Impact of temperature on the relationship between respiration and nitrogen concentration in roots:: an analysis of scaling relationships, Q10 values and thermal acclimation ratios
Impact of temperature on the relationship between respiration and nitrogen concentration in roots:: an analysis of scaling relationships, Q10 values and thermal acclimation ratios
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DOI：
10.1111/j.1469-8137.2006.01891.x
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发表时间：
2007-01-01
期刊：
影响因子：
9.4
通讯作者：
Atkin, Owen K.
中科院分区：
文献类型：
--
作者：
Atkinson, Lindsey J.;Hellicar, Martin A.;Atkin, Owen K.
在水培条件下，研究了氮素供应对几种草本植物根系呼吸O-2吸收（R）温度响应的影响。温暖生长（25：将根系氮浓度不同的植株移至13：8 ℃冷驯化7 d，根系R与根系氮浓度的双对数图均表明，无论生长温度如何，根系R均随组织氮浓度的增加而增加。虽然对数-对数图的回归斜率在温暖生长和冷驯化的植物之间没有差异，但冷驯化的植物确实表现出比温暖生长的植物更高的y轴截距。这表明，根R的冷驯化并不完全依赖于冷诱导的组织N浓度的增加，根R与N浓度之间的相关系数（即双对数回归方程）并不固定，短期Quo（每10 ℃温度变化R的比例变化），或根N浓度不同的根之间的冷驯化程度（通过温暖和冷驯化根之间的比例差异来测量）。根R的温度响应对组织N浓度不敏感，Q（10）值的不敏感性和对组织N浓度的适应性提高了根R及其温度敏感性在一系列供氮情景下可以预测的可能性。
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.