نتایج جستجو برای: dapg
تعداد نتایج: 96 فیلتر نتایج به سال:
سودوموناسهای فلورسنت از مهمترین عوامل کنترل بیولوژیک بیماریهای گیاهی هستند که بهصورت مستقیم، با تولید و ترشح متابولیت های بازدارنده و سیدروفورها، سبب محدودکردن یا توقف رشد بیمارگرهای گیاهی بهویژه قارچ ها میشوند و برخی با تولید هورمونهای مختلف سبب افزایش رشد گیاه میشوند. هدف از این پژوهش معرفی و بررسی برخی خصوصیات استرین جدید p. fluorescen utpf68است که از منطقه ریزوسفر گیاه کلزا مزارع ...
It is one of the most nutritious millet and staple food in different states of India and Pseudomonas sp. MSSRFD41 MSSRFD41 was isolated from finger millet rhizosphere soil samples. 16S rRNA gene sequence shows maximum 98.77% similarity and forms monophyletic clade with closely related species. It produces 2,4-DAPG, HCN, AHLs, IAA, solubilises phosphate and tolerates 1 M NaCl. Exhibits p...
The Friedel-Crafts acylation is commonly used for the synthesis of aryl ketones, and a biocatalytic version, which may benefit from the chemo- and regioselectivity of enzymes, has not yet been introduced. Described here is a bacterial acyltransferase which can catalyze Friedel-Crafts C-acylation of phenolic substrates in buffer without the need of CoA-activated reagents. Conversions reach up to...
Tomato (Solanum lycopersicum) is a common vegetable crop with worldwide consumption of its edible fruit. Bacterial wilt in tomato causes substantial yield loss. Biological control using microbial agents such as rhizobacteria has gained considerable attention over the last decade. In this study, we isolated a bacterial strain, RS-9 from the rhizosphere of a healthy tomato plant in a bacterial wi...
ABSTRACT Analyses of multiple field experiments indicated that the incidence and relative abundance of root-colonizing phlD+ Pseudomonas spp. were influenced by crop rotation, tillage, organic amendments, and chemical seed treatments in subtle but reproducible ways. In no-till corn plots, 2-year rotations with soybean resulted in plants with approximately twofold fewer phlD+ pseudomonads per gr...
The antibiotic 2,4-diacetylphloroglucinol (DAPG), produced by some strains of Pseudomonas spp., is involved in suppression of several fungal root pathogens as well as plant-parasitic nematodes. The primary objective of this study was to determine whether Wood1R, a D-genotype strain of DAPG-producing P. fluorescens, suppresses numbers of both sedentary and migratory plant-parasitic nematodes. An...
There is a significant potential to improve the plant-beneficial effects of root-colonizing pseudomonads by breeding wheat genotypes with a greater capacity to sustain interactions with these bacteria. However, the interaction between pseudomonads and crop plants at the cultivar level, as well as the conditions which favor the accumulation of beneficial microorganisms in the wheat rhizosphere, ...
To investigate the impact of genetically modified, antibiotic-producing rhizobacteria on the indigenous microbial community, Pseudomonas putida WCS358r and two transgenic derivatives were introduced as a seed coating into the rhizosphere of wheat in two consecutive years (1999 and 2000) in the same field plots. The two genetically modified microorganisms (GMMs), WCS358r::phz and WCS358r::phl, c...
سودوموناسهای فلورسنت مولد 2و4-دیاستیل فلوروگلوسینول(DAPG) در بیوکنترل بسیاری بیماریهای قارچی گیاهان نقش دارند. پژمردگی فوزاریومی گوجهفرنگی یکی از مهمترین بیماریهای این گیاه است که خسارت زیادی را به محصول وارد میآورد. در این پژوهش 35 سویه Pseudomonas fluorescens از نظر وجود ژنهای phlD و hcnAB بررسی شده و مشخص گردید نه سویه واجد ژنهای بیوکنترل بودند. توانایی آنتاگونیستی سویههای واجد دو ...
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