CO(2) diffusion in tobacco: a link between mesophyll conductance and leaf anatomy.
CO(2) diffusion in tobacco: a link between mesophyll conductance and leaf anatomy.
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DOI：
10.1098/rsfs.2020.0040
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发表时间：
2021-04-06
期刊：
影响因子：
4.4
通讯作者：
von Caemmerer S
中科院分区：
文献类型：
--
作者：
Clarke VC;Danila FR;von Caemmerer S
叶绿体内羧化位点的 CO2 分压取决于 CO2 从细胞间隙扩散到羧化位点的传导性，称为叶肉传导性 (gm)。我们通过使用可调谐二极管激光光谱法结合气体交换和碳同位素测量，研究了 gm 如何随叶龄和烟草（Nicotiana tabacum）冠层变化。我们将这些测量结果与叶子的解剖特征结合起来。 CO2 同化率、A 和 gm 随着叶子的老化和在冠层中移动的降低而降低，并且呈线性相关。这伴随着巨大的解剖学变化，包括叶子厚度的增加。冠层中每单位叶面积 (Sc) 暴露于细胞间隙的叶绿体表面积也较低。老叶的叶肉细胞壁较厚，gm 与细胞壁厚度成反比。我们得出的结论是，冠层下部老叶的 gm 减少与 Sc 的减少和叶肉细胞壁的增厚有关。
The partial pressure of CO2 at the sites of carboxylation within chloroplasts depends on the conductance to CO2 diffusion from intercellular airspace to the sites of carboxylation, termed mesophyll conductance (gm). We investigated how gm varies with leaf age and through a tobacco (Nicotiana tabacum) canopy by combining gas exchange and carbon isotope measurements using tunable diode laser spectroscopy. We combined these measurements with the anatomical characterization of leaves. CO2 assimilation rate, A, and gm decreased as leaves aged and moved lower in the canopy and were linearly correlated. This was accompanied by large anatomical changes including an increase in leaf thickness. Chloroplast surface area exposed to the intercellular airspace per unit leaf area (Sc) also decreased lower in the canopy. Older leaves had thicker mesophyll cell walls and gm was inversely proportional to cell wall thickness. We conclude that reduced gm of older leaves lower in the canopy was associated with a reduction in Sc and a thickening of mesophyll cell walls.
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影响因子：
7.3
作者：
Niinemets, Ü;Cescatti, A;Tosens, T
通讯作者：
Tosens, T
影响因子：
11.6
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Danila, Florence R.;Quick, William Paul;von Caemmerera, Susanne
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von Caemmerera, Susanne
影响因子：
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作者：
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von Caemmerer, Susanne
影响因子：
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作者：
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通讯作者：
Von Caemmerer, Susanne
影响因子：
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作者：
Sugiura, Daisuke;Terashima, Ichiro;Evans, John R.
通讯作者：
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