Distribution of assimilated carbon within the plant and rhizosphere of Lolium perenne: Influence of temperature

A A Meharg, K Killham

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Abstract

Perennial rye-grass plants were pulse labelled with [14C]-CO2 over a range of temperatures (5–25°C). The fate of the label was determined within the plant and soil. The temperature at which plants were pulse labelled had a marked effect on the distribution of the label within the plant and soil system. Root-soil respiration increased from 5.7 to 24.15% when expressed as a percentage of net assimilated label. The percentage of label remaining in the plant root and in the soil was greater at 5 and 25°C, with a minimum for both these components at 15°C. At 15°C the percentage of net assimilated label that remained in the shoots was greater than at other temperatures, with this percentage decreasing at the lower and higher temperatures.
Original languageEnglish
Pages (from-to)487-489
Number of pages3
JournalSoil Biology and Biochemistry
Volume21
Issue number4
DOIs
Publication statusPublished - 1989

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