemicals and Its Grain Weight Heterosis

The results of studies on grain filling chracteristics of hybrid wheat emaculated with chemicals and the effects of such agronomical measurements as plant date,planting density and irrigation indicated that hybrid wheat,having the same grain weight increase pattern as common wheat (check),showed its own grain filling characteristics. The date of fast grain weight increase for the hybrid wheat was 1 3 days earlier than common wheat varity Jimai 30,so that its grain filling period was longer. The heterosis of maximum grain filling rate was 24 17-46 34% Final grain weight was 6 11 mg/grain higher than that of common wheat (check),but the grain weight difference between different spikelets was greater.Grain filling characteristics of the hybrid wheat has some relationship with its parents.The process of grain filling was affected by plant date,planting density and irrigation management ect,therefore,grain weight could be further improved through parental selection and cultivation measurements.