ISSN:
1573-5036
Keywords:
Ammonium uptake
;
Barley
;
Flowing-solution culture
;
Hordeum vulgare L.
;
Nitrate uptake
;
Root temperature
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
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 μM NH4NO3 and pH 6.0. Effects of root temperature on unit absorption rate $$\bar S$$ , flux $$\bar F$$ and inflow $$\bar I$$ were compared. After 5 days $$\bar S$$ , $$\bar F$$ and $$\bar I$$ 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 $$\bar S$$ , $$\bar F$$ and $$\bar I$$ respectively, the corresponding values for NO3 ions being 5.0, 4.5 and 4.6. For both ions, $$\bar S$$ , $$\bar F$$ and $$\bar I$$ 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02198112
