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نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی سابق کارشناسی ارشد، پردیس کشاورزی ومنابع طبیعی دانشگاه تهران، کرج
2 دانشیار، پردیس کشاورزی ومنابع طبیعی دانشگاه تهران، کرج
3 دانشجوی دکتری، پردیس کشاورزی ومنابع طبیعی دانشگاه تهران، کرج
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In this study, the effects of Pseudomonas fluorescens UTP100 as an rhizobacteria was investigated, on interaction of three wheat cultivars (Falat, Marvdasht, and Niknejad) whit Fusarium culmorum as an causal of agent wheat foot and root rot. Treatment of seeds by the rhizobacterium caused significant decrease in the infection percentage, and improved germination and growth parameters in all three studied cultivars. The colonization rate of the rhizobacteria was significantly different among wheat cultivars, and the highest and lowest numbers of bacterial cells/ mg root dry weight were estimated in Falat and Niknejad cultivars, respectively. Infection of Falat and Marvdasht cultivars by F. culmorum led to decreased rate of bacterial colonization, while the number of bacterial cells increased in Niknejad cultivar following infection by the pathogen. The activity of phenylalanine ammonia lyase (PAL) enzyme, as an important enzyme involved in plant defense against plant pathogens, increased significantly when wheat cultivars were infected simultaneously by both P. fluorescens and F. culmorum compared to when separately treated by each of these agents. This may imply that the rhizobacterium induce systemic resistance to the invaded plant through activation of PAL enzyme.
کلیدواژهها [English]