Acta Agriculturae Boreali-Sinica ›› 2022, Vol. 37 ›› Issue (1): 172-180. doi: 10.7668/hbnxb.20192199

Special Issue: Oil crops

• Resources & Environment·Plant Protection • Previous Articles     Next Articles

Identification and Pathogenicity Differentiation of the Pathogens Causing Necrotic Spot on Sunflower Broomrape

ZHANG Jian1, WANG Na1, LIU Zhida1, BAO Tingting1, ZHANG Zhiwei1, YUN Xiaopeng2, SHI Bixian3, ZHANG Heng3, CHEN Guihong4, CHEN Yanfang4, ZHAO Jun1   

  1. 1. College of Horticulture and Plant Protection,Inner Mongolia Agricultural University, Hohhot 010018,China
    2. Plant Protection Institute,Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences,Hohhot 010031,China
    3. Institute of Economic Crops,Xinjiang Academy of Agricultural Sciences,Urumqi 830091,China
    4. Agricultural Research Institute of the 10th Division of Xinjiang Production and Construction Corps,Beitun 836099,China
  • Received:2021-10-20 Published:2022-02-28

Abstract:

In order to obtain the biocontrol strains of sunflower broomrape,this study took the occurrence of necrotic spot as samples of sunflower broomrape,and used the Koch's rule to separate and identify 29 samples of necrotic spot collected from 11 different locations in Inner Mongolia,Hebei and Xinjiang.The results showed that Fusariun oxysporum and F.solani were isolated from the disease samples collected from the 183 Regiment and 188 Regiment of Beitun Agricultural Tenth Division,Xinjiang and Xihaizi Village,Wuchuan County,Hohhot.F.oxysporum and F.equiseti were isolated from disease samples from Xixiaozhao Town,Urad Front Banner,Kuiboyuan,Wuyuan County and Yongli Village,Linhe District in Bayannur City.F.oxysporum,F.solani,F.equiseti and F.proliferatum were identified from the disease samples in the Gonghecheng Village and Xigedan Village,Siziwang Banner and a plot next to Provincial Highway 105 in Huade County.Only F.oxysporum was isolated from the samples collected in Dongsheng District,Ordos.In Kangbao County,Zhangjiakou City,Hebei Province,only F.verticillioides was isolated from samples collected.The above-mentioned isolated strains could cause disease symptoms after being re-inoculated on Helianthus angustifolia.The result indicated that the fungus of the genus Fusarium was the pathogenic fungi that caused blight in sunflower broomrape.However,F. oxysporum was the predominant pathogen of sunflower broomrape necrotic spot.The results of pathogenic differentiation studies showed that all the isolated strains were able to infect sunflower and broomrape,however,there were certain differences in their pathogenicity,which mainly exhibited stronger pathogenicity on isolated hosts than that of other host.Based on the results of pathogenicity differentiation,three strains of F.oxysporum GHC 1-2,XXZ-9 and HD 1-1 with biocontrol potential on broomrape were selected to control the parasitism of broomrape on sunflower.

Key words: Sunflower broomrape, Broomrape necrotic spot, Koch's rule, Isolation and identification of pathogenic fungi, Reciprocal pathogenicity

Cite this article

ZHANG Jian, WANG Na, LIU Zhida, BAO Tingting, ZHANG Zhiwei, YUN Xiaopeng, SHI Bixian, ZHANG Heng, CHEN Guihong, CHEN Yanfang, ZHAO Jun. Identification and Pathogenicity Differentiation of the Pathogens Causing Necrotic Spot on Sunflower Broomrape[J]. Acta Agriculturae Boreali-Sinica, 2022, 37(1): 172-180. doi: 10.7668/hbnxb.20192199.

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