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首页> 外文期刊>Soil Biology & Biochemistry >Calcium affects the competitiveness of acid-sensitive and acid-tolerant strains of Bradyrhizobium japonicum in nodulating and fixing nitrogen with two soybean cultivars in acid soil
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Calcium affects the competitiveness of acid-sensitive and acid-tolerant strains of Bradyrhizobium japonicum in nodulating and fixing nitrogen with two soybean cultivars in acid soil

机译：钙影响酸性土壤中两个大豆品种根瘤菌固氮对酸敏感和耐酸菌株的竞争性

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摘要

A glasshouse experiment studied the role of calcium and pH on competitiveness of acid-sensitive and acid-tolerant Bradyrhizobium japonicum strains with similar N-2-fixation effectiveness in nodulating two soybean (Glycine max L. Merr) cultivars selected for tolerance of aluminium (PI416937) or for manganese (Manta). Liming provides calcium (Ca) as well as increasing soil pH. Thus the effect of Ca and pH of soil are difficult to separate. We examined the effects of Ca per se by comparing the response to gypsum and lime amendment on the competitiveness of acid-tolerant and acid-sensitive strains in nodulating soybean in an acid soil. Acid soil was treated with either CaSO4 or CaCO3 and incubated for 2 weeks before sowing soybean seed. Two acid-sensitive and two acid-tolerant B. japonicum strains were mixed with each other (one acid-sensitive plus one acid-tolerant) and were inoculated onto soybean seeds at the rate of 10(6)cfu seed(-1). Soil pH, as amended by lime addition, had more effect on nodulation than Ca addition in the form of gypsum. The response was affected by cultivar and strain in a complicated fashion with a marked strain x cultivar interaction. One acid-tolerant strain formed most nodules with both cultivars in the unamended soil of pH 4.36 in competition with one acid-sensitive strain. The same acid-tolerant strain was not competitive against the second acid-sensitive strain with Manta but was with PI416937. The second acid-tolerant strain was not competitive with either acid-sensitive strain in unamended and gypsum treated soils. It was only competitive with PI416937 in limed soil, a rather surprising result. Inoculation of this soil with no native soybean nodulating strains, increased shoot weight, %N, N uptake. N-2-fixation was greatly increased by inoculation and lime addition, and to a lesser extent by gypsum addition for Manta. This experiment indicates that addition of Ca per se as gypsum to an acid soil has little effect on symbiotic performance, but changing pH by liming has a major effect, that both soybean cultivar and B. japonicum strain influence the competitiveness of strains in acid soil and that acid-tolerance does not necessarily increase a strain's competitiveness
机译：温室试验研究了钙和pH值对耐酸和耐酸的日本根瘤菌（Bradyrhizobium japonicum）菌株竞争性的作用，这些菌株具有相似的N-2固定功效，其根瘤选择的两个大豆（Glycine max L. Merr）耐铝品种（PI416937） ）或锰（曼塔）。石灰提供钙（Ca）并增加土壤pH值。因此，钙和土壤pH值的影响很难分开。我们通过比较对石膏和石灰改良剂对酸性土壤中大豆根瘤菌中耐酸和酸敏感菌株的竞争性的反应，来研究钙本身的影响。用CaSO4或CaCO3处理酸性土壤，并在播种大豆种子之前孵育2周。将两种耐酸和耐酸的日本双歧杆菌菌株彼此混合（一种耐酸和一种耐酸），并以10（6）cfu种子（-1）的比例接种到大豆种子上。通过添加石灰来修正土壤pH值，对土壤结瘤的影响要比以石膏形式添加钙对结瘤的影响更大。响应受品种和菌株的影响，且具有复杂的菌株x品种相互作用。一株耐酸菌株在未经修饰的pH值为4.36的土壤中与两个品种形成了大多数结节，与一种酸敏感性菌株竞争。相同的耐酸菌株对Manta的第二种酸敏感性菌株没有竞争性，但与PI416937竞争。在未经改良和经石膏处理的土壤中，第二种耐酸菌株与任何一种酸敏感性菌株都不具有竞争性。它仅在石灰土中与PI416937竞争，这是一个令人惊讶的结果。在没有天然大豆结瘤菌株的情况下接种该土壤，会增加苗重，％N，N吸收。接种和添加石灰大大增加了N-2-固定，而通过添加Manta的石膏使N-2-固定增加了。该实验表明，将钙本身作为石膏添加到酸性土壤中对共生性能影响不大，但是通过撒石灰改变pH值具有重要作用，大豆品种和日本芽孢杆菌菌株都影响酸性土壤中菌株的竞争性。耐酸并不一定能提高菌株的竞争力

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