title: [Identification of disease resistance to Ustilago coicis in southern Coix germplasm].
abstract: OBJECTIVE
  To identified the resistance of Coix to Ustilago coicis and screen the high disease-resistance Coix germplasm.
  
  
  METHODS
  Field and laboratory biochemical methods were used for the resistance identification. Ninteen germplasms collected from 7 provinces in southern of China such as Yunnan, Zhejiang, Fujian etc. were inoculated with chlamydospore of U. coicis, respectively. The incidence of a disease in field was investigated and the level of resistance was evaluated. The PAL activity dynamic changes in different level resistant germplasms were further determined.
  
  
  RESULTS
  The result of field test showed 1 germplasm was immune, 1 germplasm was high resistance which incidence rate was under 20%, 6 germplasms were moderate resistance with the average incidence rates ranged within 20% - 40%, 11 of 19 germplasms that average incidence rates above 40% were identified as sensitive resistance. The value of PLA activity peak of resistant germplasm in seedling was significant higher and appeared earlier than that of the sensitive ones after inoculating.
  
  
  CONCLUSIONS
  Most collected C. lacryma-jobi germplasms are sensitive to smut in our investigation; the PAL activity may play important role in Coix germplasm for resistance to smut and the biochemical method may be as an aiding method to resistance identification of Coix germplasm.
authors.affiliation: Institute of Medicinal Plant Development Yunnan Branch, Chinese Academy of Medical Sciences and Peking Union Medical College, Jinghong 666100, China. lige19800221@163.com
authors.forename: Ge
authors.initials: G
authors.lastname: Li
authors.forename: Janming
authors.initials: J
authors.lastname: Peng
authors.forename: Weiwei
authors.initials: W
authors.lastname: Gao
authors.forename: Rongying
authors.initials: R
authors.lastname: Li
authors.forename: Junling
authors.initials: J
authors.lastname: Zhao
authors.forename: Zhian
authors.initials: Z
authors.lastname: Wang
mesh_terms: D002681:China; D031742:Coix / Q000276:immunology* / Q000382:microbiology*; D007113:Immunity, Innate; D010935:Plant Diseases / Q000276:immunology / Q000382:microbiology*; D014588:Ustilago / Q000502:physiology*