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Variation in symbiotic effectiveness of Bradyrhizobium sp. through plant passage in peanut (Arachis hypogaea L.)

机译：缓生根瘤菌共生功效的变化。通过花生的植物传代（花生）

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摘要

The soil bacteria classified as Bradyrhizobium sp. (Arachis) comprises a heterogeneous group with extensive variability in nitrogen fixation traits when in association with the host plant. The purpose of this work was to evaluate the potential use of plant passage as a method for selection of Bradyrhizobium sp. isolates with superior symbiotic effectiveness on peanut genotypes.;The effects of repeated plant passage of Bradyrhizobium sp. strains on nitrogen fixation in peanut cultivars were investigated in two greenhouse experiments. First, a series of 4 selection cycles were conducted to obtain nodule isolates (germplasm) from each strain/cultivar combination at each cycle. Bradyrhizobium strains 3G4b20, CB756 and 3G4b5 were repeatedly passed on two Arachis hypogaea cultivars Argentine and Florigiant. Each nodule isolate from the cultivar/strain combination were pooled and used as an inoculum source for the next passage. In the second phase, an overall evaluation of plant passage was conducted which included all plant passage isolates and the original strains. The main objective was to compare the symbiotic effectiveness of the Bradyrhizobium isolates obtained in each cycle without the seasonal effect on plant yield observed during the individual selection cycles.;The plant passage isolates derived from Bradyrhizobium strains 3G4b20 and CB756 significantly increased the total nitrogen and plant shoot dry weight of the peanut cultivars Argentine and Florigiant when compared with the original strains. In general, these increases were not correlated with nodule number or nodule mass. The effectiveness of Bradyrhizobium strain 3G4b5 did not significantly change with the plant passages performed.;In the final evaluation of the plant passage study, the influence of plant age on symbiotic effectiveness of plant passage isolates and the amino acid content of nodule cytosol were also investigated. Generally, most of the significant increases in symbiotic effectiveness due to plant passage were confined to cultivar Florigiant when strains 3G4b20 and CB756 were used as inocula. These changes were correlated with the sampling date. Strain 3G4b20 expressed significant changes between 8 and 10 weeks after planting, whereas changes induced by strain CB756 were expressed between 4 and 8 weeks after planting. The levels of the amino acid asparagine were correlated with the increases in nitrogen fixation due to plant passage.
机译：归类为根瘤菌的土壤细菌。 （Arachis）包含与宿主植物结合时在固氮性状上具有广泛差异的异质基团。这项工作的目的是评估潜在的植物传代作为选择Bradyrhizobium sp。的方法。分离株对花生的基因型具有优异的共生功效。在两个温室实验中研究了花生品种中固氮菌菌株。首先，进行一系列的4个选择循环，以在每个循环中从每个菌株/品种组合获得根瘤分离物（种质）。缓生根瘤菌菌株3G4b20，CB756和3G4b5分别在两个Arachis hypogaea品种Argentine和Florigiant上通过。合并来自栽培品种/菌株组合的每个结节分离物，并用作下一次传代的接种源。在第二阶段，对植物传代进行了总体评估，其中包括所有植物传代分离株和原始菌株。主要目的是比较每个周期获得的缓生根瘤菌菌株的共生功效，而没有在各个选择周期中观察到的对植物产量的季节性影响。源自缓生根瘤菌菌株3G4b20和CB756的植物传代菌株显着增加了总氮和植物与原始菌株相比，花生品种阿根廷和佛罗伦种的茎干重。通常，这些增加与结节数或结节质量无关。缓生根瘤菌菌株3G4b5的有效性并未随植物传代而显着变化。；在植物传代研究的最终评估中，还研究了植物年龄对植物传代分离物共生有效性和根瘤细胞溶质氨基酸含量的影响。 。通常，当菌株3G4b20和CB756用作接种物时，由于植物传代而导致的大多数共生功效的显着提高仅限于Florigiant品种。这些变化与采样日期相关。菌株3G4b20在种植后8至10周表达了显着变化，而菌株CB756诱导的变化在种植后4至8周表达。氨基酸天冬酰胺的水平与由于植物传代引起的固氮增加有关。

著录项

  • 作者

    Cassini, Servio Tulio Alves.;

  • 作者单位

    North Carolina State University.;

  • 授予单位 North Carolina State University.;
  • 学科 Microbiology.
  • 学位 Ph.D.
  • 年度 1988
  • 页码 84 p.
  • 总页数 84
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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