Vessel diameter is related to amount and spatial arrangement of axial parenchyma in woody angiosperms.
Vessel diameter is related to amount and spatial arrangement of axial parenchyma in woody angiosperms.
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DOI：
10.1111/pce.13091
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
Hugh Morris;Mark A. F. Gillingham;L. Plavcová;S. Gleason;M. Olson;D. Coomes;E. Fichtler;Matthias M Klepsch;Hugo I. Martínez-Cabrera;D. McGlinn;E. Wheeler;Jingming Zheng;Kasia Ziemińska;S. Jansen
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文献类型：
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作者：
Hugh Morris;Mark A. F. Gillingham;L. Plavcová;S. Gleason;M. Olson;D. Coomes;E. Fichtler;Matthias M Klepsch;Hugo I. Martínez-Cabrera;D. McGlinn;E. Wheeler;Jingming Zheng;Kasia Ziemińska;S. Jansen
薄壁组织是木本被子植物次生木质部边材中非常重要的活组织。考虑到薄壁组织和水运输船只之间的各种相互作用，我们假设这两种细胞类型之间的结构-功能关系。通过广义加法混合模型方法的基础上来自文献的2,332木本被子植物种，我们探讨了射线和轴向薄壁组织和导管大小的比例和空间分布之间的关系，同时控制最大株高和一系列的气候因素。当考虑最大株高时，我们发现，随着年平均温度的升高，平均导管直径与轴向薄壁组织比例和排列呈正相关，但射线薄壁组织不相关。具有高轴向薄壁组织分数的物种倾向于具有宽的血管，大部分薄壁组织包裹在血管周围，而具有小直径血管的物种显示出不直接连接到血管的轴向薄壁组织的量减少。这一发现为大导管植物中轴薄壁组织和射线薄壁组织的独立功能提供了证据，并进一步支持了轴薄壁组织在长距离木质部水分运输中的重要作用。
Parenchyma represents a critically important living tissue in the sapwood of the secondary xylem of woody angiosperms. Considering various interactions between parenchyma and water transporting vessels, we hypothesize a structure-function relationship between both cell types. Through a generalized additive mixed model approach based on 2,332 woody angiosperm species derived from the literature, we explored the relationship between the proportion and spatial distribution of ray and axial parenchyma and vessel size, while controlling for maximum plant height and a range of climatic factors. When factoring in maximum plant height, we found that with increasing mean annual temperatures, mean vessel diameter showed a positive correlation with axial parenchyma proportion and arrangement, but not for ray parenchyma. Species with a high axial parenchyma tissue fraction tend to have wide vessels, with most of the parenchyma packed around vessels, whereas species with small diameter vessels show a reduced amount of axial parenchyma that is not directly connected to vessels. This finding provides evidence for independent functions of axial parenchyma and ray parenchyma in large vesselled species and further supports a strong role for axial parenchyma in long-distance xylem water transport.