高产小麦穗粒重补偿性增长效应研究

Study on Compensatoty Changes in Spike Kernel Weight of Wheat under High Yielding Condition

研究了高产条件下去除小穗对小麦穗粒数、千粒重和穗粒重的影响。结果表明，去除１～３个小穗，小麦的千粒重和结实率同步提高，穗粒重补偿性增长，平均增加７％～１０％；８个供试品种的千粒重皆因去小穗而增加，且存在增长极限。各品种的千粒重和穗粒重最大增长幅度均与粒重成负相关，说明８个小麦品种（系）皆为“源”限制性品种（系）。

The experiment was carried out from 1992 to 1994 on the experimental farmof Shandong Agricultural University in Taian.Effects of partial degraining on spike kernelweigth of wheat were studied.The experimental results indicated that kernel weight and ker-nel setting increased simatanously when 1～3 spikelets were removed,which resulted in com-pensatory increase in spike kernel weigth,the average spike weight increased by 10%～7%,Across all cultivars,kernel weight increased with partiial degraining before reaching their lim-it,suggesting the kernel growth of all cultivars was limited by source.The experimentshowed that kernel growth tended to increase with decreasing kernel weight.