Enhancing crop legume N2 fixation through selection and breeding

Herridge, D. F.; Danso, S. K. A.

doi:10.1007/bf00032241

Cited by 64 publications

(18 citation statements)

References 143 publications

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“…Studies suggest that a host-plant's interaction with rhizobia is a heritable trait that may be modified in plant breeding programmes (Herridge & Danso 1995;Devine & Kuykendall 1996;Herridge et al 2001). Therefore, sanction ability (strength and sensitivity) may vary among legume genotypes, depending on the natural or artificial selection pressures to which their ancestors were exposed.…”

Section: Introductionmentioning

confidence: 99%

Human selection and the relaxation of legume defences against ineffective rhizobia

2007

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Enforcement mechanisms are thought to be important in maintaining mutualistic cooperation between species. A clear example of an enforcement mechanism is how legumes impose sanctions on rhizobial symbionts that fail to provide sufficient fixed N 2 . However, with domestication and breeding in high-soil-N environments, humans may have altered these natural legume defences and reduced the agricultural benefits of the symbiosis. Using six genotypes of soya beans, representing 60 years of breeding, we show that, as a group, older cultivars were better able to maintain fitness than newer cultivars (seed production) when infected with a mixture of effective and ineffective rhizobial strains. Additionally, we found small differences among cultivars in the ratio of effective : ineffective rhizobia released from their nodules, an indicator of future rhizobial strain fitness. When infected by symbionts varying in quality, legume defences against poor-quality partners have apparently worsened under decades of artificial selection.

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Section: Introductionmentioning

confidence: 99%

Human selection and the relaxation of legume defences against ineffective rhizobia

2007

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“…Similar results were reported by Carpenter-Boggs et al (2000), Kessel and Hartley (2000) and Yusuf et al (2009a), who also showed that growing legumes could increase total soil N and net N mineralization. Legume residues make major contributions to the soil organic matter pool (Schwenke et al, 2002), enhance the potential for N mineralization (Wani et al, 1995) and increase soil mineral N (Herridge and Danso, 1995;Chalk, 1998;Rochester and Peoples, 2005).…”

Section: Soil N and Zn Concentrationsmentioning

confidence: 99%

Effects of planting soybean in summer fallow on wheat grain yield, total N and Zn in grain and available N and Zn in soil on the Loess Plateau of China

Yang

Wang

Gao

et al. 2014

European Journal of Agronomy

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a b s t r a c tDryland wheat is the major contributor to wheat production in the world, where water deficiency and poor soil fertility are key factors limiting wheat grain yields and nutrient concentrations. A field experiment was carried out from June 2008 to June 2011 at Shilipu (latitude 35.12 • N, longitude 107.45• E and altitude 1200 m above sea level) on the Loess Plateau (a typical dryland) in China, to investigate the effects of rotation with soybean (Glycine max) green manure (GM) on grain yield, total N and total Zn concentrations in subsequent wheat (Triticum aestivum L.), and on nitrate-N and available Zn in the soil. The benefits of crop rotation with soybean GM on wheat grain yields became more evident with time. In the second and third years, the grain yields of wheat rotated with soybean GM reached 4871 and 5089 kg ha −1 at the 108 kg N ha −1 rate. These yields were 21% and 12% higher than the highest yields of wheat under a fallow-winter wheat (FW) rotation. Rotation with soybean GM reduced the amount of N fertilizer required to obtain wheat grain yields and biomass levels similar to wheat grown in the FW rotation by 20-33%. In the first 2 years, average grain N concentrations over all N rates increased by 6% and 12%, and those of Zn increased by 26% and 14% under the soybean GM-winter wheat (SW) rotation, compared with the FW rotation. The increased grain N and Zn concentrations were found to be related to the increased concentrations of nitrate-N and available Zn in the soil, particularly at the sowing of winter wheat. However, grain N and Zn concentrations were not improved by rotation with soybean GM in the third year. This was attributed to the dilution effect caused by the more grain yield increase than its nutrient export. In conclusion, planting soybean for GM in fallow fields reduced the need for N fertilizer to enhance wheat yields in this dryland region. Change in wheat grain N and Zn concentrations was related to soil nutrient concentrations, and to the balance between increased grain yield and its nutrient export.

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“…Herridge and Danso [3] have outlined several methods to estimate the ability of legumes to carry out BNF. These methods are: (a) difference method, i.e.…”

Section: Introduction * * * *mentioning

confidence: 99%

“…bacteria. These bacteria are capable of absorbing N 2 from their environment and convert it to nitrate (NO 3 ). This N-source is subsequently used by the legumes, which act as the host plants.…”

Section: Introduction * * * *mentioning

confidence: 99%

Measuring the BNF of Soybean Using <sup>15</sup>N-Labelled Urea with Different Atom Excess (A.E.) Content

2013

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The soybean is a legume which has an ability to supply its major nitrogen need by the biological nitrogen fixation (BNF) process. This process is made possible by nodules formed in their roots, colonized by Rhizobium sp.bacteria. An accurate estimation of N gained by BNF is necessary to predict the increase or decrease of chemical fertilizer-N requirements to increase soybean production. Among several methods, the 15 N method was used to estimate the ability of legumes to perform BNF. The study involved soybean var. Willis (W) and a completely non-BNF soybean var. CV, which is termed as a standard crop. The standard crop is nonnodulated soybean, but it has the same main physiological traits with var. Willis. The aim of this study was to determine whether 15 N-labelled fertilizer with different %a.e. given to nodulated and non-nodulated soybean would not be of significant consequences for the calculation of N-BNF of W. The treatments applied were different rates of urea (20 kg N/ha and 100 kg N/ha) combined with different atom excess percentages (%a.e.) 15 N (2% and 10%). Thus, the combination of treatments were as follows:(1) W-ll (20 kg N; 2% a.e); (2) CV-hl (100 kg N; 2% a.e); (3) W-lh (20 kg N; 10% a.e); (4) CV-hh (100 kg N; 10% a.e); (5) CV-ll (20 kg N; 2% a.e); (6) W-hl (100 kg N; 2% a.e); (7) CV-lh (20 kg N; 10% a.e); (8) W-hh (100 kg N; 10% a.e). The result of the experiment showed that a high %a.e. with a low rate of 15 N and a low %a.e. with a high rate of N should be used to study the %N-BNF of nodulated plants.

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Enhancing crop legume N2 fixation through selection and breeding

Abstract: Introduction

Cited by 64 publications

References 143 publications

Human selection and the relaxation of legume defences against ineffective rhizobia

Human selection and the relaxation of legume defences against ineffective rhizobia

Effects of planting soybean in summer fallow on wheat grain yield, total N and Zn in grain and available N and Zn in soil on the Loess Plateau of China

Measuring the BNF of Soybean Using <sup>15</sup>N-Labelled Urea with Different Atom Excess (A.E.) Content

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