Leaf acclimation to light availability supports rapid growth in tall Picea sitchensis trees
Leaf acclimation to light availability supports rapid growth in tall Picea sitchensis trees
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叶子对光照的适应支持高大云杉树的快速生长
DOI：
10.1093/treephys/tpx027
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发表时间：
2017
期刊：
影响因子：
4
通讯作者：
S. C. Sillett
中科院分区：
文献类型：
--
作者：
A. Chin;S. C. Sillett
在高大的树冠中，叶级解剖学变化很明显，但水和光的可用性在控制这种变化方面的相对重要性仍不清楚。西加云杉 (Picea satchensis, (Bong.) Carr.) 在太平洋西北部的温带雨林中繁衍生息，历史上它的高度可达 100 m 以上，尽管很少与年龄五倍的红杉一起生活超过 400 年。我们结合横向切片、纵向切片、表皮印记和全叶测量来检查高达 97 m 的树木的叶子，以探索水分胁迫和光照对锡钦松叶子发育的综合影响。与高大柏科植物的情况相反，光的可用性（而不是水力限制）是锡钦柏叶水平解剖变异的主要生态驱动因素。虽然与高度相关的叶长和中孔率的降低最好是通过叶片伸长的静水力限制来解释的，但我们测量的大多数解剖特征反映了对光可用性的适应，包括叶宽和树冠最亮部分的维管组织面积的增加。随着这些变化，明亮的上冠中远轴气孔的出现，以及单列横向板中叶肉的排列（具有径向排列的质外体路径，在用 V 形细胞桥接气孔之前直接通向气孔）可能会增强气体交换和水力传导性。这套叶子特征表明了一种适应性策略，以牺牲耐水性为代价来最大化光合作用。跨越高树冠高度梯度的解剖学研究建立了我们对物种间生长速度、寿命和对气候变化的潜在反应的潜在机制的理解。
Leaf-level anatomical variation is readily apparent within tall tree crowns, yet the relative importance of water and light availability in controlling this variation remains unclear. Sitka spruce (Picea sitchensis, (Bong.) Carr.) thrives in temperate rainforests of the Pacific Northwest, where it has historically reached heights >100 m, despite rarely living more than 400 years alongside redwoods that are five times older. We examined leaves of trees up to 97 m tall using a combination of transverse sections, longitudinal sections, epidermal imprints and whole-leaf measurements to explore the combined effects of water stress and light availability on leaf development in P. sitchensis. In contrast to the situation in tall Cupressaceae, light availability-not hydraulic limitation-is the primary ecological driver of leaf-level anatomical variation in P. sitchensis. While height-associated decreases in leaf length and mesoporosity are best explained by hydrostatic constraints on leaf elongation, the majority of anatomical traits we measured reflect acclimation to light availability, including increases in leaf width and vascular tissue areas in the brightest parts of the crown. Along with these changes, the appearance of abaxial stomata in the bright upper crown, and the arrangement of mesophyll in uniseriate, transverse plates-with radially arranged apoplastic pathways leading directly to stomata before bridging them with a V-shaped cell-may enhance gas exchange and hydraulic conductivity. This suite of leaf traits suggests an adaptive strategy that maximizes photosynthesis at the expense of water-stress tolerance. Anatomical investigations spanning the height gradient in tall tree crowns build our understanding of mechanisms underlying among-species variation in growth rates, life spans, and potential responses to climate change.
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影响因子：
2.7
作者：
R. Oguchi;R. Oguchi;K. Hikosaka;T. Hiura;T. Hirose
通讯作者：
R. Oguchi;R. Oguchi;K. Hikosaka;T. Hiura;T. Hirose
马来西亚低地热带雨林树种同压和异压叶的生态分布。
DOI：
--
发表时间：
2007
期刊：
American Jouranal of Botany 94(5)
影响因子：
--
作者：
Kezno;T.;Ichie;T.;Watanabe;Y. and Hiromi;T.
通讯作者：
T.
影响因子：
3.7
作者：
I. Terashima
通讯作者：
I. Terashima
影响因子：
2.7
作者：
Y. Inoue;Y. Inoue;T. Kenzo;Ayumi Tanaka‐Oda;Aogu Yoneyama;T. Ichie
通讯作者：
Y. Inoue;Y. Inoue;T. Kenzo;Ayumi Tanaka‐Oda;Aogu Yoneyama;T. Ichie
影响因子：
2.9
作者：
KING, DA
通讯作者：
KING, DA