Enhancing the internal plant colonization rate with endophytic nitrogen-fixing bacteria

Several diazotrophic strains of Klebsiella oxytoca and K. terrigena that colonize the plant-host interior were able to produce the plant cell wall depolymerising enzyme pectate lyase (Pel). The activity of the K. oxytoca enzyme was weaker than that of phytopathogenic bacteria, and it was located mai...

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Бібліографічні деталі
Дата:1999
Автори: Kovtunovych, G., Lar, O., Kordyum, V., Kleiner, D., Kozyrovska, N.
Формат: Стаття
Мова:English
Опубліковано: Інститут молекулярної біології і генетики НАН України 1999
Назва видання:Биополимеры и клетка
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Онлайн доступ:http://dspace.nbuv.gov.ua/handle/123456789/156569
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Назва журналу:Digital Library of Periodicals of National Academy of Sciences of Ukraine
Цитувати:Enhancing the internal plant colonization rate with endophytic nitrogen-fixing bacteria / G. Kovtunovych, O. Lar, V. Kordyum, D. Kleiner, N. Kozyrovska // Биополимеры и клетка. — 1999. — Т. 15, № 4. — С. 300-305. — Бібліогр.: 22 назв. — англ.

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Digital Library of Periodicals of National Academy of Sciences of Ukraine
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Резюме:Several diazotrophic strains of Klebsiella oxytoca and K. terrigena that colonize the plant-host interior were able to produce the plant cell wall depolymerising enzyme pectate lyase (Pel). The activity of the K. oxytoca enzyme was weaker than that of phytopathogenic bacteria, and it was located mainly inside the cells. A small fraction of the cells (10⁻⁶ to 10⁻⁵) in populations grown in nonselective media was able to grow in a selective medium with polygalactorunate (PC) as sole carbon source. After passage through selective medium cells were converted to the Pet+ -phenotype, and total Pet-activity in population of K. oxytoca increased. The increased level of Pelactivity of K. oxytoca and K. terrigena correlated with a 10-fold higher rate of internal colonization of wheat roots. Cultures of K. oxytoca VN13 grown in selective medium with PG also showed increased stimulation of wheat growth. Seedlings inoculated with such cultures exhibited better development resulting in higher biomass.