冬小麦品种（系）穗层结构的差异及其与产量的关系

调查分析了12个品比试验的小麦品种（系）和3个当前主栽品种的穗层厚、穗层数、曲线宽度、穗层章度比、穗层结构指数等穗层结构指标，结果表明：冬小麦品种（系）穗层结构存在很大差异。高产品种可以有不同的穗层结构，不宜把穗层欠整齐一律当作低产性状而加以淘汰。本文提出的穗层结构指数，可以作为选择品种的参考。不同穗层结构指标要综合分析、互相验证，有助于对品种穗层结构特性作出较科学合理的评价。

The Difference of the Spike-layer Architecture and its Relation to Yield in Winter Wheat Cultivars

The twelve winter wheat cultivars (lines) of performance test and three major cultivars at present were used to investigate and analyze some spike layer indices, such as spike layer thickness, the number of spike layers, the width of the distributional curve of spike layer, spike layer uniformity ratio, and spike layer architecture index(SLAI).The results showed that there was significant difference in cultivars'(lines)spike layer architecture. Since high yielding cultivars didn't belong to one type of spike layer architecture, it was not correct to take the nonuniformity by all means as the low yielding characteristics. SLAI suggested by this paper could be used as the reference for the selection of the cultivar. Taking different indices into comprehensive analysis was conducive to a more scientific evaluation of cultivar's spike layer architecture.