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首页> 外文OA文献 >Rhizosphere Soil Aggregation and Plant Growth Promotion of Sunflowers by an Exopolysaccharide-Producing Rhizobium sp. Strain Isolated from Sunflower Roots
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Rhizosphere Soil Aggregation and Plant Growth Promotion of Sunflowers by an Exopolysaccharide-Producing Rhizobium sp. Strain Isolated from Sunflower Roots

机译：产生胞外多糖的根瘤菌对根际土壤聚集和向日葵生长的促进作用与向日葵根分离的菌株

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摘要

Root-adhering soil (RAS) forms the immediate environment where plants take up water and nutrients for their growth. We report the effect of an exopolysaccharide (EPS)-producing rhizobacterium (strain YAS34) on the physical properties of sunflower (Helianthus annuus L.) RAS, associated with plant growth promotion, under both water stress and normal water supply conditions. Strain YAS34 was isolated as a major EPS-producing bacterium from the rhizoplane of sunflowers grown in a French dystric cambisol. Strain YAS34 was assigned to the Rhizobium genus by 16S ribosomal DNA gene sequencing. Inoculation of sunflower seeds and soil with strain YAS34 caused a significant increase in RAS per root dry mass (dm) (up to 100%) and a significant increase in soil macropore volume (12 to 60 μm in diameter). The effect of inoculation on sunflower shoot dm (up to +50%) and root dm (up to +70%) was significant under both normal and water stress conditions. Inoculation with strain YAS34 modified soil structure around the root system, counteracting the negative effect of water deficit on growth. Using [15N]nitrate, we showed that inoculation made the use of fertilizer more effective by increasing nitrogen uptake by sunflower plantlets.
机译：根系附着的土壤（RAS）形成了植物吸收水分和养分的直接环境。我们报告了在水分胁迫和正常供水条件下，一种产生胞外多糖（EPS）的根瘤菌（菌株YAS34）对向日葵（Helianthus annuus L.）RAS物理特性的影响，与植物的生长促进有关。从法国dystric cambisol中生长的向日葵的根际分离菌株YAS34作为主要的EPS产生细菌。通过16S核糖体DNA基因测序将菌株YAS34分配给根瘤菌属。用菌株YAS34接种向日葵种子和土壤会导致单位根干质量（dm）的RAS显着增加（最高100％），土壤大孔体积（直径12至60μm）显着增加。在正常和水分胁迫条件下，接种对向日葵芽dm（最高达+ 50％）和根dm（最高达+ 70％）的影响都是显着的。接种YAS34菌株会改变根系周围的土壤结构，抵消了水分亏缺对生长的负面影响。我们使用[15N]硝酸盐表明，接种可以增加葵花苗对氮的吸收，从而使肥料的使用更加有效。

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