The Physiological Mechanisms Behind the Earlywood-To-Latewood Transition: A Process-Based Modeling Approach.
The Physiological Mechanisms Behind the Earlywood-To-Latewood Transition: A Process-Based Modeling Approach.
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DOI：
10.3389/fpls.2018.01053
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发表时间：
2018
影响因子：
5.6
通讯作者：
Giannino F
中科院分区：
文献类型：
--
作者：
Cartenì F;Deslauriers A;Rossi S;Morin H;De Micco V;Mazzoleni S;Giannino F
在热带以外的生态系统中，树木的生长是循环的，产生由大腔薄壁细胞（早材）和窄腔厚壁细胞（晚材）交替组成的树木年轮。到目前为止，木材形成过程背后的生理学和相关的动力学很少被认为是解释这种模式。我们开发了一个基于过程的机制模型，模拟针叶树管胞的发展，明确考虑细胞扩大和细胞壁的沉积和木质化的过程。该模型假设：（1）细胞壁的沉积逐渐减缓细胞的扩大，（2）纤维素和木质素的沉积是由可溶性糖的可用性。该模型可靠地再现了四种针叶树管胞的解剖特征和动力学。在生长季节开始时，形成层中的低糖可用性导致缓慢的壁沉积，这允许更长的扩大时间;因此，具有薄壁的大细胞（即，早期的木材）生产。在夏末和初秋，高糖可利用性产生具有厚细胞壁的较窄细胞（即，latewood）。这个模型框架提供了植物生理生态学和木材物候学之间的机制联系，并显着有助于了解在木质部发育过程中的糖的可用性的作用。
In extratropical ecosystems, the growth of trees is cyclic, producing tree rings composed of large-lumen and thin-walled cells (earlywood) alternating with narrow-lumen and thick-walled cells (latewood). So far, the physiology behind wood formation processes and the associated kinetics has rarely been considered to explain this pattern. We developed a process-based mechanistic model that simulates the development of conifer tracheids, explicitly considering the processes of cell enlargement and the deposition and lignification of cell walls. The model assumes that (1) wall deposition gradually slows down cell enlargement and (2) the deposition of cellulose and lignin is regulated by the availability of soluble sugars. The model reliably reproduces the anatomical traits and kinetics of the tracheids of four conifer species. At the beginning of the growing season, low sugar availability in the cambium results in slow wall deposition that allows for a longer enlargement time; thus, large cells with thin walls (i.e., earlywood) are produced. In late summer and early autumn, high sugar availability produces narrower cells having thick cell walls (i.e., latewood). This modeling framework provides a mechanistic link between plant ecophysiology and wood phenology and significantly contributes to understanding the role of sugar availability during xylogenesis.
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影响因子：
6.9
作者：
Anfodillo T;Deslauriers A;Menardi R;Tedoldi L;Petit G;Rossi S
通讯作者：
Rossi S
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影响因子：
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作者：
Deslauriers, Annie;Huang, Jian-Guo;Rossi, Sergio
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影响因子：
3.8
作者：
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通讯作者：
Donaldson, LA
影响因子：
9.4
作者：
Cuny, Henri E.;Rathgeber, Cyrille B. K.;Fournier, Meriem
通讯作者：
Fournier, Meriem
影响因子：
2.2
作者：
Deslauriers, A;Morin, H;Begin, Y
通讯作者：
Begin, Y