Relationships between Root Temperature and the Transport of Ammonium and Nitrate Ions by Italian and Perennial Ryegrass (Lolium multiflorum and Lolium perenne)
Open Access
- 1 October 1979
- journal article
- research article
- Published by Oxford University Press (OUP) in Plant Physiology
- Vol. 64 (4), 557-561
- https://doi.org/10.1104/pp.64.4.557
Abstract
At root temperature below 14 C the absorption of 15N from NH4+ greatly exceeded that from NO2− by tillers of Lolium multiflorum and Lolium perenne under conditions where pH, external concentration, plant N status, and pretreatment temperature were varied. There was a marked increase in the temperature sensitivity of NO3− transport below 14 C, irrespective of the temperature at which plants were grown previously. A marked increase in the temperature sensitivity was also seen for NH4+ transport, but this occurred at the lower temperature of 10 C. Pretreatment of roots at 8 C lowered this still further to 5 C. Above and below these transition temperatures the Q10 values for NO3− and NH4+ transport were similar. Thus, the increased absorption of NH4+ relative to NO3− at low temperatures seems to be related primarily to the difference in transition temperatures.This publication has 4 references indexed in Scilit:
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