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《Journal of Northwest Sci-Tech University of Agriculture and Forestry》 1989-04
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Zhang Xian Wang Ming (Northwestern Agricultural University")  
The results showed that the distribution of vessels and number of central vessels of root system and the thickness of their cell wall xylem are related to the ability of resistance to Fusarium wilt of watermelon varieties. There was no significant correlation between the activity of poly phenol oxidase and pero-xidase and the resistance, but there was a remarkable correlation between activity of vitamin C oxidase and the resistance. Thus for the activity of vitamin C oxidase can be used as a biochemical parameter for screening watermelon varieties with resistance to Fusarium wilt. The Fusarium wilt disease resistant watermelon varieties have the higher contents of glycine, serine, alanine, threonine, proline and arginie and the Fusarium wilt disease susceptible watr-melon varieties have the higher contents of leucine, methionine and tyrosine.
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