Efflux and assimilation of xylem-transported CO2 in stems and leaves of tree species with different wood anatomy.
Efflux and assimilation of xylem-transported CO2 in stems and leaves of tree species with different wood anatomy.
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具有不同木材解剖结构的树种的茎和叶中木质部运输的二氧化碳的流出和同化。
DOI：
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
K. Steppe
中科院分区：
文献类型：
--
作者：
R. Salomón;Linus De Roo;S. Bodé;P. Boeckx;K. Steppe
确定树木组织中呼吸的CO2的命运对于理解植物呼吸生理和评估CO2再循环机制是必要的。将富含13 C的CO2水溶液注入3-4 m高的树木的茎中，分别通过腔衰荡激光光谱和同位素比质谱来估计木质部运输的CO2的流出和同化。不同的树的位置（下茎，上茎和叶枝）和组织（木质部，树皮和树叶）进行了监测，在物种管胞，弥漫性和环孔木材解剖（雪松，枫树和橡树，分别）。径向木质部CO2扩散率和木质部[CO2 ]较低，雪松相对于枫树和橡树，从而限制标签扩散。部分标记的13 CO2在雪松（8.7%）和橡树（20.6%）中被同化，主要是在木质部和树皮组织的茎，而有限的溶液吸收在枫树阻碍了标记同化的检测。很少的标签到达叶组织，表明大量的标签损失沿着茎-分支过渡减少径向扩散途径。呼吸速率和径向木质部CO2扩散率（针叶树相对于被子植物物种较低）的差异可能会调和的差异，到目前为止观察到的分类分支之间的木质部运输CO2的流出和同化。本文受版权保护。All rights reserved.
Determining the fate of CO2 respired in woody tissues is necessary to understand plant respiratory physiology and to evaluate CO2 recycling mechanisms. An aqueous 13 C-enriched CO2 solution was infused into the stem of 3-4 m tall trees to estimate efflux and assimilation of xylem-transported CO2 via cavity ring down laser spectroscopy and isotope ratio mass spectrometry, respectively. Different tree locations (lower stem, upper stem and leafy shoots) and tissues (xylem, bark and leaves) were monitored in species with tracheid, diffuse- and ring- porous wood anatomy (cedar, maple and oak, respectively). Radial xylem CO2 diffusivity and xylem [CO2 ] were lower in cedar relative to maple and oak trees, thereby limiting label diffusion. Part of the labeled 13 CO2 was assimilated in cedar (8.7 %) and oak (20.6 %) trees, mostly in xylem and bark tissues of the stem, while limited solution uptake in maple trees hindered detection of label assimilation. Little label reached foliar tissues, suggesting substantial label loss along the stem-branch transition following reductions in the radial diffusive pathway. Differences in respiration rates and radial xylem CO2 diffusivity (lower in conifer relative to angiosperm species) might reconcile discrepancies in efflux and assimilation of xylem-transported CO2 so far observed between taxonomic clades. This article is protected by copyright. All rights reserved.
DOI：
10.1111/nph.13737
发表时间：
2016-03
期刊：
The New phytologist
影响因子：
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作者：
Morris H;Plavcová L;Cvecko P;Fichtler E;Gillingham MA;Martínez-Cabrera HI;McGlinn DJ;Wheeler E;Zheng J;Ziemińska K;Jansen S
通讯作者：
Jansen S
影响因子：
6.9
作者：
Stutz SS;Anderson J;Zulick R;Hanson DT
通讯作者：
Hanson DT