Effects of root temperature on uptake of nitrate and ammonium ions by barley grown in flowing-solution culture |
| |
Authors: | J. H. MacDuff M. J. Hopper |
| |
Affiliation: | (1) Department of Soil Science, University of Reading, RG1 5AQ Reading, UK;(2) Animal and Grassland Research Institute, SL6 5LR Hurley, Berks, UK |
| |
Abstract: | Summary Barley plants (Hordeum vulgare L.) grown from seed for 28 days in flowing solution culture were subjected to different root temperatures (3, 5, 7, 9, 11, 13, 17, 25°C) for 14 days with a common air temperature of 25/15°C (day/night). Uptake of NH4 and NO3 ions was monitored separately and continuously from solutions maintained at 10 M NH4NO3 and pH 6.0. Effects of root temperature on unit absorption rate, flux and inflow were compared. After 5 days, and increased with temperature over the range 3–11°C for NH4 ions and over the range 3–13°C for NO3 ions, with little change for either ion above these temperatures. Q10 temperature coefficients for NH4 ions (3–13°C) were 1.9, 1.7 and 1.6 for, and respectively, the corresponding values for NO3 ions being 5.0, 4.5 and 4.6. For both ions,, and changed with time as did their temperature dependence over the range 3–25°C, suggesting that rates of ontogenetic development and the extent of adaptation to temperature may have varied among treatments. |
| |
Keywords: | Ammonium uptake Barley Flowing-solution culture Hordeum vulgare L. Nitrate uptake Root temperature |
本文献已被 SpringerLink 等数据库收录! |
|