Uptake, distribution and redistribution of 15nitrogen by Vicia faba under field conditions

Improvements in nutrient uptake and nutrient use-efficiency in cotton cultivars released between 1973 and 2006

“…Determinate grain crops redistribute nutrients during grain-filling; 50-83% of seed N may be attributed to N taken up before flowering (faba bean - Dekhuijzen and Verkerke, 1984;maize -Pan et al, 1986;sunflower -Hocking and Steer, 1995). For cotton, available data show 10-45% of N in bolls was from redistribution (Halevy, 1976;Oosterhuis et al, 1983;Rosolem and Mikkelsen, 1991;Zhu and Oosterhuis, 1992;Errington et al, 2009).…”

Dynamics of Exogenous Nitrogen Partitioning and Nitrogen Remobilization from Vegetative Organs in Pea Revealed by 15N in Vivo Labeling throughout Seed Filling

“…In soybean, at an early seed-filling stage, the reproductive parts of the plants attracted 40% of the exogenous N, which increased to 60% during seed filling (Warembourg and Fernandez, 1985). Seeds were also the main sink for exogenous N during filling in Brassica napus (Malagoli et al, 2005), bean (Westermann et al, 1985), and V. faba (Dekhuijzen and Verkerke, 1984).…”

“…However, exogenous N cannot generally sustain the high N demand of filling seeds, so endogenous N previously accumulated in vegetative parts is largely remobilized to fulfill this demand (Sinclair and de Wit, 1976;Salon et al, 2001). Seed N concentration is correlated to N availability within plants, and the extent of the contribution of N remobilization to seed N yield varies among legumes: 70% in field-grown pea (Atta et al, 2004), 80% to 90% in soybean (Glycine max; Warembourg and Fernandez, 1985;Grandgirard, 2002), 43% to 94% in rain-fed grown lentil (Lens culinaris; Kurdali et al, 1997), 84% in bean plants (Phaseolus vulgaris;Westermann et al, 1985), and 80% in Vicia faba (Dekhuijzen and Verkerke, 1984). Despite this knowledge, N repartition during seed filling within legume plants and in particular within pea plants has not yet been well characterized.…”

“…At a particular stage of plant development, such as vegetative growth, flowering, or beginning of seed filling, 15 N-labeled N was applied during a given time span from 1 d (Warembourg and Fernandez, 1985) to 1 week (Dekhuijzen and Verkerke, 1984). Nitrogen remobilization was then estimated from 15 N redistribution at a given time after labeling.…”

“…The partitioning of newly assimilated N within plants has been estimated using pulse-chase 15 N labeling for pea (Atta et al, 2004), common bean (Westermann et al, 1985), soybean (Warembourg and Fernandez, 1985), and V. faba (Dekhuijzen and Verkerke, 1984). At a particular stage of plant development, such as vegetative growth, flowering, or beginning of seed filling, 15 N-labeled N was applied during a given time span from 1 d (Warembourg and Fernandez, 1985) to 1 week (Dekhuijzen and Verkerke, 1984).…”