Abstract:

【Objective】To select oat varieties with high aphid resistance，strong production performance and excellent comprehensive performance，to provide theoretical references for the healthy development of the oat industry in Inner Mongolia.【Methods】In Shaerqin farming-pastoral test site of Institute of Grassland Research of Chinese Academy of Agricultural Sciences in Tumed Left Banner，Hohhot，taking 17 oat varieties as test materials，the aphid resistance was identified by aphid ratio method. The aphid resistance grade of each variety was determined. And the agronomic traits and yield were used as indicators to compare the differences in production performance of the varieties. Bivariate correlation analysis and systematic cluster analysis were performed using agronomic parameters, yield, and aphid ratio as indicators.【Results】The aphid resistance of the test oat varieties was categorized into 6 grades. Baiyan No.7，Mengyan No.3，Qinghai 444，and Qingyin No.2 had high resistance. Qinghaitian oats and Qingyan No.1 showed medium resistance. Mengsiyan No.2，Lingxiu，Beile，Taiyangshen，and Yellow Oats had low resistance. Bayan No.1 and Bayan No.7 were low susceptible. Bayan No.5 was medium susceptible. Aiwo126，Yanwang and Furuizhi were highly susceptible. The plant height of Baiyan No.7 and Taiyangshen reached over 1.18 m，which was significantly higher than that of Bayan No.7，Lingxiu，Yanwang，Qingyin No.2，Aiwo 126，Furuizhi（P<0.05）. Beile had the highest fresh grass yield （4.34 kg/m²），which was significantly higher（P<0.05） than other varieties except Bayan No.5 and Aiwo 126. Taiyangshen had the highest hay yield（1.69 kg/m²），which was significantly higher（P<0.05）than that of Bayan No.7 and Qingyin No.2. There was no significant difference（P>0.05）in the fresh-to-dry ratio of the 17 oat varieties. Aiwo 126 had the highest（2.98） fresh-to-dry ratio，while Qinghai 444 had the lowest（1.86）. The results of cluster analysis showed that the aphid ratio，plant height and yield performance of different oat varieties varied. The comprehensive performance of class I oat varieties（Qinghaitian oats，Mengyan No.3，Qinghai 444，Baiyan No.7，Lingxiu，Qingyan No.1，Yellow Oats，Taiyangshen，Bayan No.1，Bayan No.5，Bayan No.7，and Mengsiyan No.2） was stronger.【Conclusion】Qinghaitian oats，Mengyan No.3，Qinghai 444，Baiyan No.7，Lingxiu，Qingyan No.1，Yellow Oats，Taiyangshen，Bayan No.1，Bayan No.5，Bayan No.7 and Mengsiyan No.2 had strong aphid resistance，good production performance，and excellent comprehensive performance.They were suitable for planting in Tumed Left Banner in Inner Mongolia.

Key words: Oats, Variety, Aphid resistant, Production performance