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Mechanisms regulating yield determination in supernodulating soybean genotypes

超结大豆基因型产量决定的调控机制

基本信息

批准号：
17380008
负责人：
KOKUBUN Makie
金额：
$ 6.97万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17380008/
关键词：
Crop science Soybean Nitrogen fixation Climate change Dry matter production 物質生産気候変動

项目摘要

In this study, we aimed to verify the hypothesis that elevated [CO_2]-induced enhancement of biomass production of soybean is greater in genotypes that have a higher N fixation capacity. Furthermore, we aimed to identify the interactive effects of N fertilization, temperature, and [CO_2] on biomass production. Genetically related genotypes that have different N fixation capaciry: normally-nodulating genotypes, supernodulating genotypes, and non-nodulating genotypes were grown in pots, with or without N fertilizer. They were then subjected to two different [CO_2] (ambient and elevated (ambient + 200 兪mol mol^<-1>)) x two temperature regimes (low, high (low + 4-5 ?C)). Top dry weight at maturity was the greatest in the elevated [CO_2] x high temperature regime, irrespective of genotype and N fertilization, and was greater in nodulating genotypes than in non-nodulating genotypes. The marked enhancement of biomass production of nodulating genotypes was ascribed to higher leaf expansion rate, which appeared to be associated with its superior N fixing activity. However, the difference in [CO_2]-induced biomass enhancement between supernodulating and normally-nodulating genotypes was not significant. Grain yield was not significantly enhanced by elevated [CO_2] when high temperature was imposed. The physiological mechanisms involved in impaired sink formation under elevated [CO_2] x high temperature conditions remain to be clarified.

在这项研究中，我们旨在验证这样的假设，即高[CO2]诱导的大豆生物量增加在具有较高固氮能力的基因型中更大。此外，我们的目的是确定氮肥、温度和[CO_2]对生物量生产的交互影响。有不同固氮能力的遗传相关基因类型：正常结瘤基因、超结瘤基因和非结瘤基因在盆栽中种植，无论施或不施氮肥。然后，他们被置于两种不同的[CO_2](环境和高温(环境+200兪摩尔摩尔))×两种温度(低、高(低+4-5℃))中。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，结瘤类型大于非结瘤类型。结瘤类型生物量的显著提高归因于较高的叶片展开速率，这似乎与其优越的固氮活性有关。然而，超结瘤和正常结瘤在[CO_2]诱导的生物量增加方面的差异不显著。当施加高温时，增加[CO2]并不能显著提高籽粒产量。在高温条件下，[CO_2]_x升高导致汇形成受损的生理机制仍有待阐明。