Mobilization of leaf N in soybean genotypes with varying durations of seedfill

Physiological and management factors contributing to soybean potential yield

“…Genotypes with a short EFP require a more rapid N remobilization from the leaves to support seed protein accumulation when compared with genotypes with a longer EFP (Boon-Long et al, 1983;Egli et al, 1987). A short EFP was also associated with a more rapid rate of decline in CO 2 uptake and earlier leaf abscission (Boon-Long et al, 1983;Gay et al, 1980).…”

Effects of the 'Stay Green' Genotype GGd1d1d2d2 on Leaf Gas Exchange, Dry Matter Accumulation and Seed Yield in Soybean (Glycine max L. Merr.)

“…Extending the eective seed ®lling period requires the maintenance of an active photosynthetic canopy; therefore, the length of the ®lling period is partly related to green leaf area duration. For example, the decrease in leaf N content (which correlates with a decline in photosynthesis) associated with senescence proceeds at a slower rate in soybean cultivars with long seed ®lling periods (Egli et al, 1987). Likewise, maize genotypes with extended green leaf area duration have longer grain ®lling periods and higher kernel yields (Crafts-Brandner and Poneleit, 1987).…”

Physiological bases of environmental and genotypic effects on soybean seed composition

“…Numerous whole-plant studies have sought to associate final seed protein concentration with assimilate supply during seed filling Leffel et al, 1992;Burton et al, 1995;Naeve et al 2008). Typically, leaf area (m 2 m -2 ) or leaf nitrogen (mg N m -2 ) at R5 has been used as a surrogate for assimilate supply, since leaves are a primary source of carbon and nitrogen accumulated by the seed at maturity (Egli et al, 1987;. Also, leaf area approaches a maximum at R5 and therefore sets the potential for capturing photosynthetic assimilate available for seed growth (Kumudini et al, 2001).…”