Plasticity in maximum stomatal conductance constrained by negative correlation between stomatal size and density: an analysis using Eucalyptus globulus
Plasticity in maximum stomatal conductance constrained by negative correlation between stomatal size and density: an analysis using Eucalyptus globulus
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DOI：
10.1111/j.1365-3040.2009.02031.x
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发表时间：
2009-12-01
影响因子：
7.3
通讯作者：
Beerling, David J.
中科院分区：
文献类型：
--
作者：
Franks, Peter J.;Drake, Paul L.;Beerling, David J.
叶片成熟时气孔对水汽和CO2的最大导度(g（wmax), g(cmax)）主要由气孔大小(S)和气孔密度(D)决定。理论上，S和D的许多组合产生相同的g（wmax）和g(cmax)，因此S与D之间以及S、D与最大气孔导度之间没有内在的相关性。然而，利用气体通过不同大小气孔扩散的基本方程，我们发现S和D之间的负相关带来了一些优势，包括g（wmax）和g（cmax）的可塑性，而表皮面积分配给气孔的变化最小。对高、低降雨条件下的蓝桉幼苗和小乔木幼苗S与D的关系分析表明，S与D呈较强的负相关关系，S随D的增加呈负幂函数递减。结果表明，最大气孔导度的可塑性可能受到S - D负关系的制约，最大气孔导度越大，S越小，D越高，随着S和D的变化，表皮空间分配给气孔的变化倾向于最小化。
Maximum stomatal conductance to water vapour and CO2 (g(wmax), g(cmax), respectively), which are set at the time of leaf maturity, are determined predominantly by stomatal size (S) and density (D). In theory, many combinations of S and D yield the same g(wmax) and g(cmax), so there is no inherent correlation between S and D, or between S, D and maximum stomatal conductance. However, using basic equations for gas diffusion through stomata of different sizes, we show that a negative correlation between S and D offers several advantages, including plasticity in g(wmax) and g(cmax) with minimal change in epidermal area allocation to stomata. Examination of the relationship between S and D in Eucalyptus globulus seedlings and coppice shoots growing in the field under high and low rainfall revealed a strong negative relationship between S and D, whereby S decreased with increasing D according to a negative power function. The results provide evidence that plasticity in maximum stomatal conductance may be constrained by a negative S versus D relationship, with higher maximum stomatal conductance characterized by smaller S and higher D, and a tendency to minimize change in epidermal space allocation to stomata as S and D vary.