T. Sakhno, researcher
V. Petrenkova, professor, chief researcher
Yuriev Plant Production Institute of NAAS of Ukraine
The article describes the studied results of the broomrape influence on growth processes and phenolic compounds content in differentiators during infection. The sunflower differentiators to broomrape races which are used all over the world were used as the model objects in this study. These sunflower samples AD 66 are susceptible to broomrape, Record is resistant to race C, LC 1003 is resistant to race E, LC 1093 is resistant to F race. The susceptible line Cx 908 A was also used. The total phenolic compounds content in sunflower plants was determined by spectrophotometric method. The research results of the samples infestation level showed the presence of high virulent broomrape races 5 (E) and 6 (F). It was established that the parasite significantly inhibits the sunflower growth processes. Most morphometric parameters of sunflower plants are decreased after inoculation. The phenol content in the leaves of the samples was higher than in the roots. The level of phenolic compounds in sunflower plants was significantly increased under broomrape affection. The reduction of phenols was observed in susceptible samples AD 66 and Сх 908 А after the inoculation. The studied results made it possible to assert that the phenolic compounds play an important role in developing the sunflower resistance to broomrape. Line Cx 908 A should be used as a standard of susceptibility to broomrape.
Key words: sunflower, differentiators, broomrape, phenolic compounds, morphometric parameters.
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