Temperature effect on leaf water deuterium enrichment and isotopic fractionation during leaf lipid biosynthesis: Results from controlled growth of C(3) and C(4) land plants
Zhou, YP (Zhou, Youping)[1,2,3,4]; Grice, K (Grice, Kliti)[1]; Chikaraishi, Y (Chikaraishi, Yoshito)[5]; Stuart-Williams, H (Stuart-Williams, Hilary)[2]; Farquhar, GD (Farquhar, Graham D.)[2]; Ohkouchi, N (Ohkouchi, Naohiko)[5]
2011-02-28
发表期刊PHYTOCHEMISTRY
卷号72期号:2-3页码:207-213
文章类型期刊论文
摘要

The hydrogen isotopic ratios ((2)H/(1)H) of land plant leaf water and the carbon-bound hydrogen of leaf wax lipids are valuable indicators for climatic, physiological, metabolic and geochemical studies. Temperature will exert a profound effect on the stable isotopic composition of leaf water and leaf lipids as it directly influences the isotopic equilibrium (IE) during leaf water evaporation and cellular water dissociation. It is also expected to affect the kinetics of enzymes involved in lipid biosynthesis, and therefore the balance of hydrogen inputs along different biochemical routes. We conducted a controlled growth experiment to examine the effect of temperature on the stable hydrogen isotopic composition of leaf water and the biological and biochemical isotopic fractionations during lipid biosynthesis. We find, that leaf water (2)H enrichment at 20 degrees C is lower than that at 30 degrees C. This is contrary to the expectation that at lower temperatures leaf water should be more enriched in (2)H due to a larger equilibrium isotope effect associated with evapotranspiration from the leaf if all other variables are held constant. A hypothesis is presented to explain the apparent discrepancy whereby lower temperature-induced down-regulation of available aquaporin water channels and/or partial closure of transmembrane water channel forces water flow to "detour" to a more convoluted apoplastic pathway, effectively increasing the length over which diffusion acts against advection as described by the Peclet effect (Farquhar and Lloyd, 1993) and decreasing the average leaf water enrichment. The impact of temperature on leaf water enrichment is not reflected in the biological isotopic fractionation or the biochemical isotopic fractionation during lipid biosynthesis. Neither the biological nor biochemical fractionations at 20 degrees C are significantly different from that at 30 degrees C, implying that temperature has a negligible effect on the isotopic fractionation during lipid biosynthesis.

关键词Leaf water Lipids Hydrogen isotope Temperature effect Isotope fractionation
DOI10.1016/j.phytochem.2010.10.022
收录类别SCI
语种英语
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被引频次:43[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ieecas.cn/handle/361006/10339
专题黄土与第四纪地质国家重点实验室(2010~)
通讯作者Zhou, YP (Zhou, Youping)[1,2,3,4]
作者单位1.WA-Organic and Isotopic Geochemistry Centre, Department of Chemistry, Curtin University, Perth, Australia;
2.RSB, Australian National University, Canberra, ACT 2601, Australia;
3.State Key Laboratory of Loess and Quaternary Geology, IEE, CAS, Xi’an 710075, China;
4.RSES, Australian National University, Canberra, ACT 0200, Australia;
5.Institute of Biogeosciences, JAMESTEC, Natushima-cho 2-15, Yokosuka, Kanagawa 237-0061, Japan
推荐引用方式
GB/T 7714
Zhou, YP ,Grice, K ,Chikaraishi, Y ,et al. Temperature effect on leaf water deuterium enrichment and isotopic fractionation during leaf lipid biosynthesis: Results from controlled growth of C(3) and C(4) land plants[J]. PHYTOCHEMISTRY,2011,72(2-3):207-213.
APA Zhou, YP ,Grice, K ,Chikaraishi, Y ,Stuart-Williams, H ,Farquhar, GD ,&Ohkouchi, N .(2011).Temperature effect on leaf water deuterium enrichment and isotopic fractionation during leaf lipid biosynthesis: Results from controlled growth of C(3) and C(4) land plants.PHYTOCHEMISTRY,72(2-3),207-213.
MLA Zhou, YP ,et al."Temperature effect on leaf water deuterium enrichment and isotopic fractionation during leaf lipid biosynthesis: Results from controlled growth of C(3) and C(4) land plants".PHYTOCHEMISTRY 72.2-3(2011):207-213.
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