Effect of CO2 Concentration, Temperature and N Fertilization on Biomass Production of Soybean Genotypes Differing in N Fixation Capacity
Effect of CO2 Concentration, Temperature and N Fertilization on Biomass Production of Soybean Genotypes Differing in N Fixation Capacity
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DOI：
10.1626/pps.12.156
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发表时间：
2009-04-01
影响因子：
2.5
通讯作者：
Okada, Masumi
中科院分区：
文献类型：
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作者：
Matsunami, Toshinori;Otera, Masafumi;Okada, Masumi
我们测试了这样的假设，即在具有更高的固氮能力的基因型中，增加CO2浓度[CO2]对大豆生物量的促进作用更大。此外，我们还分析了氮肥、温度和[CO2]对生物量生产的交互影响。在盆栽条件下(2004、2005)，在盆栽条件下分别种植了3种与水稻结瘤相关的基因类型：Enrei(正常结瘤基因)、Kanto 100(超结瘤基因)和EN 1282(非结瘤基因)。然后，他们受到两种不同的[二氧化碳](环境和升高(环境+200 Mol-1))×两种温度(低、高(低+4，相当于5摄氏度))的影响。成熟期最高干重在高[CO2]x高温条件下最大，与基因型和施氮量无关。在营养生长期，[CO2]升高普遍促进了大豆对N的吸收和干物质生产，且结瘤基因型(Enrei和Kanto 100)的促进作用比非结瘤基因型(En1282)更明显，说明通过固氮提供氮素有助于提高[CO2]诱导的大豆生物量生产。然而，超结瘤类型的生物量对升高的[CO2]的相对响应度不一定高于正常结瘤类型。超结瘤类型的氮素利用效率低于正常结瘤和非结瘤类型。这些结果并没有完全验证这样的假设，即在具有较高固氮能力的基因型中，高[CO2]诱导的大豆生物量产量的提高更大。
We tested the hypothesis that elevated CO2, concentration [CO2]-induced enhancement of biomass production of soybean is greater in a genotype that has a higher nitrogen (N) fixation capacity. Furthermore, we analyzed the interactive effects of N fertilization, temperature and [CO2] on biomass production. Three genetically related genotypes: Enrei (normally-nodulating genotype), Kanto 100 (supernodulating genotype), and En 1282 (non-nodulating genotype) were grown in pots, with or without N fertilizer for two years (2004, 2005). They were then subjected to two different [CO2] (ambient and elevated (ambient+200 mu mol mol(-1))) x two temperature regimes (low, high (low+4 similar to 5 degrees C)). Top dry weight at maturity was the greatest in the elevated [CO2] x high temperature regime, irrespective of genotype and N fertilization. The [CO2] elevation generally enhanced N acquisition and dry matter production during the vegetative growth stage, and the enhancement was more pronounced in the nodulating genotypes (Enrei and Kanto 100) than in the non-nodulating genotype (En1282), indicating that N supply through N fixation contributes to elevated [CO2]induced biomass production in soybean. However, the relative responsiveness of biomass production to elevated [CO2] was not necessarily higher in the supernodulating genotype than the normally-nodulating genotype. The N utilization efficiency to produce biomass was inferior in the supernodulating genotype than in the normally-nodulating and non-nodulating genotypes. These results did not fully verify the hypothesis that elevated [CO2]-induced enhancement of biomass production of soybean is greater in a genotype with a higher N fixation capacity.