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© 1989 Oxford University Press

RESEARCH-ARTICLE

Interactions between Root Temperature and Nitrogen Deficiency Influence Preferential Uptake of NH+4 and NO–3 by Oilseed Rape

J. H. MACDUFF1 and A. WILD

Department of Soil Science, The University of Reading London Road, Reading RG1 5AQ, UK

1 To whom correspondence should be addressed at: AFRC Institute for Grassland and Animal Productin. Hurley. Maidenhead, Berks. SL6 5LR, UK.

Oilseed rape (Brassica napus L. cv. Bien venu) plants were grown in a system of flowing solution culture and pre-treated at root temperatures of 3 °C or 13 °C for 7 d with or without N supplied as 10 mmol m–3 NH4NO3. Subsequently, N was re-supplied and root temperatures were reversed for 7 d. Shoot temperatures were common at 20/15 °C day/night. Net uptake of , and K+, leaf area, root length, and transpiration were measured and compared with control plants having root temperatures of 3 °C and 13 °C throughout. Plants that were continuously supplied with N and pre-treated at 3 °C showed a 50% increase in total uptake of , and measured at 13 °C over 7 d compared with control plants at 3°C, but uptake of was 28% lower and uptake of was 43% higher than that shown by control plants at 13 °C. Pre-treatment at 3 °C did not enhance the subsequent uptake of total N or of K+ at 13 °C relative to the 13 °C control. Transpiration rates at 3 °C were on average 70% of those at 13 °C. The concentration of total N in plants was halved after 7 d without a supply of N, but total dry matter production was not significantly affected. N starvation also increased the temperature sensitivity of subsequent uptake relative to that of uptake. After N starvation at 13 °C the uptake of and measured at 13 °C was 50% higher over 7 d than that measured under continuous N supply. In contrast, after N starvation at 3 °C the uptake of at 3 °C was 70% less, whilst uptake was 50% more than the respective totals absorbed by plants that were continuously supplied with N at 3 °C. After N starvation the uptake of was generally 40–60% of the daily total N uptake, compared with 60–80% in plants continuously supplied with N.

Key words: Brassica napus, oilseed rape, root temperature, nitrate, ammonium, potassium, N-deficiency, ion uptake rate, transpiration


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