Daryanto, StefaniWang, LixinGilhooly, William P., IIIJacinthe, Pierre-André2018-12-072018-12-072018-03Daryanto, S., Wang, L., Gilhooly, W. P., & Jacinthe, P.-A. (2018). Nitrogen preference across generations under changing ammonium nitrate ratios. Journal of Plant Ecology. https://doi.org/10.1093/jpe/rty014https://hdl.handle.net/1805/17942Aims Nitrogen (N) in natural environments is typically supplied by a mixture of ammonia (NH4+) and nitrate (NO3−). However, factors that underlie either NH4+ or NO3− preference, and how such preference will change across generations remain unclear. We conducted a series of experiments to answer whether: (i) NH4+:NO3− ratio is the driving factor for plant N preference, and (ii) this preference is consistent across generations. Methods We conducted both: (i) field observations (as a proxy for parent or P generation) and (ii) greenhouse experiments (the first generation or F1 and the second generation or F2) using corn and soybean grown under different NH4+:NO3− ratios. Important Findings Both corn and soybean had the physiological plasticity to prefer either NH4+ or NO3− depending on NH4+:NO3− ratios, and this plasticity was consistent across generations. Corn, however, showed a stronger preference towards NO3− while soybean showed a stronger preference towards NH4+. While both plants would try to make use of the most available form of N in their growing medium, plant species, physiological characteristics (e.g. maturity) and plant nutrient status also determined the extent of N uptake. From the evolutionary and productivity perspective, this plasticity is beneficial, allowing plants to effectively acquire available N particularly in a changing climate.enPublisher Policyclimate changefilialisotopeArticle