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首页> 外文OA文献 >Plant growth stage, fertiliser management and bio-inoculation of arbuscular mycorrhizal fungi and plant growth promoting rhizobacteria affect the rhizobacterial community structure in rain-fed wheat fields
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Plant growth stage, fertiliser management and bio-inoculation of arbuscular mycorrhizal fungi and plant growth promoting rhizobacteria affect the rhizobacterial community structure in rain-fed wheat fields

机译：植物生长阶段，肥料管理和丛枝菌根真菌的生物接种以及促进根瘤菌生长的植物影响雨养麦田的根瘤​​菌群落结构

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The goal of this study was first to assess the dynamics of the bacterial community during a growing season in three Indian rain-fed wheat fields which differ mainly through their fertilizer management and yield and then to study the effects of PGPR/AMF bio-inoculations on the bacterial community structure and wheat growth. The bacterial community structure of the rhizosphere soil (RS) and the rhizoplane/endorhizosphere (RE) was determined by PCR-denaturing gradient gel electrophoresis. Seed treatments consisted of consortia of two PGPR strains alone or combined with AMF or AMF alone. The PGPR strains were spp. which included some or all of the following plant growth promoting properties: phosphate solubilisation and production of indole-3-acetic acid, siderophores, 1-aminocyclopropane-1-carboxylate deaminase and diacetyl-phloroglucinol. The mycorrhizal inoculum was an indigenous AMF consortium isolated from the field with the lowest level of fertilization and yield. Variation partitioning analysis of the DGGE data indicated a predominant effect of the wheat growth stage (30.4% of the variance, =0.001) over the type of field (9.0%, =0.027) on the bacterial community structure in the RE. The impact of plant age in the RS was less than in the RE and the bacterial community structure of the field with the highest input of fertilization was very different from the low input fields. The bio-inoculants induced a significant modification in the bacterial community structure. In the RS, the bacterial consortia explained 28.3% (=0.001) and the presence of AMF 10.6% (=0.02) of the variance and the same trend was observed in the RE. Plant yield or grain quality was either increased or remained unaffected. For example, protein content was significantly higher in the treated plants' grain compared to the control plants; maximum values were obtained when the PGPR were co-inoculated with the AMF. The percentage of root colonization by AMF was significantly higher in the treatments containing a mycorrhizal inoculum than in the untreated control and remained unaffected by the PGPR treatments. In conclusion, the wheat rhizobacterial community structure is highly dynamic and influenced by different factors such as the plant's age, the fertilizer input and the type of bio-inoculant. In addition, there is a distance-related effect of the root on the bacterial community. Finally, a combined bio-inoculation of diacetyl-phloroglucinol producing PGPR strains and AMF can synergistically improve the nutritional quality of the grain without negatively affecting mycorrhizal growth.
机译：这项研究的目的是首先评估三个印度雨养麦田在生长季节细菌群落的动态，这主要通过肥料管理和产量而有所不同，然后研究PGPR / AMF生物接种对小麦的影响。细菌群落结构和小麦生长。通过PCR-变性梯度凝胶电泳确定根际土壤（RS）和根际/内生根际（RE）的细菌群落结构。种子处理由两个单独的PGPR菌株或单独与AMF或AMF联合的财团组成。 PGPR菌株为spp。其中包括以下一些或全部促进植物生长的特性：磷酸盐增溶和吲哚-3-乙酸的生产，铁载体，1-氨基环丙烷-1-羧酸脱氨酶和二乙酰基间苯三酚。菌根接种物是从田间分离的具有最低施肥水平和产量的本地AMF财团。 DGGE数据的变异分区分析表明，小麦生长期（变异的30.4％，= 0.001）超过田地类型（9.0％，= 0.027）对RE中细菌群落结构的主要影响。在RS中，植物年龄的影响小于在RE中的影响，施肥量最高的田地的细菌群落结构与低输入量的田地有很大不同。生物孕育剂引起细菌群落结构的显着修饰。在RS中，细菌群落解释了28.3％（= 0.001），并且存在10.6％（= 0.02）的AMF变异，在RE中观察到了相同的趋势。植物产量或谷物品质提高或保持不变。例如，与对照植物相比，处理过的植物谷物中的蛋白质含量明显更高；当PGPR与AMF一起接种时，获得最大值。在含有菌根接种物的处理中，AMF引起的根部定植百分比显着高于未处理的对照，并且不受PGPR处理的影响。总之，小麦根瘤菌群落结构是高度动态的，并受诸如植物的年龄，肥料的投入和生物抑制剂的类型等不同因素的影响。另外，根对细菌群落具有距离相关的作用。最后，将产生二乙酰基间苯三酚的PGPR菌株和AMF联合生物接种可协同提高谷物的营养品质，而不会对菌根生长产生负面影响。

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