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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (12): 2723-2734.doi: 10.16420/j.issn.0513-353x.2022-0999

• Plant Protection • Previous Articles     Next Articles

Identification and Biological Characteristics of the Pathogens Causing Marigold Wilt in Xinjiang

Nursimangul·Aihaiti1, Aigamarie·Abdulzaire1, SUN Yongmin2, HAN Wenjie3, GUO Qingyuan1,*(), WANG Lili1,*()   

  1. 1 Key Laboratory of Prevention and Control of Invasive Alien Species in Agriculture & Forestry of the North-western Desert Oasis(Co-construction by Ministry and Province),Ministry of Agriculture and Rural Affairs,Key Laboratory of the Pest Monitoring and Safety Control of Crops and Forests,Agricultural College,Xinjiang Agricultural University,Urumqi 830052,China
    2 Flower Industry Management Center of Xinjiang Uygur Autonomous Region,Urumqi 830052,China
    3 Chenguang Biotechnology Group Shache Co., Ltd.,Shache,Xinjiang 844700,China
  • Received:2023-04-13 Revised:2023-10-15 Online:2023-12-25 Published:2023-12-29
  • Contact: GUO Qingyuan, WANG Lili

Abstract:

The purpose of the study was to clarify the species and biological characteristics of the pathogens of marigold wilt in Xinjiang Uygur Autonomous Region. A series of experiments were conducted through tissue isolation,single spore purification,pathogenicity determination,morphological Characteristics,phylogenetic analysis of ITS and EF-1α sequences and identification of biological characteristics. The results showed that four pathogens were identified as Fusarium fujikuroiF. solaniF. equiseti and F. culmorum. The optimum temperature for the growth of all Fusarium species was 25 ℃ and the optimum pH range was 6-7. Full-darkness was conducive to the mycelial growth of F. fujikuroi,but full-light was suitable for the rest species. They differed in their optimum growing conditions. The mycelial of F. fujikuroi grew better on media of PDA and PSA,and was in favor of lactose and potassium nitrate as the optimal carbon and nitrogen sources. For F. equiseti,the optimal medium was PDA,and the optimal carbon and niteogen sources were lactose and yeast extract. For F. solani,the best medium was Czapek medium,and the best carbon and nitrogen sources were lactose and peptone. For F. culmorum,the beneficial media were PSA,PDA and CA,and the beneficial carbon and nitrogen sources were soluble starch,yeast extract and ammonium chloride. Their mycelial lethal temperature were at 64 ℃,63 ℃,63 ℃,52 ℃ for 10 min respectively. Among of them,F. solani is the most dominant pathogenic species causing marigold wilt in Xinjiang because of highest separation frequency of 68%.

Key words: Xinjiang, marigold wilt, Fusarium, identification, biological characteristics