Abstract: Na₂SeO₃ was sprayed on the leaves of different genotypes of foxtail millet materials to explore the difference of selenium sensitivity of foxtail millet germplasm resources. Taking 31 cultivars and landraces as materials, by spraying 110 g·hm^-2 Na2SeO3 at heading stage with water  as control, this paper compared agrological properties and selenium content changes of different varieties after selenium treatment. The results showed that selenium application could significantly (P<0.05) increase the panicle diameter, spike weight and spike grain weight of foxtail millet, and extremely significantly (P<0.01) decrease the plant height and stem diameter. The results of cluster analysis showed that the 31 germplasm resources of millet could be divided into 4 groups, among which the first group was selenium-sensitive material with Sanbianlian, the second group was selenium-resistant material with Changsui 7, the third group included Wawuli, 95 jian 5, Xia 2, and others were the fouth group. The results of principal component analysis showed that the cumulative contribution rate of the first four principal components was 76.11%, and the main load factors were spike weight, spike grain weight, panicle length, selenium content, spike number and thousand grain weight. Those results provided a theoretical basis for the screening of selenium-rich foxtail millet materials and a reference for the breeding of selenium-rich foxtail millet.

Key words: foxtail millet, Na2SeO3, selenium sensitivity, agronomic characters, genotypes

摘要： 通过对不同基因型谷子材料叶面喷施亚硒酸钠，探究谷子种质资源的硒敏感性差异。以31份谷子育成品种及地方品种为试验材料，抽穗期喷施110 g·hm^-2的亚硒酸钠，设置清水对照，比较不同谷子品种在硒处理后农艺性状及硒含量的变化。结果显示，施硒可以显著（P<0.05）增加谷子穗粗、穗重和穗粒重；极显著（P<0.01）降低株高和茎粗。经聚类分析，31份谷子种质资源可分为4个类群，其中第一类群为硒敏感型材料三变脸，第二类群为耐硒性材料长穗7，第三类群为瓦屋里、97鉴5、夏2，其余品种为第四类。主成分分析结果表明：前四个主成分累计贡献率为76.11%，主要载荷因子分别为穗重、穗粒重，穗长、硒含量，穗码数和千粒重。上述结果为富硒谷子材料的筛选提供理论依据，并为富硒谷子选育提供参考。

关键词: 谷子, 亚硒酸钠, 硒敏感性, 农艺性状, 基因型