College of Agronomy, Shenyang Agricultural University, Shenyang, Liaoning 110866, China.
College of Plant Protection, Shenyang Agricultural University, Shenyang, Liaoning 110866, China.
Plant Dis. 2022 Mar;106(3):901-905. doi: 10.1094/PDIS-06-21-1239-RE. Epub 2022 Mar 6.
Oat stem rust, caused by f. sp. , is one of the most devastating diseases of oat. The most cost-effective and environmentally friendly strategy to control this disease is the use of resistant cultivars. However, f. sp. can overcome the resistance of cultivars by rapidly changing its virulence. Thus, information on the virulence of f. sp. populations and resistance of cultivars is critical to control the disease. The current study was conducted to monitor the virulence composition and dynamics of the f. sp. population in China and to evaluate resistance of oat cultivars. Oat leaves naturally infected by f. sp. were collected in 2018 and 2019, and 159 isolates were derived from single uredinia. The isolates were tested on 12 international differential lines, and eight races, TJJ, TBD, TJB, TJD, TJL, TJN, TGD, and TKN, were identified for the first time in China. The predominant race was TJD, virulent against , , , , , , and , accounting for 35.8 and 37.8% in 2018 and 2019, respectively. The sub-predominant races were TJN (30.2% in 2018, 28.3% in 2019) and TKN (20.8% in 2018, 12.3% in 2019). All isolates were virulent to , , , and , and avirulent to and The three predominant races (TJD, TJN, and TKN) were used to evaluate resistance in 30 Chinese oat cultivars at the seedling and adult plant stages. Five cultivars, Bayan 1, Baiyan 2, Baiyan 3, Baiyan 5, and Baiyan 9, were highly resistant to the three races at both seedling and adult plant stages. The results of the virulences and frequencies of f. sp. races and the resistant cultivars will be useful in elucidating the pathogen migration and evolution and for breeding oat cultivars with stem rust resistance.
燕麦秆锈病由 f. sp. 引起，是燕麦最具破坏性的疾病之一。控制这种疾病最具成本效益和环保的策略是使用抗性品种。然而，f. sp. 可以通过快速改变其毒性来克服品种的抗性。因此，了解 f. sp. 种群的毒性和品种的抗性信息对于控制疾病至关重要。本研究旨在监测中国 f. sp. 种群的毒性组成和动态，并评估燕麦品种的抗性。2018 年和 2019 年，从自然感染 f. sp. 的燕麦叶片中采集了 159 个分离物。这些分离物在 12 个国际鉴别系上进行了测试，首次在中国鉴定出 8 个小种，即 TJJ、TBD、TJB、TJD、TJL、TJN、TGD 和 TKN。优势小种是 TJD，对 、 、 、 、 、 和 有毒，分别占 2018 年和 2019 年的 35.8%和 37.8%。次优势小种是 TJN（2018 年 30.2%，2019 年 28.3%）和 TKN（2018 年 20.8%，2019 年 12.3%）。所有分离物对 、 、 、 和 均有毒，对 和 无毒。用三个主要小种（TJD、TJN 和 TKN）在幼苗和成株期评估了 30 个中国燕麦品种的抗性。在幼苗和成株期，五个品种，即 Bayan 1、Baiyan 2、Baiyan 3、Baiyan 5 和 Baiyan 9，对三个小种均表现出高度抗性。f. sp. 小种的毒性和频率以及抗性品种的结果将有助于阐明病原体的迁移和进化，并培育具有秆锈病抗性的燕麦品种。
