Study on the Pathogenetic Fungi of the Black Point Disease of Wheat and Their Characteristics of Infestation in Xinjiang
[Objective] The fungal identification was determined from the 119 samples of 31 counties during 2003 -2005 in Xinjiang. [Method] Pathogen was isolated and confirmed by back inoculation as well as the Koch's postulates [Result]Alternaria tenuis C. G. Nees. was the main pathogen in all grain -growing areas of Xinjiang; Biplaris sorokiniana ( Sacc. ) Shoem. was the second important pathogen that mainly occurred in some cetain areas. The pathogenicity of Biplaris sorokiniana (Sacc. ) Shoem. was stronger than that of Alternaria tenuis C. G. Nees at inoculation condition in the field. The period of infection was from the heading date to middle filling of wheat, and the last phase of flowering and early filling of wheat was the fittest period of infection for A. tenuis C. G. Nees and B. sorokiniana (Sacc. ) Shoem. The rachilla and glumes were suitable invasion part. There are different in spore geminating and infesting between the two pathogens. A. tenuis C. G. Nees. produced appressoria firstly, then invaded plant organism by penetration peg. B. sorokiniana (Sacc. ) Shoem could geminate from one end or both ends to produce mycelium invading plant organism directly. [Conclusion] Both Alternaria tenuis C. G. Nees. and Biplaris sorokiniana (Sacc.) Shoem. were the main pathogens. Alternaria tenuis C. G. Nees. was widespreaded and with high rate of isolation, whereas Biplaris sorokiniana (Sacc. ) Shoem. with strong pathogenicity. Method of infestation and suitable invaded period are quite different between these two pathogens.
the black point disease of wheatpathogenetic fungicharacteristics of infestation
国家科技期刊平台
NSTL
万方数据
维普
