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Impact of temperature on the relationship between respiration and nitrogen concentration in roots: an analysis of scaling relationships, Q(10) values and thermal acclimation ratios

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JournalNew Phytologist
DatePublished - 2007
Issue number1
Volume173
Number of pages11
Pages (from-to)110-120
Original languageEnglish

Abstract

The impact of nitrogen (N) supply on the temperature response of root respiratory O-2 uptake (R) was assessed in several herbaceous species grown in solution culture. Warm-grown (25 : 20 degrees C, day:night) plants differing in root N concentration were shifted to 13 : 8 degrees C for 7 d to cold-acclimate.

Log-log plots of root R vs root N concentration both showed that R increased with increasing tissue N concentration, irrespective of the growth temperature. Although the regression slopes of the log-log plots did not differ between the warm-grown and cold-acclimated plants, cold-acclimated plants did exhibit a higher y-axis intercept than their warm-grown counterparts. This suggests that cold acclimation of root R is not entirely dependent on cold-induced increases in tissue N concentration and that scaling relationships (i.e. regression equations fitted to the log-log plots) between root R and N concentration are not fixed.

No systematic differences were found in the short-term Quo (proportional change in R per 10 degrees C change in temperature), or degree of cold acclimation (as measured by the proportional difference between warm- and cold-acclimated roots) among roots differing in root N concentration. The temperature response of root R is therefore insensitive to tissue N concentration.

The insensitivity of Q(10) values and acclimation to tissue N concentration raises the possibility that root R and its temperature sensitivity can be predicted for a range of N supply scenarios.

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    Research areas

  • acclimation, nitrogen, Q(10), root respiration, scaling relationships, temperature, RELATIVE GROWTH-RATE, ARABIDOPSIS-THALIANA LEAVES, DARK RESPIRATION, PATHWAY RESPIRATION, PLANT RESPIRATION, SPECIES DIFFER, USE EFFICIENCY, RAIN-FOREST, LEAF-AREA, PHOTOSYNTHESIS

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