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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (9): 130-142.DOI: 10.11686/cyxb2022424

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Evaluation of resistance to Colletotrichum cereale and analysis of loss in a field of fifteen imported oat cultivars

Yong-hong SHI1(), Peng GAO1,2(), Zhi-hong FANG1, Xiang ZHAO1, Wei HAN3, Jiang-ming WEI1, Lin LIU1, Jin-zhen LI1   

  1. 1.College of Grassland Science,Shanxi Agricultural University,Jinzhong 030801,China
    2.Key Laboratory for Model Innovation in Forage Production Efficiency,Ministry of Agriculture and Rural Affairs,Jinzhong 030801,China
    3.Datong Qianye Pasture Science and Technology Limited Company,Datong 038200,China
  • Received:2022-10-27 Revised:2023-02-02 Online:2023-09-20 Published:2023-07-12
  • Contact: Peng GAO

Abstract:

Oat (Avena sativa) varieties of high quality and high yield are introduced from other countries and such imports are important to the development of forage-based livestock husbandry in China. However, anthracnose diseased caused by Collectotrichum cereale outbreaks in commercial oat crops is a significant problem with imported varieties. In this study, a total of 15 imported oat varieties were screened for high resistance to anthracnose disease. Simultaneously, we examined the oat yield reduction and quality loss caused by anthracnose. Four resistant varieties were identified: Titan, Everleaf, Souris and Monte. All other varieties were found to be susceptible to anthracnose. The leaf dry weight, stem dry weight, ear dry weight and plant height of the diseased plant of the highly susceptible “Kona” feed oat showed a linear downward trend in proportion to the degree of disease incidence. The forage yield reduction was 7.5%-28.1%, and the regression equation between the yield reduction and mean disease index score was y=0.3023x+1.6822 (R2=0.9837, P<0.05). In this equation, y represents the forage yield reduction of mean disease index score (x) of units. The contents of crude protein, total amino acid, crude ash and phosphorus of moderately and severely diseased plants were significantly (P<0.05) lower than those of healthy plants by 7.2%, 26.5%, 9.0% and 12.8% and by 11.1%, 44.5%, 16.0% and 20.8% respectively. The content of acid detergent fiber in moderately diseased plants increased significantly (P<0.05) by 6.4% compared with healthy plants. The content of neutral and acid detergent fiber in severely diseased plants increased significantly (P<0.05) 11.9% and 10.0% compared with healthy plants, respectively. The reduction in feeding value was 3.2%-15.9%, and the regression equation between the reduction in feeding value and the mean disease index was y=0.1812x+0.5032 (R2=0.9963, P<0.05). In this equation, y represents the forage yield reduction of mean disease index score (x) of units. Hence, the resistant varieties Titan, Everleaf, Souris and Monte are recommended for planting in areas with serious anthracnose. In addition timely and scientifically effective control measures should be implemented. The next step is to screen for superior germplasm with strong disease resistance among local varieties used in China.

Key words: oat (Avena sativa), Collectotrichum cereale, resistance evaluation, yield loss, nutritional quality