谷子干草饲用品质性状变异及相关性分析

谷子是重要的饲草作物, 但其饲草品质性状研究滞后制约了谷子饲草品种培育和栽培。本研究对47个谷子品种在我国高寒农牧地区栽培的饲用干草品质性状进行了系统测定。结果表明, 供试材料粗蛋白含量的变异范围为5.42%~12.45%, 变异系数为14.25；粗脂肪含量的变异范围为0.64%~1.43%, 变异系数为15.84；粗灰分含量的变异范围为8.50%~15.60%, 变异系数为13.71；总磷含量的变异范围为0.10%~0.32%, 变异系数为20.00；总钙含量的变异范围为0.27%~0.67%, 变异系数为20.00。粗纤维、无氮浸出物和水分含量表现出较小的变异。主成分分析表明, 影响谷子饲草品质的主要性状是粗纤维、粗灰分、粗蛋白和无氮浸出物, 粗蛋白与粗纤维和无氮浸出物均为负相关。综合表明, Li05-569、饿死驴、系295和红根谷是品质性状综合表现优良的品种。

Variation and Correlation Analysis of Hay Forage Quality Traits of Foxtail Millet [Setaria italica(L.)Beauv.]

Lack of information about hay forage quality of foxtail millet inbred lines has limited the development of foxtail millet as a forage crop.In this study,forty-seven foxtail millet landraces and improved cultivars were planted in north featured area of China for forage quality identification,frequency distributions of eight quality-related traits were characterized and outstanding lines were screened based on these results.For all the forty-seven accessions,rang of crude protein(CP)content was 5.42-12.45%,with a CV of 14.25;rang of crude fat(CFa)content was 0.64-1.43%,with a CV of 15.84;rang of crude ash(CA)content was 8.5-15.6%,with a CV of 13.71;rang of total phosphorus(TP)content was 0.10-0.32%,with a CV of 20;range of calcium(Ca)content was 0.27-0.67%,with a CV of 20.Crude fiber(CF)content,nitrogen free extract(NFE)content and moisture(MC)content had a lower CV.According to our comprehensive analysis on these data,four lines Li05-569,Esilv,Xi295 and Honggengu were selected as the candidates for forage variety breeding of foxtail millet in the future.