Abstract
Abstract Light intensity and NO3 ‐ concentration in aerated nutrient solutions were varied to evaluate the sensitivity of NO3 ‐ assimilation in 1‐year‐old French prune (Prunus domestica L.) cv. Agen budded on Marianna 2624 rootstocks to low irradiance. The uptake and reduction of NO3 ‐ decreased in prune trees within 10 days at 3.2 klx. Foliar [NO3 ‐] increased in darkness but not at 3.2 klx. Thus, foliar [NO3 ‐ ] does not appear to be a potentially useful diagnostic parameter of carbon deprivation under field conditions at incipient stages of light‐limited nitrogen utilization. Free NH4 + and alpha‐amino N also increased in senescing prune leaves during a 25 day dark period.
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