The quantity of nitrogen derived from symbiotic N fixation but not the relative contribution of N fixation to total N uptake increased with breeding for greater soybean yields

被引:12
|
作者
Donahue, Janelle M. [1 ]
Bai, Hua [2 ]
Almtarfi, Hussien [1 ,4 ]
Zakeri, Hossein [3 ]
Fritschi, Felix B. [1 ]
机构
[1] Univ Missouri, Div Plant Sci, Columbia, MO 65211 USA
[2] Northwest Missouri State Univ, Sch Agr Sci, Maryville, MO 64468 USA
[3] Calif State Univ Chico, Coll Agr, Chico, CA 95929 USA
[4] Univ Wasit, Dept Crop Sci, Coll Agr, Wasit 00964, Iraq
关键词
Nodulation; BNF; YOR; Genotypic variation; X MANAGEMENT INTERACTIONS; SHORT-SEASON SOYBEANS; GENETIC-IMPROVEMENT; SOIL-NITROGEN; N-2; FIXATION; NITRATE; NODULATION; SELECTION; GAIN; REMOBILIZATION;
D O I
10.1016/j.fcr.2020.107945
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Long-term soybean [Glycine max (L) Merr.] breeding for yield has increased plant nitrogen (N) demands. On one hand, because N fertilizer application in soybean production systems continues to be insignificant, increased plant N demands over time may have been satisfied from greater biological N fixation (BNF). On the other hand, increased soil residual N over time may have affected the sensitivity of nodulation and BNF. To understand the impact of breeding for greater yield and the effect of soil residual N on nodulation and BNF, two field and a greenhouse study were conducted. Field studies were conducted with maturity group IV soybean cultivars released from 1930 to 2005 and included experiments in four environments. Total shoot N and N from BNF increased with cultivar year of release in two of the four environments. Simulation of different levels of residual soil mineral N by application of 0, 34, 67, and 101 kg N ha(-1) shortly after planting resulted in linear increases in shoot N content and delta N-15, and linear decreases in nodule number and nodule dry matter in the field. Consistent with these results, fertigation of greenhouse-grown soybean cultivars with different levels of NH4NO3 led to a reduction in nodule number, dry matter, and size. Overall, results from these studies indicate that increases in seed yields with cultivar year of release were associated with greater amounts of N derived from BNF as well as greater total shoot N accumulation, but the relative contribution of BNF to total shoot N did not change over time. Analysis also suggest that the sensitivity of nodulation and BNF to soil mineral N has not been altered over the course of soybean breeding.
引用
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页数:10
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